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1. Impact of heterogeneities and surface roughness on pXRF, pIR, XRD and Raman analyses: Challenges for on-line, real-time combined mineralogical and chemical analyses on drill cores and implication for 'high speed' Ni-laterite exploration

Author

Céline Rodriguez, Cédric Duée, Nicolas Maubec, Henry Pillière, Laure Capar, Yassine El Mendili, Beate Orberger, Stéphanie Gascoin, Karen Devaux, Valérie Laperche, Fabien Trotet, Mohamed Kadar, Monique Le Guen, Michaël Ollier, Fons Eijkelkamp, Thomas Lefevre, Daniel Chateigner, Harm Nolte, Anne Bourguignon, Dominique Harang, Peter Koert, Xavier Bourrat, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Géosciences Paris Sud (GEOPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique de l'état condensé (LPEC), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC), ERAMET RESEARCH, Eramet, Thermo Fisher Scientific Inc., Institut de Recherche Interdisciplinaire sur les enjeux Sociaux - sciences sociales, politique, santé (IRIS), Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Sorbonne Paris Cité (USPC)-École des hautes études en sciences sociales (EHESS)-Université Paris 13 (UP13), Royal Eijkelkamp, CATURA Geoprojects, 2 Rue Marie Davy, 75014, Paris, France, Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and ERAMET (ERAMET)

Subjects
chemistry.chemical_element, Mineralogy, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, 010501 environmental sciences, engineering.material, 010502 geochemistry & geophysics, 01 natural sciences, symbols.namesake, Geochemistry and Petrology, Breccia, Surface roughness, Laterite, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences, Surface states, Drill, Portable instruments, Diamond, Nickel, Surface effects, chemistry, [SDU]Sciences of the Universe [physics], engineering, symbols, Economic Geology, Nickel Garnierite, Drill cores, Raman spectroscopy, Geology
Abstract

International audience; On-line, real-time chemical and mineralogical analyses on drill cores are highly demanded by mining companies. However, they are a challenge because of drill core surface state and sample heterogeneities. We selected four rock samples: highly porous, siliceous breccia and serpentinized harzburgite coming from the base of a nickel laterite profile in New Caledonia which were sonic drilled, and fine grained, homogeneous sandstone and coarse grained granite which were diamond drilled and provided by Eijkelkamp Sonic Drill with unknown origin. The samples were analysed at five surface states (diamond or sonic drilled, cut as squares, polished at 6 and 0.25 μm, powdered

Published
2019
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2. Challenges in coupled on-line-on-mine-real time mineralogical and chemical analyses on drill cores

Author

Cédric Duée, Nicolas Maubec, Xavier Bourrat, Yassine Mendili, Stéphanie Gascoin, Daniel Chateigner, Beate Orberger, Monique Le Guen, Anne Salaün, Céline Rodriguez, Valérie Laperche, Laure Capar, Anne Bourguignon, Fons Eijkelkamp, Mohamed Kadar, Fabien Trotet, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Laboratoire de cristallographie et sciences des matériaux (CRISMAT), École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC), Géosciences Paris Sud (GEOPS), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Eramet, ERAMET RESEARCH, Royal Eijkelkamp, Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche sur les Matériaux Avancés (IRMA), Normandie Université (NU)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and ERAMET (ERAMET)

Subjects
Bergbau, Bergwerk, Markscheidekunde, Geoinformation, Prospektion, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Real-Time Mining, Konferenz, Real-Time Mining, Conference, ddc:624, [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy
Abstract

International audience; The SOLSA project aims to develop an innovative on-line-on-mine-real-time expert system, combining sonic drilling, mineralogical and chemical characterization and data treatment. Ideally, this combination, highly demanded by mining and metallurgical companies, will speed up exploration, mining and processing. In order to evaluate the instrumental parameters for the SOLSA expert system, portable and laboratory analyses have been performed on four samples with contrasting lithologies: siliceous breccia, serpentinized harzburgite, sandstone and granite. More precisely, we evaluated the influence of the surface state of the sample on the signals obtained by portable X-Ray Fluorescence (pXRF) for chemistry and portable Infra-Red spectroscopy (pIR) for mineralogy. In addition, laboratory Raman spectroscopy, X-Ray Diffraction (XRD), XRF and ICP-OES laboratory analyses were performed to compare surface bulk mineralogical and chemical analyses. This presentation highlights (1) the importance of coupling chemical and mineralogical analytical technologies to obtain most complete information on samples, (2) the effect of the sample surface state on the XRF and IR signals from portable instruments. The last point is crucial for combined instrumental on-line sensor design and the calibration of the different instruments, especially in the case of pXRF.

Published
2017

3. Combined Analysis extended to Raman and IR spectroscopies: SOLSA EU Project

Author

Daniel, Chateigner, Lutterotti, Luca, Henry, Pillière, Saulius, Grazulis, Yassine El Mendili, Sébastien, Petit, Stephanie, Gascoin, Thomas, Lefevre, Dominique, Harang, Beate, Orberger, Thanh, Bui, Cedric, Duée, Nicolas, Maubec, Xavier, Bourrat, Monique Le Guen, Anne, Salaün, Celine, Rodriguez, Gino, Mariotto, Marco, Giarola, Arun, Kumar, Nicola, Daldosso, Marco, Zanatta, Adolfo, Speghini, Andrea, Sanson, Borovin, Evgeny, Bortolotti, Mauro, Secchi, Maria, Montagna, Maurizio, Fons, Eijkelkamp, Harm, Nolte, Peter, Koert, Fabien, Trotet, Mohamed, Kadar, and Karen, Devaux

Published
2017

4. Coupled Mineralogy and Chemistry on drill core samples: benchmarking on-line-real-time analyses

Author

Beate, Orberger, Cedric, Duée, Nicoalas, Maubec, Valérie, Laperche, Laure, Capar, Anne, Bouruignon, Xavier, Bourrat, Yassine El Mendili, Stephanie, Gascoin, Daniel, Chateigner, Celine, Rodriguez, Anne, Salaün, Monique Le Guen, Gino, Mariotto, Marco, Giarola, Arun, Kumar, Nicola, Daldasso, Marco, Zanatta, Lutterotti, Luca, Borovin, Evgeny, Bortolotti, Mauro, Secchi, Maria, Montagna, Maurizio, Henry, Pillière, Thomas, Lefevre, Fons, Eijkelkamp, Harm, Nolte, Peter, Koert, Saulius, Grazulis, Fabien, Trotet, Mohammed, Kadar, and Karen, Devaux

Published
2017

5. Combined mineralogy and chemistry on drill cores: challenging for on-line real-time analyses

Author

Cedric, Duée, Beate, Orberger, Nicolas, Maubec, Valérie, Laperche, Laure, Capar, Anne, Bouruignon, Xavier, Bourrat, Yassine El Mendili, Stephanie, Gascoin, Daniel, Chateigner, Celine, Rordriguez, Anne, Salaün, Monique Le Guen, Gino, Mariotto, Marco, Giarola, Arun, Kumar, Nicola, Daldasso, Marco, Zanatta, Lutterotti, Luca, Borovin, Evgeny, Bortolotti, Mauro, Secchi, Maria, Montagna, Maurizio, Henry, Pillière, Thomas, Lefevre, Fons, Eijkelkamp, Harm, Nolte, Peter, Koertt, Saulius, Grazulis, Fabien, Trotet, Mohammed, Kadar, and Karen, Devaux

Published
2017

6. Exhumation of Syros and Sifnos metamorphic rocks (Cyclades, Greece). New constraints on the P-T paths

Author

Laurent Jolivet, Olivier Vidal, and Fabien Trotet

Subjects
Blueschist, chemistry.chemical_compound, chemistry, Geochemistry and Petrology, Greenschist, Metamorphic rock, CYCLADES, Geochemistry, Eclogite, Pile, Chlorite, Geology, Phengite
Abstract

Three different levels are recognised in the metamorphic pile of Syros and Sifnos. Well-preserved eclogites and blueschists occur at the top, whereas they are overprinted in the albite-epidote blueschist facies below, and in greenschist facies at the base. A multi-equilibrium approach involving several end members and solid-solution models for chlorite, phengite, and garnet is used to estimate the stability P-T conditions of different parageneses. The combination of textural criteria with the results of P-T calculations is consistent with the assumption of local equilibrium. Contrasted P-T conditions are inferred for successive parageneses coexisting out of equilibrium in the same samples. When considering all the P-T estimates together, contrasted P-T trends can be distinguished for the three different levels of the metamorphic pile. These trends are interpreted as the signature of the P-T paths followed by the rocks during their exhumation. The preservation of eclogitic parageneses at the top of the structural pile is correlated with cooling during decompression. In contrast, the progressive retrogression observed in the underlying rocks, toward the base of the metamorphic pile, is correlated with an increasing isothermal decompression before cooling.

Published
2001
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7. Tectono-metamorphic evolution of Syros and Sifnos islands (Cyclades, Greece)

Author

Laurent Jolivet, Olivier Vidal, and Fabien Trotet

Subjects
Blueschist, Geophysics, Shear (geology), Greenschist, Metamorphic rock, CYCLADES, Eclogite, Shear zone, Petrology, Geology, Seismology, Earth-Surface Processes, Nappe
Abstract

Miocene exhumation of metamorphic rocks in the Aegean Sea is partly a consequence of post-orogenic extension. If the post-orogenic mechanism of exhumation is rather well understood, the earlier syn-orogenic Eocene exhumation is still largely enigmatic. Previous authors have argued in terms of extension or compression. New structural and petrological data on Sifnos and Syros islands show that exhumation of high pressure–low temperature (HP–LT) rocks involves crustal-scale extensional ductile shear zones during the Eocene. We observe a continuum of top-to-the-NE and -E ductile shear from the Eocene (in the blueschist facies) to the Miocene (in the greenschist facies). This deformation is distributed in the eclogites and blueschists, whereas it is rather localised along ductile shear zones in the greenschists. Eclogites, which are preserved only at the top of the structural pile, are exhumed with a ‘cold’ retrograde P–T path. In the lower part of the structural pile we observe a progressive retrogression of eclogites in blueschist then greenschist facies. This lower part of pile is subsequently exhumed with P–T paths showing a nearly isothermal decompression before cooling. P–T–t-deformation data suggest that the Cycladic blueschists are progressively exhumed by a continuum of accretion at the base of the orogenic wedge, and by a partly non-coaxial extensional deformation above, distributed during the syn-orogenic stage, then localised during the post-orogenic stage. We then compare the mechanism of syn-orogenic exhumation of Crete and the Cyclades and we discuss a simple geodynamic scenario for the Aegean domain and the external Hellenides which accounts for (1) the southward migration of the Hellenic trench and arc during the Cenozoic; (2) the P–T–t-deformation data for the Cycladic blueschists and the Phyllite–quartzite nappe; and (3) the transition from syn-orogenic to post-orogenic in the Cyclades.

Published
2001
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8. A thermodynamic model for FE-MG aluminous chlorite using data from phase equilibrium experiments and natural pelitic assemblages in the 100 to 600 C, 1 to 25 kb range

Author

Olivier Vidal, Fabien Trotet, and Teddy Parra

Subjects
Chemistry, Analytical chemistry, Mineralogy, engineering.material, law.invention, chemistry.chemical_compound, Magazine, law, Aluminosilicate, Vacancy defect, engineering, Pelite, General Earth and Planetary Sciences, Chloritoid, Quartz, Chlorite, Solid solution
Abstract

The purpose of this study is to derive a solid solution model for aluminous (Si 1) which is not possible when using only one chlorite endmember (classically clinochlore). In particu- lar, reliable pressure estimates can be made for the common chlorite-quartz-carpholite or chloritoid or garnet bearing rocks devoid of aluminosilicates, whereas such esti- mates are impossible when using only one chlorite endmember. In the most favorable cases, temperature conditions can be estimated from the location of the temperature- dependent equilibrium 2 clinochlore 1 3 Mg-sudoite 5 4 Mg-amesite 1 7 quartz 1 4 H2O, that is from the composition of chlorite associated with quartz. Our chlorite solution model predicts that at fixed pressure and (XMg)chlorite, the location of this equilibrium is shifted toward higher temperature when decreasing the Si, Al VI , and vacancy contents and increasing the Al IV content. This result is compatible with the classical empirical thermometers based on the Al IV and vacancy contents in chlorite. However, the calculated effect of pressure is an increase of the Al IV ,A l VI , and vacancy contents. This explains why the empirical chlorite thermometers (based on the Al IV contents in chlorite) derived from low-T samples cannot be used at high pressure conditions.

Published
2001
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9. Along-strike variations of P-T conditions in accretionary wedges and syn-orogenic extension, the HP-LT Phyllite-Quartzite Nappe in Crete and the Peloponnese

Author

Bruno Goffé, Patrick Monié, Olivier Vidal, Loïc Labrousse, Bad'r Ghorbal, Fabien Trotet, Philippe Agard, Laurent Jolivet, Institut des Sciences de la Terre d'Orléans (ISTO), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Université de Tours (UT)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de géologie de l'ENS (LGENS), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Géosciences Montpellier, Université des Antilles et de la Guyane (UAG)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Géodynamique des Chaines Alpines (LGCA), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre de Paris (iSTeP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), ANR-06-BLAN-0156,EGEO,Rhéologie et déformation de la lithosphère égéenne(2006), Université de Tours-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Université de Tours-Centre National de la Recherche Scientifique (CNRS), Laboratoire de géologie de l'ENS (LGE), École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut des Sciences de la Terre (ISTerre), 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)-Centre National de la Recherche Scientifique (CNRS)-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Observatoire des Sciences de l'Univers de Grenoble [1985-2015] (OSUG [1985-2015]), Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology [2007-2019] (Grenoble INP [2007-2019])-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology [2007-2019] (Grenoble INP [2007-2019])-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut des Sciences de la Terre [2011-2015] (ISTerre [2011-2015]), and Université Joseph Fourier - Grenoble 1 (UJF)-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-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Centre National de la Recherche Scientifique (CNRS)

Subjects
Slab retreat, 010504 meteorology & atmospheric sciences, Subduction, Phyllite, Detachment, Metamorphic rock, [SDU.STU]Sciences of the Universe [physics]/Earth Sciences, Exhumation, 010502 geochemistry & geophysics, 01 natural sciences, Crete, Nappe, Accretionary complex, Geophysics, Slab, Erosion, High pressure and low temperature metamorphic rocks, Spatial evolution, Peloponnese, Petrology, Geology, Seismology, 0105 earth and related environmental sciences, Earth-Surface Processes
Abstract

International audience; Syn-orogenic detachments in accretionary wedges make the exhumation of high-pressure and low-temperature metamorphic rocks possible with little erosion. The velocity of exhumation within the subduction channel or the accretionary complex, and thus the shape of P-T paths, depend upon the kinematic boundary conditions. A component of slab retreat tends to open the channel and facilitates the exhumation. We document the effect of slab retreat on the shape of P-T paths using the example of the Phyllite-Quartzite Nappe that has been exhumed below the Cretan syn-orogenic detachment during the Miocene in Crete and the Peloponnese. Data show a clear tendency toward colder conditions at peak pressure and during exhumation where the intensity of slab retreat is larger. This spatial evolution of P-T gradient is accompanied with an evolution from a partly coaxial regime below the Peloponnese section of the detachment toward a clearly non-coaxial regime in Crete.

Published
2010
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10. Evidence of retrograde Mg-Carpholite in the Phyllite-Quartzite nappe of Peloponnese from thermobarometric modelisation - geodynamic implications

Author

Olivier Vidal, Laurent Jolivet, Bruno Goffé, Fabien Trotet, Queyroy, Marie José, Laboratoire de tectonique (LT), Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Cergy Pontoise (UCP), and Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, 010504 meteorology & atmospheric sciences, Subduction, Phyllite, Metamorphic rock, [SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics, Schist, Geochemistry, engineering.material, 010502 geochemistry & geophysics, 01 natural sciences, Nappe, Geophysics, engineering, Chloritoid, Carpholite, Geology, 0105 earth and related environmental sciences, Earth-Surface Processes
Abstract

A multiequilibrium thermobarometric approach was used to estimate the P-T conditions of successive metamorphic stages in carpholite-bearing blueschists that occur at the base of the Phyllite - Quartzite nappe of Peloponnese, in contact with the Ionian Plattenkalk. The calculated P-T conditions for successive metamorphic stages correlate well in samples from two different areas. A retrograde P-T path can be calculated, evolving from ~14 kbar, 400-450°C for chloritoid-bearing (carpholite-free) parageneses, to 11-13 kbar, 320-380°C for chloritoid + Mgcarpholite parageneses, ~7.5 kbar, 260-275°C for Mg-carpholite + sudoite parageneses, and ~3-4 kbar, ~250°C for parageneses involving only phyllosilicates. Thermobarometric calculations suggest that Mg-carpholite is a retrograde phase in the Peloponnese. This feature has never been observed elsewhere in high pressure-low temperature carpholite-bearing schists. The calculated P-T paths indicate that the Mgcarpholite blueschists were subducted to ~40km depth and m...

Published
2006

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