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2. The first Miocene fossils from coastal woodlands in the southern East African Rift

Author

Bobe, René, Aldeias, Vera, Alemseged, Zeresenay, Anemone, Robert L., Archer, Will, Aumaître, Georges, Bamford, Marion K., Biro, Dora, Bourlès, Didier L., Doyle Boyd, Melissa, Braun, David R., Capelli, Cristian, d’Oliveira Coelho, João, Habermann, Jörg M., Head, Jason J., Keddadouche, Karim, Kupczik, Kornelius, Lebatard, Anne-Elisabeth, Lüdecke, Tina, Macôa, Amélia, Martínez, Felipe I., Mathe, Jacinto, Mendes, Clara, Paulo, Luis Meira, Pinto, Maria, Presnyakova, Darya, Püschel, Thomas A., Regala, Frederico Tátá, Sier, Mark, Ferreira da Silva, Maria Joana, Stalmans, Marc, and Carvalho, Susana

Published
2023
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4. Late Glacial deglaciation of the Zackenberg area, NE Greenland

Author

Aumaître, Georges, Bourlès, Didier, Keddadouche, Karim, Garcia-Oteyza, J., Oliva, M., Palacios, D., Fernández-Fernández, J.M., Schimmelpfennig, I., Andrés, N., Antoniades, D., Christiansen, H.H., Humlum, O., Léanni, L., Jomelli, V., Ruiz-Fernández, J., Rinterknecht, V., Lane, T.P., and Adamson, K.

Published
2022
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9. Chronostratigraphy, depositional patterns and climatic imprints in Lake Acigöl (SW Anatolia) during the Quaternary

Author

Aumaître, Georges, Keddadouche, Karim, Demory, François, Rambeau, Claire, Lebatard, Anne-Elisabeth, Perrin, Mireille, Blawal, Syed, Andrieu-Ponel, Valérie, Rochette, Pierre, Alçiçek, Hülya, Boulbes, Nicolas, Bourlès, Didier, Helvaci, Cahit, Petschick, Rainer, Mayda, Serdar, Moigne, Anne-Marie, Nomade, Sébastien, Ponel, Philippe, Vialet, Amélie, and Alçiçek, Mehmet Cihat

Published
2020
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14. Carbonate and silicate intercomparison materials for cosmogenic 36Cl measurements

Author

Mechernich, Silke, Dunai, Tibor J., Binnie, Steven A., Goral, Tomasz, Heinze, Stefan, Dewald, Alfred, Schimmelpfennig, Irene, Keddadouche, Karim, Aumaître, Georges, Bourlès, Didier, Marrero, Shasta, Wilcken, Klaus, Simon, Krista, Fink, David, Phillips, Fred M., Caffee, Marc W., Gregory, Laura C., Phillips, Richard, Freeman, Stewart P.H.T., Shanks, Richard, Akif Sarıkaya, M., Pavetich, Stefan, Rugel, Georg, Merchel, Silke, Akçar, Naki, Yesilyurt, Serdar, Ivy-Ochs, Susan, and Vockenhuber, Christof

Published
2019
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27. Denudation and weathering rates of carbonate lithologies from meteoric 10Be/9Be ratios

Author

Wittmann, Hella, Bouchez, Julien, Calmels, Damien, Gaillardet, Jerome, Frick, Daniel, Stroncik, Nicole, Aumaître, Georges, Bourlès, Didier, Keddadouche, Karim, and von Blanckenburg, Friedhelm

Abstract

During the past decades, cosmogenic nuclides, such as in-situ produced 10Be, evolved as state-of-the-art tool to quantify millennial-scale denudation in quartz-rich landscapes. However, applications of cosmogenic nuclides to carbonate-dominated lithologies are still rare, even though carbonate dissolution is a major weathering process that may compensate anthropogenically elevated CO2 levels over centennial-millennial timescales. Recent advances in quantifying carbonate erosion have been made using cosmogenic 36Cl and of carbonate weathering using dissolved loads (e.g.[1],[2]). As these integrate over two distinct time-scales we developed a method that records such rates simultaneously: the cosmogenic meteoric 10Be over 9Be ratio (10Be/9Be). We adapted a framework[3] combining a known atmospheric flux tracer, meteoric 10Be (T1/2=1.4 My), with stable 9Be, a trace released from rocks by weathering, to the limestone-dominated French Jura Mountains. We analyzed water, soil, sediment, and bedrock for 10Be/9Be, major/trace elements, and Sr and C isotopes, to quantify i) Be contribution from carbonate vs. silicate minerals and ii) from primary vs. secondary carbonate phases, iii) solid-solute load partitioning, and iv) deep (sediment) vs. surficial (soils) weathering and erosion. Our results indicate average denudation rates of 300 t/km2/yr, denudation being dominated by weathering flux (W/D ratios of 0.7-0.97), and a consistently higher contribution from deep weathering. These rates agree to decadal-scale denudation rates from combined suspended and dissolved fluxes within < 2x which highlights the great potential of this method for future Earth’s surface studies. [1]Ott et al., JGR-ES, 2019. [2]Ben-Asher et al., GSA-Bull., 2021. [3]von Blanckenburg, F, Bouchez, J. and Wittmann, H., EPSL, 2012.

Published
2022
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28. Eolian chronology reveals causal links between tectonics, climate, and erg generation

Author

Vainer, Shlomy, Matmon, Ari, Ben Dor, Yoav, Verrecchia, Eric P., Eckardt, Frank, Aumaitre, Georges, Bourles, Didier, Keddadouche, Karim, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), The Hebrew University of Jerusalem (HUJ), Geological Survey of Israel (GSI), Geological Survey of Israel, Université de Lausanne = University of Lausanne (UNIL), and University of Cape Town

Subjects
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology
Abstract

International audience; Evaluating the impact and implications of eolian repositories that mark large-scale climatic transitions requires knowledge about the timing of their emplacement and the mechanisms responsible for their production, which remain highly uncertain. Here we apply numerical modeling of cosmogenic nuclide data, measured in the largest continuous terrestrial body of sand on Earth, to determine settings under which the sand was generated, by constraining the timing of sand introduction into the interior of southern Africa. Our findings reveal that major events of sand formation and accumulation in the Kalahari Basin occurred between ~2.2 and 1 Myr ago. The establishment of the Kalahari sand field corresponds to regional, continental, and global scale morphotectonic and climatic changes that contributed to the mass production and widespread dispersion of sand. These changes substantially altered existing habitats, thus constituting a crucial milestone for flora, fauna, and hominins in southern Africa during the Pleistocene.

Published
2022

29. LAKE PANNON TRANSGRESSION ON THE WESTERNMOST TIP OF THE CARPATHIANS CONSTRAINED BY BIOSTRATIGRAPHY AND AUTHIGENIC 10BE/9BE DATING (CENTRAL EUROPE)

Author

Sujan, Michal, Braucher, Regis, Mandic, Oleg, Fordinal, Klement, Brixova, Bibiana, Pipik, Radovan Kyska, Simo, Vladimir, Jamrich, Michal, Rybar, Samuel, Kluciar, Tomas, Ruman, Andrej, Zvara, Ivan, Kovac, Michal, Aumaitre, Georges, Bourles, Didier L., Keddadouche, Karim, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and Beaussier, Catherine

Subjects
QE1-996.5, [SDU.STU] Sciences of the Universe [physics]/Earth Sciences, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Paleontology, Geology, Late Miocene, Pannonian Basin System, facies analysis, shoal water delta, cosmogenic nuclide, paleogeography, QE701-760, ComputingMilieux_MISCELLANEOUS
Abstract

The depocenters of epicontinental basins usually comprise relatively continuous depositional records, and these can be used in the determination of sediment routing and paleogeographic changes via a set of various geophysical, sedimentological, biostratigraphic and geochronological approaches. Although the margins of such basins will have a major role as constraints for that sediment routing, their depositional records are typically scarce and incomplete, posing a common challenge in terms of gaining information about them. The present study focuses on the upper Miocene succession present in the Malé Karpaty Mts., a pre-Cenozoic horst dividing the Vienna and Danube basins (Central Europe). The data gained by facies analysis, biostratigraphy, shallow seismic survey, authigenic 10Be/9Be dating and correlation of archival borehole profiles reveals, that the succession under consideration represents a record of the Lake Pannon transgression, which appeared in the study area at ~10.9–10.6 Ma. The subaerially exposed granitic massif and Middle Miocene successions sourced a shoal water delta, which intercalated with wave-induced dunes and open lacustrine muds in brackish sublittoral to marginal littoral environments. The granitic massif was probably also exposed later, during the regression of Lake Pannon at ~10.2–10.0 Ma, as a result of the progradation of the paleo-Danube delta from the Vienna Basin southeastwards. The depositional record of the regressive sequence was documented and dated in well-cores from the nearby Danube Basin margin. The documented scenario of transgression preceding the overall regression of the paleo-Danube delta system by a relatively short period is characteristic of several other localities across the Pannonian Basin System, and may imply that the progradation of depositional system caused a base-level rise on account of sediment loading-induced subsidence., RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA , V. 127 N. 3 (2021)

Published
2021
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30. Book of Abstracts - vDEUQUA2021

Author

Abadi, Mehrdad, Abbasi, Hamidreza, Abd El-Raouf, Amr, Abdulkarim, Mubarak, Adolph, Marie-Luise, Aeschbach, Werner, Akçar, Naki, Amini, Hamideh, Andreev, Andrej, Anselmetti, Flavio S., Aumaître, Georges, Avendaño Villeda, Diana, Bartz, Melanie, Baumhauer, Roland, Bazarradnaa, Enkhtuya, Bebiolka, Anke, Behling, Hermann, Benkaddour, Abdelfattah, Binot, Franz, Birlo, Stella, Bittner, Lucas, Bliedtner, Marcel, Bolland, Alexander, Bork, Hans-Rudolf, Bouaziz, Moncef, Bourlès, Didier, Brauer, Achim, Breuer, Sonja, Bromm, Tobias, Buechi, Marius W., Burghardt, Diana, Busch, Robert, Caballero, Margarita, Carr, Andrew S., Chapkanski, Stoil, Christl, Marcus, Cosac, Marian, Dal Corso, Marta, Daniel, Thomas, Dar, Reyaz, Dave, Aditi Krishna, De Jonge, Cindy, Deplazes, Gaudenz, Dietze, Elisabeth, Dietze, Michael, Dietzel, Martin, Dreibrodt, Stefan, Drysdale, Russell, du Plessis, Nadia, Dubois, Nathalie, Duller, Geoff, Duttmann, Rainer, Duval, Mathieu, Döhlert-Albani, Norman, Egli, Markus, Einwögerer, Thomas, Elbracht, Jörg, Enters, Dirk, Enzel, Yehouda, Ertlen, Damien, Farkas, Beáta, Fattahi, Morteza, Faust, Dominik, Faybishenko, Boris, Feistmantl, Nina, Fernandez, Philippe, Ferrier, Catherine, Fiedler, Sabine, Fischer, Birgit, Fischer, Peter, Fitzsimmons, Kathryn, Fletcher, William, Frechen, Manfred, Fuchs, Margret C., Fuchs, Markus, Fuelling, Alexander, Fábián, Szabolcs, Fülling, Alexander, Garbe, Philipp, Gebhardt, Catalina, Gegg, Lukas, Geis, Anna-Lena, Geitner, Clemens, Ghanbarian, Behzad, Gianotti, Franco, Gil Romera, Graciela, Glaser, Bruno, Glückler, Ramesh, Gresina, Fruzsina, Grootes, Pieter Meiert, Guadelli, Aleta, Guadelli, Jean-Luc, Guérin, Guillaume, Haas, Jean Nicolas, Haberzettl, Torsten, Hambach, Ulrich, Hardt, Jacob, Hein, Michael, Heinrich, Hartmut, Heinrich, Susann, Herzschuh, Ulrike, Heydari, Maryam, Hildebrandt, Dominic, Hirschmann, Philip, Hofmann, Felix Martin, Hofmann, Robert, Hogrefe, Ines, Huang, Jyh-Jaan Steven, Hunt, Allen, Händel, Marc, Ivy-Ochs, Susan, Jary, Zdzisław, Jeanneret, Pilar, Jöris, Olaf, Kalicki, Tomasz, Kamleitner, Sarah, Karaschewski, Jasmin, Keddadouche, Karim, Kehl, Martin, Kern, Zoltán, Kertscher, Cathleen, Khatooni, Darvish, Khosravichenar, Azra, Kipfer, Rolf, Kirchner, André, Kirleis, Wiebke, Klaes, Björn, Knitter, Daniel, Kolb, Thomas, Konstantinovski Puntos, Cyryl, Kreienbrink, Frauke, Kreutzer, Sebastian, Kulongoski, Justin, Laag, Christian, Labahn, Jakob, Lachner, Johannes, Lak, Razyeh, Lamb, Henry F., Lampe, Reinhard, Lang, Jörg, Lange-Athinodorou, Eva, Lauer, Tobias, Leanni, Laetitia, Leblanc, Jean-Claude, Lee, An-Sheng, Lehmkuhl, Frank, Lempe, Bernhard, Lerch, Marcel, Liou, Sofia Ya Hsuan, Lisa, Lenka, Liu, Zuorui, Lomax, Johanna, Lorenz, Sebastian, Lozano García, Socorro, Madarász, Balázs, Madritsch, Herfried, Maier, Andreas, Mangelsdorf, Kai, Markovic, Slobodan, Martinez Abarca, Luis Rodrigo, Marx, Samuel, May, Jan-Hendrik, Mayr, Christoph, Meister, Julia, Merchel, Silke, Meszner, Sascha, Meyer, Juliane, Mikdad, Abdeslam, Milevski, Ivica, Mir, Jehangeer, Mischke, Steffen, Mohammadi, Ali, Monegato, Giovanni, Moreiras, Stella, Mueller, Daniela, Muratoreanu, George, Müller, Daniela, Müller, Johannes, Nadeau, Marie-Josée, Nett, Janina, Neugebauer, Ina, Ng, Jessica, Nill, Leon, Nir, Nadav, Ohlendorf, Christian, Opp, Christian, Orgeira, Maria, Ortega Guerrero, Beatriz, Pasda, Clemens, Pasda, Kerstin, Penkman, Kirsty, Peric, Zoran, Pichat, Sylvain, Piller, Werner, Polgar, Irene, Prendergast, Amy, Preusser, Frank, Prud'homme, Charlotte, Pötter, Stephan, Quick, Lynne J., Rambeau, Claire, Reichert, Markus, Reimann, Tony, Reiss, Lilian, Roettig, Christopher-Bastian, Rolf, Christian, Russell, James, Ruszkiczay-Rüdiger, Zsófia, Ryzner, Kamila, Sahakyan, Lilit, Salazar, Gary, Salomon, Ferréol, Sardar Abadi, Mehrdad, Sarı, Selma, Scardia, Giancarlo, Schiestl, Robert, Schimmelpfennig, Irene, Schirmer, Wolfgang, Schmidt, Christoph, Schmidt, Johannes, Schmitt, Laurent, Schneider, Birgit, Schulte, Philipp, Schulze, Tabea, Schunke, Torsten, Schwab, Markus J., Schwahn, Lea, Schwamborn, Georg, Schwark, Lorenz, Schäfer, Dieter, Schütt, Brigitta, Seltzer, Alan, Selzer, Johnnes, Severinghaus, Jeffrey, Shah, Rayees, Simon, Ulrich, Sirakov, Nikolay, Sirakova, Svoboda, Sontag-González, Mariana, Sprafke, Tobias, Stahlschmidt, Mareike, Stauber, Theresa, Steier, Peter, Steiner, Martin, Stojakowits, Philipp, Strobel, Paul, Stroessner, Kathrin, Struck, Julian, Stute, Martin, Stutzriemer, Marika, Stäuble, Harald, Szidat, Sönke, Taneva, Stanimira, Tanner, David, ASTER, Team, Temovski, Marjan, Tinapp, Christian, Tjallingii, Rik, Trappe, Julian, Tylmann, Wojciech, Ulfers, Arne, Ullmann, Tobias, Urban, Brigitte, van Meer, Mike, Varga, György, Veres, Daniel, Verstraeten, Gert, Videiko, Michail, Vinnepand, Mathias, Vockenhuber, Christof, Vogel, Hendrik, Voigt, Silke, von Suchodoletz, Hans, Vött, Andreas, Weiß, Marcel, Werther, Lukas, Wolf, Daniel, Wonik, Thomas, Wrozyna, Claudia, Wunderlich, Tina, Zech, Michael, Zech, Roland, Zeeden, Christian, Zielhofer, Christoph, Zolitschka, Bernd, Zöller, Ludwig, Żurek, Krzysztof, von Suchodoletz, Hans, Dietze, Elisabeth, Dietze, Michael, Meister, Julia, Wrozyna, Claudia, Zeeden, Christian, Kreutzer, Sebastian, and Hildebrandt, Dominic

Subjects
Quaternary, Conference abstracts, Geoscience
Abstract

Collection of conference abstracts presented at the vDEUQUA2021 (2021-09-30 to 2021-09-01), the virtual meeting of the German Quaternary Association (DEUQUA).

Published
2021
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31. Javanese Homo erectus on the move in SE Asia circa 1.8 Ma.

Author

Husson, Laurent, Salles, Tristan, Lebatard, Anne-Elisabeth, Zerathe, Swann, Braucher, Régis, Noerwidi, Sofwan, Aribowo, Sonny, Mallard, Claire, Carcaillet, Julien, Natawidjaja, Danny H., Bourlès, Didier, ASTER team, Aumaitre, Georges, and Keddadouche, Karim

Subjects
COSMOGENIC nuclides, FOSSIL hominids, HOMO erectus, HUMAN evolution, PLEISTOCENE Epoch, HOMINIDS, ARCHIPELAGOES
Abstract

The migration of Homo erectus in Southeast Asia during Early Pleistocene is cardinal to our comprehension of the evolution of the genus Homo. However, the limited consideration of the rapidly changing physical environment, together with controversial datings of hominin bearing sites, make it challenging to secure the robust timeline needed to unveil the behavior of early humans. Here, we reappraise the first appearance datum of Javanese H. erectus by adding the most reliable age constraints based on cosmogenic nuclides 10 Be and 26 Al produced in situ to a compilation of earlier estimates. We find that H. erectus reached Java and dwelled at Sangiran, Java, ca. 1.8 Ma. Using this age as a baseline, we develop a probabilistic approach to reconstruct their dispersal routes, coupling ecological movement simulations to landscape evolution models forced by reconstructed geodynamic and climatic histories. We demonstrate that the hospitable terra firma conditions of Sundaland facilitated the prior dispersal of hominins to the edge of Java, where they conversely could not settle until the Javanese archipelago emerged from the sea and connected to Sundaland. The dispersal of H. erectus across Sundaland occurred over at least tens to hundreds kyr, a time scale over which changes in their physical environment, whether climatic or physiographic, may have become primary forcings on their behavior. Our comprehensive reconstruction method to unravel the peopling timeline of SE Asia provides a novel framework to evaluate the evolution of early humans. [ABSTRACT FROM AUTHOR]

Published
2022
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32. WITHDRAWN: Didier L. Bourlès (1955–2021), the 5 MV cosmogenic rock star…

Author

Braucher, Régis, Blard, Pierre-Henri, Brown, Erik T., Carcaillet, Julien, Lebatard, Anne-Elisabeth, Siame, Lionel, Simon, Quentin, Thouveny, Nicolas, Aumaître, Georges, Carretier, Sébastien, Cornu, Sophie, Godard, Vincent, Fink, David, Finkel, Robert, German, Chris, Hamelin, Bruno, Hofmann, Felix Martin, Jomelli, Vincent, Keddadouche, Karim, Kurz, Mark D., Palacios, David, Measures, Chris, Merchel, Silke, Regard, Vincent, Schimmelpfennig, Irene, von Blanckenburg, Friedhelm, and Zerathe, Swann

Published
2021
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33. Didier L. Bourlès (1955–2021), the 5 MV cosmogenic rock star

Author

Braucher, Régis, Blard, Pierre-Henri, Brown, Erik T., Carcaillet, Julien, Lebatard, Anne-Elisabeth, Siame, Lionel, Simon, Quentin, Thouveny, Nicolas, Aumaître, Georges, Bard, Edouard, Carretier, Sébastien, Cornu, Sophie, Fink, David, Finkel, Robert, German, Chris, Godard, Vincent, Gosse, John, Hamelin, Bruno, Hofmann, Felix Martin, Jomelli, Vincent, Keddadouche, Karim, Kurz, Mark D., Matmon, Ari, Palacios, David, Measures, Chris, Merchel, Silke, Regard, Vincent, Schimmelpfennig, Irene, Von Blanckenburg, Friedhelm, and Zerathe, Swann

Published
2021
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34. Evolution of a debris-covered glacier in the Kerguelen Archipelago (49°S, 69°E) over the past 15,000 years constrained by in situ cosmogenic 36Cl dating

Author

Jomelli, Vincent, Charton, Joanna, Schimmelpfennig, Irene, Verfaillie, Deborah, Favier, Vincent, Mokadem, Fatima, Gilbert, Adrien, Brun, Fanny, Aumaître, Georges, Bourlès, Didier, Keddadouche, Karim, ASTER, Team, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Earth and Life Institute [Louvain-La-Neuve] (ELI), Université Catholique de Louvain = Catholic University of Louvain (UCL), Institut des Géosciences de l’Environnement (IGE), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP), Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Plateforme de géochimie isotopique ASTER-CEREGE, and Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
[SDU]Sciences of the Universe [physics], [SDE]Environmental Sciences
Abstract

International audience; Debris-covered glaciers constitute a substantial part of the worldwide cryosphere (Scherler et al.2018). However, their long-term response to multi-millennial climate variability has rarely been studied, in particular in the Southern Hemisphere. The presence of both debris-covered and debris-free glaciers on Kerguelen Archipelago (49°S, 69°E) offers therefore an excellent opportunity to investigate and compare long-term evolution of these two types of glaciers. To do so, we used the cosmogenic 36Cl surface dating method on moraine boulders that allows to establish temporal constraints of glacier oscillation. We provide here the first Late Glacial and Holocene glacier chronology of a still active debris-covered glacier from the archipelago: the Gentil Glacier. Results show that the Gentil Glacier advanced once at ~14.3 ka, i.e. during the Late Glacial (19.0 – 11.6 ka), and re-advanced during the Late Holocene at ~2.6 ka (Charton et al., 2020). Both debris-covered and debris-free glaciers experienced a broadly synchronous advance during the Late Glacial, that may be assigned to the Antarctic Cold Reversal event (14.5 – 12.9 ka) (Jomelli et al., 2017; 2018). This suggests that both types (debris-covered and debris-free) of glaciers at Kerguelen were sensitive to large amplitude temperature fluctuations recorded in Antarctic ice cores (WAIS divide Project Members, 2013), associated with increased precipitations (Van der Putten, 2015). However, during the Late Holocene, the advance at about ~2.6 ka was not observed on other glaciers and seems to be a specific response of the debris-covered Gentil Glacier, either related to distinct ice dynamics or an individual response to precipitation changes

Published
2021

35. Millennial‐scale deglaciation across the European Alps at the transition between the Younger Dryas and the Early Holocene - evidence from a new cosmogenic nuclide chronology

Author

Protin, Marie, Schimmelpfennig, Irene, Mugnier, Jean‐louis, Buoncristiani, Jean‐François, Le Roy, Melaine, Pohl, Benjamin, Moreau, Luc, Aumaitre, Georges, Bourlès, Didier, Keddadouche, Karim, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre de Recherches Pétrographiques et Géochimiques (CRPG), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA), Biogéosciences [UMR 6282] [Dijon] (BGS), Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Institute for Environmental Sciences [Geneva] (ISE), University of Geneva [Switzerland], Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), ANR-14-CE03-0006,VIP-Mont-Blanc,VItesses des Processus contrôlant les évolutions morphologiques et environnementales du massif du Mont Blanc(2014), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Biogéosciences [UMR 6282] (BGS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), Université de Genève = University of Geneva (UNIGE), and Environnements, Dynamiques et Territoires de Montagne (EDYTEM)

Subjects
010506 paleontology, Archeology, geography, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Climate change, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Geology, Glacier, 01 natural sciences, 13. Climate action, Moraine, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, Deglaciation, Physical geography, Younger Dryas, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology, Cosmogenic nuclide, Ecology, Evolution, Behavior and Systematics, Holocene, 0105 earth and related environmental sciences, Teleconnection
Abstract

15 pages; International audience; Reconstructing the spatial and temporal response of mountain glaciers to rapid climate change in the past provides access to the effects of current climate change. Yet, the spatial and temporal variability of past glacier fluctuations is not fully understood. In this study, we focus on the timing of glacier fluctuations in the European Alps during the Younger Dryas/Early Holocene (YD/EH) transition. In an effort to elucidate whether glacier fluctuations were synchronous during this period, we present a new chronology of the Alpine Talèfre glacier, based on 14 new 10Be ages of moraines and roches moutonnées. The retreat of Talèfre glacier was initiated during the mid-YD (~12.4 ka), then it experienced a gradual retreat punctuated by at least three oscillations until ∼11 ka before shrinking substantially within its Little Ice Age limits (13th−19th centuries). Comparison of our findings with published glacier chronologies in the Alpine region highlights broadly synchronous behaviour of glaciers across the Alps between 12 and 10 ka. The coeval glacier fluctuations at a regional scale suggest that common regional climate conditions had a major impact on Alpine glacier variations during the YD/EH transition. The similarity of glacier behaviour and independent temperature records in both the Alpine region and the northern high latitudes suggests a teleconnection between these regions, but differences in the amplitude of the mean annual temperature signals relative to summer temperature indicate pronounced changes in seasonality between the YD and the EH.

Published
2021

39. Sediment sources and transport by the Kahiltna Glacier and other catchments along the south side of the Alaska Range, Alaska

Author

Matmon, A., Haeussler, P. J., Arnold, M., Bourlès, D.L., Aumaitre, Georges, KEDDADOUCHE, Karim, The Hebrew University of Jerusalem (HUJ), University of Alaska [Anchorage], Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), and Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)

Subjects
geography, geography.geographical_feature_category, Glacier terminus, 010504 meteorology & atmospheric sciences, Stratigraphy, Bedrock, Sediment, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Geology, Glacier, 15. Life on land, 010502 geochemistry & geophysics, Glacier morphology, 01 natural sciences, Moraine, Erosion, Glacial period, Geomorphology, 0105 earth and related environmental sciences
Abstract

Erosion related to glacial activity produces enormous amounts of sediment. However, sediment mobilization in glacial systems is extremely complex. Sediment is derived from headwalls, slopes along the margins of glaciers, and basal erosion; however, the rates and relative contributions of each are unknown. To test and quantify conceptual models for sediment generation and transport in a simple valley glacier system, we collected samples for 10Be analysis from the Kahiltna Glacier, which flows off Denali, the tallest mountain in North America. We collected angular quartz clasts on bedrock ledges from a high mountainside above the equilibrium line altitude (ELA), amalgamated clast samples from medial moraines, and sand samples from the river below the glacier. We also collected sand from nine other rivers along the south flank of the Alaska Range. In the upper catchment of the Kahiltna drainage system, toppling, rockfall, and slab collapse are significant erosional processes. Erosion rates of hundreds of millimeters per thousand years were calculated from 10Be concentrations. The 10Be concentrations in amalgamated samples from medial moraines showed concentrations much lower than those measured from the high mountainside, a result of the incorporation of thick, and effectively unexposed, blocks into the moraine, as well as the incorporation of material from lower-elevation nearby slopes above the moraines. The 10Be sediment samples from downstream of the Kahiltna Glacier terminus showed decreasing concentrations with increasing distance from the moraine, indicating the incorporation of material that was less exposed to cosmic rays, most likely from the glacier base as well as from slopes downstream of the glacier. Taken together, 10Be concentrations in various samples from the Kahiltna drainage system indicated erosion rates of hundreds of millimeters per thousand years, which is typical of tectonically active terrains. We also measured 10Be concentrations from river sediment samples collected from across the south flank of the Alaska Range. Calculation of basinwide weighted erosion rates that incorporated hypsometric curves produced unrealistically high erosion rates, which indicates that the major source of sediment was not exposed to cosmic rays and was primarily derived from the base of glaciers. Moreover, the apparently high erosion rates suggest that parts of each drainage system are not in erosional steady state with respect to cosmogenic isotope accumulation.

Published
2020

40. Late Cenozoic evolution of the Ariège River valley (Pyrenees) constrained by cosmogenic 26Al/10Be and 10Be/21Ne dating of cave sediments

Author

Sartégou, Amandine, Blard, Pierre‐Henri, BRAUCHER, Regis, Bourlès, Didier, Sorriaux, Patrick, Zimmermann, Laurent, Laffitte, Alexis, Tibari, Bouchaïb, Leanni, Laëtitia, Guillou, Valéry, Bourdet, Audry, Aumaitre, Georges, KEDDADOUCHE, Karim, Histoire naturelle de l'Homme préhistorique (HNHP), Muséum national d'Histoire naturelle (MNHN)-Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Centre de Recherches Pétrographiques et Géochimiques (CRPG), Université de Lorraine (UL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Glaciologie [Bruxelles], Université libre de Bruxelles (ULB), Géosciences Environnement Toulouse (GET), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), and RGF PyrénéesINSU

Subjects
Incision rates, Karst geomorphology, [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, 26Al, 10Be, Cosmogenic burial dating, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, 21Ne, Pyrenees, Cave deposits, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology
Abstract

International audience; Despite increasing knowledge on the orogenic phases of the Pyrenees, the Neogene evolution of the range remains poorly constrained. The central Pyrenees, particularly the Ariège River valley and its terrace systems and glacial extensions, are key to reconstructing Pyrenean evolution during the Neogene. However, few terrace relics remain on the piedmont edges. To overcome this limitation and temporally extend the dataset obtained from terraces, we focus on alluvium-filled horizontal epiphreatic passages developed in limestone karstic networks. These landforms record the transient position of former local base levels during the process of valley deepening, similar to fluvial terraces. The alluvium fills of the studied caves in the Tarascon-sur-Ariège area, in the transition zone between the upper range and the piedmont, therefore enable the reconstruction of the geodynamic evolution of the Ariège River valley. All studied caves are developed on at least eight levels. Based on burial durations determined by 26Al/10Be and 10Be/21Ne terrestrial cosmogenic nuclide dating of samples from epiphreatic levels, our results indicate Langhian to Messinian (~13–5 Ma) incision rates averaging 48 m Myr−1. However, the obtained record does not allow us to accurately retrace the Pliocene evolution of the area due to the lack of known caves at corresponding levels. Moreover, raised local base levels during glacial phases both make the record more complex and call into question the methodological approach in terms of potential internal sediment remobilization and mixing related to implied re-flooding periods.

Published
2020

41. Denudation systematics inferred from in situ cosmogenic Be-10 concentrations in fine (50-100 mu m) and medium (100-250 mu m) sediments of the Var River basin, southern French Alps

Author

Mariotti, Apolline, Blard, Pierre-henri, Charreau, Julien, Petit, Carole, Molliex, Stephane, Aumaitre, Georges, Bourles, Didier L., and Keddadouche, Karim

Abstract

Marine sedimentary archives are well dated and often span several glacial cycles; cosmogenic Be-10 concentrations in their detrital quartz grains could thus offer the opportunity to reconstruct a wealth of past denudation rates. However, these archives often comprise sediments much finer (< 250 mu m) than typically analyzed in Be-10 studies, and few studies have measured Be-10 concentrations in quartz grains smaller than 100 mu m or assessed the impacts of mixing, grain size, and interannual variability on the Be-10 concentrations of such fine-grained sediments. Here, we analyzed the in situ cosmogenic Be-10 concentrations of quartz grains in the 50-100 and 100-250 mu m size fractions of sediments from the Var basin (southern French Alps) to test the reliability of denudation rates derived from Be-10 analyses of fine sands. The Var basin has a short transfer zone and highly variable morphology, climate, and geology, and we test the impact of these parameters on the observed Be-10 concentrations. Both analyzed size fractions returned similar Be-10 concentrations in downstream locations, notably at the Var's outlet, where concentrations ranged from (4.02 +/- 0.78) x 10(4) to (4.40 +/- 0.64) x 10(4) atoms g(-1) of quartz. By comparing expected and observed Be-10 concentrations at three major river junctions, we interpret that sediment mixing is efficient throughout the Var basin. We resampled four key locations 1 year later, and despite variable climatic parameters during that period, interannual Be-10 concentrations were in agreement within uncertainties, except for one upper subbasin. The Be-10-derived denudation rates of Var subbasins range from 0.10 +/- 0.01 to 0.57 +/- 0.09 mm yr(-1), and spatial variations are primarily controlled by the average subbasin slope. The integrated denudation rate of the entire Var basin is 0.24 +/- 0.04 mm yr(-1), in agreement with other methods. Our results demonstrate that fine-grained sediments (50-250 mu m) may return accurate denudation rates and are thus potentially suitable targets for future Be-10 applications, such as studies of paleo-denudation rates using offshore sediments.

Published
2019

42. Late Miocene to Quaternary slip history across the Qiulitag anticline in the southern Tianshan piedmont

Author

Charreau, Julien, Sartégou, Amandine, Saint-Carlier, Dimitri, Lavé, Jérôme, Blard, Pierre-Henri, Dominguez, Stéphane, Wang, Sheng, Rao, Gang, Team, A.S.T.E.R., Aumaitre, Georges, Bourles, Didier, Keddadouche, Karim, Centre de Recherches Pétrographiques et Géochimiques (CRPG), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Géosciences Montpellier, Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Université des Antilles (UA)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), School of Environmental Science and Engineering [Nanjing University] (SESE - NUIST), Nanjing University of Information Science and Technology (NUIST), School of Earth Sciences [Hangzhou], Zhejiang University, Université de Lorraine (UL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA)

Subjects
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, 010504 meteorology & atmospheric sciences, Pleistocene, Anticline, Geology, Slip (materials science), Fold (geology), Late Miocene, Structural basin, 010502 geochemistry & geophysics, 01 natural sciences, Paleontology, Fluvial terrace, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, Quaternary, 0105 earth and related environmental sciences
Abstract

International audience; In this study, we reconstruct the Miocene to Quaternary shortening history across the Qiultag anticline, a complex fault-bend fold located in southern Tianshan. We studied the Yaha and Kuche sections, where we combined surface structural measurements and seismic imaging to model the stratigraphic horizons. The history of folding was reconstructed based on magnetostratigraphic analyses and eight cosmogenic burial ages in Kuche. Pleistocene deformation rates were also quantified in Yaha based on a deformed fluvial terrace that we dated to ~67 ka using a cosmogenic depth profile. Our results suggest that the fold grew at a mean slip rate of 0.9-1.3 mm/a in both sections but accelerated to ~2.5 mm/a during the Pleistocene in Kuche. These results support a migration of the deformation toward the basin during the Pleistocene and suggest that most of the present deformation of the Tianshan is accommodated across the external structures of the range.

Published
2019

43. Late Quaternary deglaciation of Prince William Sound, Alaska.

Author

Haeussler, Peter J., Matmon, Ari, Arnold, Maurice, Aumaître, Georges, Bourlès, Didier, and Keddadouche, Karim

Subjects
GLACIAL melting, ICE sheets, PRINCES, SEA level, AGE groups, GLACIAL landforms
Abstract

To understand the timing of deglaciation of the northernmost marine-terminating glaciers of the Cordilleran Ice Sheet (CIS), we obtained 26 10Be surface-exposure ages from glacially scoured bedrock surfaces in Prince William Sound (PWS), Alaska. We sampled six elevation transects between sea level and 620 m and spanning a distance of 14 to 70 km along ice flow paths. Most transect age–elevation patterns could not be explained by a simple model of thinning ice; the patterns provide evidence for lingering ice cover and possible inheritance. A reliable set of 20 ages ranges between 17.4 ± 2.0 and 11.6 ± 2.8 ka and indicates ice receded from northwestern PWS around 14.3 ± 1.6 ka, thinned at a rate of ~120–160 m/ka, and retreated from sea-level sites at 12.9 ± 1.1 ka at a rate of 20 m/yr. The retreat rate likely slowed as glaciers retreated into northern PWS. These results are consistent with the growing body of reported deglacial constraints on collapse of ice sheets along the Alaska margin indicating collapse of the CIS soon after 17 ka. These data are consistent with paleotemperature data indicating that a warming North Pacific Ocean caused catastrophic collapse of this part of the CIS. [ABSTRACT FROM AUTHOR]

Published
2022
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44. Maximum glacier extent of the Penultimate Glacial Cycle in the Upper Garonne Basin (Pyrenees): new chronological evidence.

Author

Fernandes, Marcelo, Oliva, Marc, Vieira, Gonçalo, Palacios, David, Fernández-Fernández, José María, Delmas, Magali, García-Oteyza, Julia, Schimmelpfennig, Irene, Ventura, Josep, ASTER Team, Aumaître, Georges, and Keddadouche, Karim

Subjects
GLACIERS, LAST Glacial Maximum, MORAINES
Abstract

The Upper Garonne Basin included the longest glacier in the Pyrenees during the Late Pleistocene. During major glacial advances, the Garonne palaeoglacier flowed northwards along ~ 80 km from peaks of the axial Pyrenees exceeding 2800–3000 m until the foreland of this mountain range at the Loures–Barousse–Barbazan basin (LBBb), at 420–440 m. Here, the palaeoglacier formed a terminal moraine complex that is examined in this work. Based on geomorphological observations and a 12-sample data set of 10Be Cosmic-Ray Exposure (CRE) ages, the timing of the maximum glacial extent was constrained as well as the onset of the deglaciation from the end of the Last Glacial Cycle (LGC). Chronological data shows evidence that the external moraines in this basin were abandoned by the ice at the end of the Penultimate Glacial Cycle (PGC) and the onset of the Eemian Interglacial, at ~ 129 ka. No evidence of subsequent glacial advances or standstills occurred during the LGC in this basin were found, as the few existing datable boulders provided in the internal moraine showed inconsistent ages, thus probably being affected by post-glacial processes. The terminal basin was already deglaciated during the global Last Glacial Maximum at 24–21 ka, as revealed by exposure ages of polished surfaces at the confluence of the Garonne-La Pique valleys, 13 km south of the entrance of the LBBb. This study introduces the first CRE ages in the Pyrenees for the glacial advance occurred during the PGC and provides also new evidence that glaciers had already significantly shrunk during the LGM. [ABSTRACT FROM AUTHOR]

Published
2021
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45. Climatic reconstruction for the Younger Dryas/Early Holocene transition and the Little Ice Age based on paleo-extents of Argentière glacier (French Alps)

Author

Protin, Marie, Schimmelpfennig, Irene, Mugnier, Jean‐louis, Ravanel, Ludovic, Le Roy, Melaine, Deline, Philip, Favier, Vincent, Buoncristiani, Jean-François, Aster, Team, Bourlès, Didier, Aumaitre, Georges, Keddadouche, Karim, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut des Sciences de la Terre (ISTerre), Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Gustave Eiffel-Université Grenoble Alpes (UGA), Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut des Géosciences de l’Environnement (IGE), Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Biogéosciences [UMR 6282] (BGS), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS), French National Research Agency (ANR) 14-CE03-0006 VIP Mont-Blanc Centre National de la Recherche Scientifique (CNRS) French National Research Agency (ANR) IRD, ANR-14-CE03-0006,VIP-Mont-Blanc,VItesses des Processus contrôlant les évolutions morphologiques et environnementales du massif du Mont Blanc(2014), ANR-10-EQPX-0024,ASTER-CEREGE,PLATEFORME DE GEOCHIMIE ISOTOPIQUE ASTER/CEREGE(2010), European Project: 312609,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2012-1-RTD,EUFAR2(2014), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Université Joseph Fourier - Grenoble 1 (UJF), Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Biogéosciences [UMR 6282] [Dijon] (BGS), Centre National de la Recherche Scientifique (CNRS)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, ANR-10-EQPX-0024/10-EQPX-0024,ASTER-CEREGE,PLATEFORME DE GEOCHIMIE ISOTOPIQUE ASTER/CEREGE(2010), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Recherche pour le Développement (IRD)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Centre National de la Recherche Scientifique (CNRS), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD), Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
010506 paleontology, Archeology, 010504 meteorology & atmospheric sciences, Climate change, Western Europe, 01 natural sciences, PDD modeling, Glaciation, Moraine dating, Paleoclimatology, Cosmogenic nuclides, Glacial period, Younger Dryas, [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology, Cosmogenic nuclide, French Alps, Ecology, Evolution, Behavior and Systematics, Holocene, 0105 earth and related environmental sciences, Global and Planetary Change, geography, geography.geographical_feature_category, Geology, Glacier, Glacier fluctuations, PDD modeling 1. Introduction, 13. Climate action, Moraine, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, Paleoclimate reconstruction, [SDU]Sciences of the Universe [physics], Physical geography
Abstract

15 pages; International audience; Investigation of Holocene extents of mountain glaciers along with the related naturally-driven climate conditions helps improve our understanding of glacier sensitivity to ongoing climate change. Here, we present the first Holocene glacial chronology in the Mont-Blanc massif (Argentière glacier) in the French Alps, based on 25 in situ-produced cosmogenic 10 Be dates of moraines and glacial bedrocks. The obtained ages from mapped sequences of moraines at three locations reveal that the glacier was retreating from its Lateglacial extent and oscillating several times between ~11.7 ka and ~10.4 ka, i.e. during the Younger Dryas/Early Holocene (YD/EH) transition, before substantially retreating at ~10.4 ka. Climate conditions corresponding to the past extents of Argentière glacier during the YD/EH transition (~ 11 ka) and the Little Ice Age (LIA) were modelled with two different approaches: by determining summer temperature differences from reconstructed ELA-rises and by using a Positive Degree Day (PDD) mass-balance model coupled with a dynamic ice flow model. The ELArise reconstructions yield a possible range of summer temperatures for the YD/EH transition that were cooler by between 3.0 and 4.8°C compared to the year 2008, depending on the choice of the ELA sensitivity to summer temperature. The results from the PDD model indicate temperatures cooler by ~3.6 to 5.5°C during the YD/EH transition than during the 1979-2002 period. For the LIA, our findings highlight that the role of local precipitation changes, superimposed on the dominant temperature signal, is important in the detailed evolution of the glacier. Overall, this study highlights the challenge that remains in accurately inferring paleoclimate conditions from past glacier extents.

Published
2019

46. Post‐Last Glacial Maximum glacier fluctuations in the southern Écrins massif (westernmost Alps): insights from 10 Be cosmic ray exposure dating

Author

Hofmann, Felix Martin, Alexanderson, Helena, Schoeneich, Philippe, Mertes, Jordan, Léanni, Laettitia, Aumaitre, Georges, Bourles, D.L., KEDDADOUCHE, Karim, University of Freiburg [Freiburg], Lund University [Lund], Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université Grenoble Alpes (UGA), and Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA)

Subjects
010506 paleontology, Archeology, YOUNGER DRYAS, EGESEN MORAINE, 010504 meteorology & atmospheric sciences, EQUILIBRIUM-LINE ALTITUDE, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, EUROPEAN ALPS, 01 natural sciences, Ice age, UPPER DURANCE CATCHMENT, FRENCH ALPS, SWISS ALPS, Younger Dryas, Stadial, FROM-MOTION PHOTOGRAMMETRY, Ecology, Evolution, Behavior and Systematics, Holocene, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, geography, geography.geographical_feature_category, COSMOGENIC NUCLIDES, Geology, Glacier, Last Glacial Maximum, Massif, 15. Life on land, CLIMATIC CHANGES, Moraine, Physical geography
Abstract

International audience; Only a few chronological constraints on Lateglacial and Early Holocene glacier variability in the westernmost Alps have hitherto been obtained. In this paper, moraines of two palaeoglaciers in the southern ecrins massif were mapped. The chronology of the stabilization of selected moraines was established through the use of Be-10 cosmic ray exposure (CRE) dating. The equilibrium line altitude (ELA) during moraine deposition was reconstructed assuming an accumulation area ratio (AAR) of 0.67. Ten pre-Little Ice Age (LIA) ice-marginal positions of the Rougnoux palaeoglacier were identified and seven of these have been dated. The Be-10 CRE age of a boulder on the lowermost sampled moraine indicates that the landform may have been first formed during a period of stable glaciers at around 16.2 +/- 1.7 ka (kiloyears before AD 2017) or that the sampled boulder experienced pre-exposure to secondary cosmic radiation. The moraine was re-occupied or, alternatively, shaped somewhat before 12.2 +/- 0.6 ka when the ELA was lowered by 230 m relative to the LIA ELA. At least six periods of stable ice margins occurred thereafter when the ELA was 220-160 m lower than during the LIA. The innermost dated moraine stabilized at or before 10.9 +/- 0.7 ka. Three Be-10 CRE ages from a moraine of the Prelles palaeoglacier indicate a period of stationary ice margins at or before 10.9 +/- 0.6 ka when the ELA was lowered by 160 m with respect to the end of the LIA. The presented Be-10 CRE ages are in good agreement with those of moraines that have been attributed to the Egesen stadial. Assuming unchanged precipitation, summer temperature in the southern ecrins massif at ~12 ka must have been at least 2 degrees C lower relative to the LIA.

Published
2019

47. The Local Last Glacial Maximum of the southern Scandinavian Ice Sheet front: Cosmogenic nuclide dating of erratics in northern Poland

Author

Tylmann, Karol, Rinterknecht, Vincent, Woźniak, Piotr, BOURLES, Didier, Schimmelpfennig, Irene, Guillou, Valery, Aumaitre, Georges, Keddadouche, Karim, Laboratoire de géographie physique (LGP), Université Panthéon-Sorbonne (UP1)-Centre National de la Recherche Scientifique (CNRS), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Université Paris 1 Panthéon-Sorbonne (UP1)-Centre National de la Recherche Scientifique (CNRS), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), University of Gdańsk (UG), and Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010506 paleontology, Archeology, 010504 meteorology & atmospheric sciences, Specific time, 01 natural sciences, law.invention, Time windows, law, local last glacial maximum, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Radiocarbon dating, [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, Cosmogenic nuclide, poznan (frankfurt) phase cosmogenic nuclide dating, Ecology, Evolution, Behavior and Systematics, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Global and Planetary Change, geography, geography.geographical_feature_category, scandinavian ice sheet erratics, Front (oceanography), Geology, Last Glacial Maximum, 13. Climate action, Moraine, [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology, l phase, Physical geography, Ice sheet
Abstract

International audience; This paper presents new results of terrestrial cosmogenic nuclide dating of erratics in northern Poland. We report the first exposure ages of erratics located on the pre-Local Last Glacial Maximum and the Local Last Glacial Maximum moraines in Poland. Published radiocarbon ages are calibrated and used as a background indicator of the possible time window for the Local Last Glacial Maximum. The terrestrial cosmogenic nuclide exposure ages presented in this study indicate that: (1) exposure ages of erratics located on the pre-Local Last Glacial Maximum moraines (15.9 +/- 1.4 to 101.7 +/- 8.5 ka) are not clustered around any specific time interval, (2) the age of the ice sheet retreat from the Local Last Glacial Maximum ice limit in western Poland is 20.7 +/- 0.8 ka and the probable duration of the Local Last Glacial Maximum in western and central Poland is between similar to 25 ka and similar to 21 ka, (3) the age of the ice sheet retreat from the Local Last Glacial Maximum ice limit in eastern Poland is 17.3 +/- 0.5 ka and the probable duration of the Local Last Glacial Maximum in eastern Poland is between similar to 22 ka and similar to 18 ka. Our results show that the Local Last Glacial Maximum ice limit in western and central Poland is probably similar to 3 ka older than in eastern Poland.

Published
2019

48. The meteorite flux of the last 2 Myr recorded in the Atacama desert

Author

Drouard, Alexis, Gattacceca, Jérôme, Hutzler, Aurore, Rochette, Pierre, Braucher, Régis, Bourlès, Didier Louis D., Gounelle, Matthieu, Morbidelli, Alessandro, Debaille, Vinciane, Van Ginneken, Matthias, Valenzuela, Millarca, Quesnel, Yoann, Martinez, Rodrigo, Aumaître, Georges, Keddadouche, Karim, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Lunar and Planetary Institute [Houston] (LPI), Sorbonne Universités (COMUE), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Université libre de Bruxelles (ULB), Geological Survey of Belgium, SERNAGEOMIN, Partenaires INRAE, Millennium Institute of Astrophysics, Museo del Meteorito, Programme National de Planetologie (PNP, Institut National des Sciences de l'Univers/Centre National des Etudes Spatiales [INSU/CNES]), Agence Nationale de la Recherche (project FRIPON) [ANR13-BS05-0009], program 'program 'Investissements d'Avenir' [ANR-10-EQPX-20], Chilean scientific agency Comision Nacional de Investigacion Cientifica y Tecnologica (CONICYT, FONDECYT) [3140562, 11171090], European Research Council (ERC) Starting Grant (StG), Fund for Scientific Research (FRS-FNRS), BelgiumFonds de la Recherche Scientifique - FNRS, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Agriculture and Agri-Food [Ottawa] (AAFC), Laboratoire d'Etude de la Matière Extraterrestre (LEME), Muséum national d'Histoire naturelle (MNHN), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Université Libre de Bruxelles [Bruxelles] (ULB), Imperial College London, Universita Catolica de Chile, Earth System Sciences, Analytical, Environmental & Geo-Chemistry, and Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA)

Subjects
ordinary chondritic metrorites, 010504 meteorology & atmospheric sciences, collection area, [SDE.MCG]Environmental Sciences/Global Changes, [SDV]Life Sciences [q-bio], Flux, FOS: Physical sciences, asterobelt, earth, 010502 geochemistry & geophysics, 01 natural sciences, Astrobiology, Chondrite, evolution, [SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology, Cosmogenic nuclide, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Géologie, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Earth and Planetary Astrophysics (astro-ph.EP), [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, ages, Meteoroid, myr, Geology, Meteorite, 13. Climate action, Asteroid belt, Quaternary, Astrophysics - Earth and Planetary Astrophysics
Abstract

The evolution of the meteorite flux to Earth can be studied by determining the terrestrial ages of meteorites collected in hot deserts. We measured the terrestrial ages of 54 stony meteorites from the El Médano area, in the Atacama Desert, Chile, using the cosmogenic nuclide 36Cl. With an average age of 710 ka, this collection is the oldest collection of nonfossil meteorites at Earth's surface. This allows both determination of the average meteorite flux intensity over the past 2 m.y. (222 meteorites larger than 10 g per km2 per m.y.) and discussion of its possible compositional variability over the Quaternary Period. A change in the flux composition, with more abundant H chondrites, occurred between 1 and 0.5 Ma, possibly due to the direct delivery to Earth of a meteoroid swarm from the asteroid belt., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2019

49. Geochronology, paleogeography, and archaeology of the Acheulian locality of ‘Evron Landfill in the western Galilee, Israel

Author

Shemer, Maayan, Crouvi, Onn, Shaar, Ron, Ebert, Yael, Matmon, Ari, Horwitz, Liora Kolska, Eisenmann, Vera, Enzel, Yehouda, Barzilai, Omry, ARNOLD, Maurice, Aumaitre, Georges, Bourles, D.L., KEDDADOUCHE, Karim, ASTER, Team, Institute of Earth Sciences, The Hebrew University in Jerusalem, A. Safra Campus, 91904, Jerusalem, Israel, Paléobiodiversité et paléoenvironnements, Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), israel Antiquities Authority, Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Muséum national d'Histoire naturelle (MNHN)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), Muséum national d'Histoire naturelle (MNHN)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), and Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010506 paleontology, Paleomagnetism, geography, Marsh, geography.geographical_feature_category, 010504 meteorology & atmospheric sciences, Lower Paleolithic, Pleistocene, Fluvial, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, 01 natural sciences, Archaeology, Arts and Humanities (miscellaneous), Stratigraphy, Geochronology, General Earth and Planetary Sciences, Geology, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Earth-Surface Processes, Faunal assemblage
Abstract

A multidisciplinary study was conducted in a newly discovered Paleolithic locality, named ‘Evron Landfill. This locality is a part of the Lower Paleolithic complex of ‘Evron located at the western Galilee, Israel. Examination of artifacts has enabled the cultural attribution of ‘Evron Landfill to the Early Acheulian, while detailed paleomagnetic stratigraphy places the hominin occupations near the Brunhes–Matuyama transition ~0.77 Ma. This age is constrained by cosmogenic isotope burial dating of the sediments overlying the Paleolithic finds, providing a minimum age of ~0.66±0.11 Ma for hominin activity at the site. These results are further supported by the biochronological information derived from the faunal assemblage. Comparative analyses of faunal remains and lithic artifacts from ‘Evron Landfill demonstrate similarities to the assemblages from the Early Acheulian site of Evron Quarry, located ~300 m to the south. Pedo-sedimentological analyses indicate that hominin activity took place in a marsh environment in proximity to the Mediterranean coast, which probably fluctuated in both space and time with a fluvial environment. In addition, this study provides important data about ancient coastal activity during the early to middle Pleistocene.

Published
2019

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