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16 results on '"Ruffet, G."'

1. Multidisciplinary characterisation of fluid sources in Variscan distile shear zones. Conference

Author

Camille Dusséaux, Gébelin, A., Philippe Boulvais, Ruffet, G., Michel Dubois, Marc Poujol, Cogné, N., yannick branquet, Mottram, C., Barou, F., Andreas Mulch, Laboratoire de Génie Civil et Géo-Environnement (LGCgE) - ULR 4515 (LGCgE), Université d'Artois (UA)-Université de Lille-Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-JUNIA (JUNIA), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), and Université de Lille

Subjects
[SDE]Environmental Sciences
Abstract

ACTI; International audience

Published
2020

2. Geometry and correlation of the nappe stack in the Ibero-Armorican arc across the Bay of Biscay: a joint French-Spanish project, Part 1: the data

Author

Ballèvre, M., Bosse, V., Ducassou, C., Paquette, J.-L., Peucat, J.-J., Pitra, P., Poujol, M., Ruffet, G., Martínez Catalán, J.R., Abati, J., López-Carmona, A., Díez Fernández, R., Arenas, R., Castiñeiras, P., Fernández-Suárez, J., Sánchez Martínez, S., and Gómez Barreiro, J.

Abstract

of an oral presentation in a congress

Published
2012
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3. Lézignan-La-Cèbe. Bois de Riquet. Bilan Scientifique 2011

Author

Crochet, J.-Y., Antoine, P.-O., Argant, J., Boulbes, N., BOURGUIGNON , B., Capdevila, R., Duval, M., Filoux, A., FIRMAT, C., Ivorra, J., Michaux, J., Ruffet, G., VALENSI., P., BRASSEUR, L., 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), and DRAC Languedoc-Roussillon, SRA

Subjects
[SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory
Published
2012

4. Structural and geochronological study of high-pressure metamorphic rocks in the Kekesu section (NW China): implications for the Late Paleozoic tectonics of the southern Tianshan

Author

Wang, B., Faure, M., Shu, L.-S., De-Jong, K., Charvet, J., Cluzel, D., Jahn, B.-m., Chen, Y., Ruffet, G., BUNC, Pole ID, Pôle Pluridisciplinaire de la Matière et de l'Environnement (PPME), and Université de la Nouvelle-Calédonie (UNC)

Subjects
[SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, [SDE.MCG] Environmental Sciences/Global Changes, [SDE.MCG]Environmental Sciences/Global Changes, [SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics
Published
2010

5. Disturbance of the monazite U-Th-Pb chronometer by fluids: A study combining stable isotopes and in situ dating

Author

Boulvais, P., Bosse, V., Gautier, P., Massimo Tiepolo, Ruffet, G., Devidal, J. L., Dubigeon, Isabelle, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Géosciences Rennes (GR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS), Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), and Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Abstract

International audience; The monazite U-Th-Pb chronometer is extensively used to date metamorphic rocks because it is usually considered to be resistant to diffusive Pb loss at temperatures as high as 800°C. However, age perturbations are sometimes documented in monazite grains showing distinct compositional and age domains. The mechanism by which Pb is lost is not well understood. Fluid-assisted recrystallization has been shown to constitute an efficient mean to reset the monazite chronometer in experimental conditions (Seydoux-Guillaume et al. 2002). Whether the same holds true in natural systems remains to be documented. Here we present in situ U-Th-Pb ages on monazite from foliated pegmatitic veins from highly strained levels of the Central Rhodope metamorphic pile (Greece, Bulgaria), together with oxygen isotope characterization and 40Ar-39Ar data. U-Th-Pb ages were obtained by (LA)-ICPMS on 8 monazite grains from three samples. In one sample from Bulgaria, the ages are concordant at 35 Ma, and no chemical zonation is observed. Quartz and feldspar have ..18O values consistent with equilibration at high temperatures. Microfabrics in the vein and the host rocks indicate high grade conditions of deformation. In the two other samples, from Greece, monazite grains show distinct chemical domains and yield discordant U-Th-Pb ages ranging from 52 to 36 Ma. Strong oxygen isotope disequilibrium between quartz and feldspar argues for a complex fluid history: high-..18O fluids first invaded rocks and were followed by low-..18O fluids at lower temperatures. Low temperature fluid circulation at around 36 Ma is consistent with 40Ar-39Ar dating of both samples at 33-34 Ma (mica plateau ages) and with microfabrics documenting a transition from high grade to greenschist facies conditions of deformation during intense shearing. These data confirm the capacity of fluids in disturbing significantly the monazite chronometer.

Published
2007

6. Geochronological constraints on the magmatic and hydrothermal evolution of the tras-os-montes hercynian domain (Galica, Spain) : position of the AU, SN-W mineralizing events

Author

Eric Gloaguen, Ruffet, G., Patrick Monié, yannick branquet, Alain Chauvet, Vincent Bouchot, Institut des Sciences de la Terre d'Orléans (ISTO), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Géosciences Rennes (GR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS), Department of Earth and Planetary Sciences [Kobe], Kobe University, Laboratoire Dynamique de la Lithosphère (LDL), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), and Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy
Abstract

International audience; The study area is located in the Galicia-Trás-os-Montes Zone (GTMZ zone, Arenas et al. 1986, Fig. 1), that belongs to the internal zone of the Hercynian belt and is composed of a relative autochthonous and parautochthonous units overthrusted by allochthonous complexes (Ribeiro et al. 1990). This domain of Palaeozoic schists is affected by a low to high temperature – medium pressure metamorphism. These rocks exhibit a well-developed regional schistosity related to nappes emplacement (D1 and D2 events) and are affected by NS-trending crenulation lineation and folds (D3 event) The late D3 event is characterized by a high-temperature metamorphism leading to development of local migmatite. Both parautochthonous and allochthonous units are intruded by syn- and post-kinematic plutons. Four generations of granites (G1 to G4) are identified by their textural and geochemical characteristics and by crosscutting relationships. Gold deposits are spatially associated with the G3 granites whereas Sn-W deposits are represented, in the study area, by disseminated and vein-type mineralization spatially close to the G2 granites (fig. 1).

Published
2006

7. Traçage des percolations de fluides et calage thermo-chronologique de l'évolution des socles cristallins : apport de l'étude des remplissages de fractures de l'Ouest de la chaine varisque

Author

Cathelineau, M., Fourcade, S., Boiron, M.C., Belcourt, O., Coulibaly, Y., Cuney, M., Guillocheau, F., Ruffet, G., Clauer, N., Barbarand, J., Pagel, M., Deloule, E., Centre de géochimie de la surface (CGS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Institut national des sciences de l'Univers (INSU - CNRS), and Aunis, Danièle

Subjects
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Published
2006

10. Contrôles structuraux, rhéologiques et temporels sur la formation de gisements Au et Sn-W liés aux granites : exemples de gisements hercyniens (Galice, NW Espagne)

Author

Eric Gloaguen, Alain Chauvet, yannick branquet, Ruffet, G., Vincent Bouchot, Boiron, M. C., Cathelineau, M., Marignac, C., Fourcade, S., Catherine Lerouge, Gerbeaud, O., Institut des Sciences de la Terre d'Orléans (ISTO), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Dynamique de la Lithosphère (LDL), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Géosciences Rennes (GR), Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), 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), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS), and Université de Lorraine (UL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy
Published
2005

11. Relations between Au / Sn-W mineralizations and late hercynian granite: Preliminary results from the Schistose Domain of Galicia-Trás-os-Montes Zone, Spain

Author

Eric Gloaguen, Alain Chauvet, yannick branquet, Gerbeaud, O., Claire Ramboz, Vincent Bouchot, Catherine Lerouge, Patrick Monié, Cathelineau, M., Boiron, M. C., Marignac, C., Pourraz, N., Fourcade, S., Ruffet, G., Iglesias Ponce Léon, M., Institut des Sciences de la Terre d'Orléans (ISTO), Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Dynamique de la Lithosphère (LDL), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Department of Earth and Planetary Sciences [Kobe], Kobe University, Géologie et gestion des ressources minérales et énergétiques (G2R), Université Henri Poincaré - Nancy 1 (UHP)-Institut National Polytechnique de Lorraine (INPL)-Centre de recherches sur la géologie des matières premières minérales et énergétiques (CREGU)-Centre National de la Recherche Scientifique (CNRS), 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), Géosciences Rennes (GR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS), GDR N°2458 - TRANSMET, Université de Lorraine (UL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and Université de Rennes (UR)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre Armoricain de Recherches en Environnement-Centre National de la Recherche Scientifique (CNRS)

Subjects
Spain, hydrothermalism, W-Sn deposits, Au, mesothermal mineralization, late hercynian granites, Galicia, [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy
Abstract

International audience; Au and W-Sn mineralization of the Schistose Domain of Galicia-Trás-os-Montes are spatially related to late hercynian granites. The Bruès (Au) and the Mina Soriana W-(Sn) deposits are studied. Both show some similarities and are assumed to form in the same tectonic and metamorphic context, on top of the granites. The role of the granite as a source for mineralizing fluids and rheological control for vein emplacement is re-adressed and discussed.

Published
2003

15. Middle Jurassic volcanism in the Northern and Central Andes

Author

Romeuf, N., Soler, Pierre, Jaillard, Etienne, Aguirre, L., Féraud, G., and Ruffet, G.

Subjects
ARC VOLCANIQUE, JURASSIQUE, ETUDE REGIONALE, RHYOLITE, ANALYSE MINERALOGIQUE, BASALTE, DATATION, MAGMATISME CALCOALCALIN, VOLCANISME, SUBDUCTION, LAVE, MARGE CONTINENTALE ACTIVE, GEODYNAMIQUE, PYROCLASTITE, ROCHE VOLCANIQUE, ANALYSE PETROGRAPHIQUE, ANDESITE
Published
1995

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