Microstructures of epidote-prehnite bearing damaged granitoids (northern Victoria Land, Antarctica): clues for the interaction between faulting and hydrothermal fluids
International audience Exhumed faults in granitoids along the Lanterman Fault-Rennick Graben Fault system (northern Victoria Land, Antarctica) show superposed ductile to brittle deformation and pervasive hydrothermal fluid-rock interaction. These processes triggered multiple brittle slip events prod...
Published in: | Journal of Structural Geology |
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Online Access: | https://hal.science/hal-03206964 https://hal.science/hal-03206964/document https://hal.science/hal-03206964/file/Malatesta_JSG_2021.pdf https://doi.org/10.1016/j.jsg.2021.104350 |
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ftunivantilles:oai:HAL:hal-03206964v1 2023-11-12T04:02:18+01:00 Microstructures of epidote-prehnite bearing damaged granitoids (northern Victoria Land, Antarctica): clues for the interaction between faulting and hydrothermal fluids Malatesta, Cristina Crispini, Laura Ildefonse, Benoit Federico, Laura Lisker, Frank Läufer, Andreas Department of Earth, Environmental and Life Sciences (DISTAV) Università degli studi di Genova = University of Genoa (UniGe) Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Universität Bremen Federal Institute for Geosciences and Natural Resources (BGR) 2021 https://hal.science/hal-03206964 https://hal.science/hal-03206964/document https://hal.science/hal-03206964/file/Malatesta_JSG_2021.pdf https://doi.org/10.1016/j.jsg.2021.104350 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsg.2021.104350 hal-03206964 https://hal.science/hal-03206964 https://hal.science/hal-03206964/document https://hal.science/hal-03206964/file/Malatesta_JSG_2021.pdf doi:10.1016/j.jsg.2021.104350 info:eu-repo/semantics/OpenAccess ISSN: 0191-8141 Journal of Structural Geology https://hal.science/hal-03206964 Journal of Structural Geology, 2021, 147, pp.104350. ⟨10.1016/j.jsg.2021.104350⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2021 ftunivantilles https://doi.org/10.1016/j.jsg.2021.104350 2023-10-31T23:36:01Z International audience Exhumed faults in granitoids along the Lanterman Fault-Rennick Graben Fault system (northern Victoria Land, Antarctica) show superposed ductile to brittle deformation and pervasive hydrothermal fluid-rock interaction. These processes triggered multiple brittle slip events producing crosscutting epidote and prehnite-rich fault veins, ultracataclasites and pseudotachylytes of crushing origin. Combined microstructural and minerochemical investigations on fault damage zones show three types of alteration: (i) albitization of K-feldspar and Caplagioclase; (ii) crystallization of prehnite and calcite in veins; (iii) alteration of magmatic phases by secondary hydrous minerals (e.g. chlorite, white mica, epidote and prehnite). The fault experienced various episodes of strain weakening and hardening, due to alteration of minerals and precipitation of epidote and prehnite within ultracataclastic intervals, at decreasing temperature conditions (200 < T • C < 450) and varying CO 2 fugacity of the fluids. Cyclic crystallization of epidote/prehnite within the fault cores caused cementation and locking of faults, concentration of deformation at weaker horizons and a progressive broadening of the fault zone. Our results indicate that multiple co-seismic slip and syntectonic fluid flow very likely occurred prior to the Cenozoic brittle reactivation of inherited anisotropies in the northern Victoria Land crust along the Lanterman Fault-Rennick Graben Fault system and underlines its high potential for polyphasicity. Article in Journal/Newspaper Antarc* Antarctica Victoria Land Université des Antilles (UAG): HAL Victoria Land Rennick ENVELOPE(161.500,161.500,-72.000,-72.000) Journal of Structural Geology 147 104350 |
institution |
Open Polar |
collection |
Université des Antilles (UAG): HAL |
op_collection_id |
ftunivantilles |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Malatesta, Cristina Crispini, Laura Ildefonse, Benoit Federico, Laura Lisker, Frank Läufer, Andreas Microstructures of epidote-prehnite bearing damaged granitoids (northern Victoria Land, Antarctica): clues for the interaction between faulting and hydrothermal fluids |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Exhumed faults in granitoids along the Lanterman Fault-Rennick Graben Fault system (northern Victoria Land, Antarctica) show superposed ductile to brittle deformation and pervasive hydrothermal fluid-rock interaction. These processes triggered multiple brittle slip events producing crosscutting epidote and prehnite-rich fault veins, ultracataclasites and pseudotachylytes of crushing origin. Combined microstructural and minerochemical investigations on fault damage zones show three types of alteration: (i) albitization of K-feldspar and Caplagioclase; (ii) crystallization of prehnite and calcite in veins; (iii) alteration of magmatic phases by secondary hydrous minerals (e.g. chlorite, white mica, epidote and prehnite). The fault experienced various episodes of strain weakening and hardening, due to alteration of minerals and precipitation of epidote and prehnite within ultracataclastic intervals, at decreasing temperature conditions (200 < T • C < 450) and varying CO 2 fugacity of the fluids. Cyclic crystallization of epidote/prehnite within the fault cores caused cementation and locking of faults, concentration of deformation at weaker horizons and a progressive broadening of the fault zone. Our results indicate that multiple co-seismic slip and syntectonic fluid flow very likely occurred prior to the Cenozoic brittle reactivation of inherited anisotropies in the northern Victoria Land crust along the Lanterman Fault-Rennick Graben Fault system and underlines its high potential for polyphasicity. |
author2 |
Department of Earth, Environmental and Life Sciences (DISTAV) Università degli studi di Genova = University of Genoa (UniGe) Géosciences Montpellier Institut national des sciences de l'Univers (INSU - CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) Universität Bremen Federal Institute for Geosciences and Natural Resources (BGR) |
format |
Article in Journal/Newspaper |
author |
Malatesta, Cristina Crispini, Laura Ildefonse, Benoit Federico, Laura Lisker, Frank Läufer, Andreas |
author_facet |
Malatesta, Cristina Crispini, Laura Ildefonse, Benoit Federico, Laura Lisker, Frank Läufer, Andreas |
author_sort |
Malatesta, Cristina |
title |
Microstructures of epidote-prehnite bearing damaged granitoids (northern Victoria Land, Antarctica): clues for the interaction between faulting and hydrothermal fluids |
title_short |
Microstructures of epidote-prehnite bearing damaged granitoids (northern Victoria Land, Antarctica): clues for the interaction between faulting and hydrothermal fluids |
title_full |
Microstructures of epidote-prehnite bearing damaged granitoids (northern Victoria Land, Antarctica): clues for the interaction between faulting and hydrothermal fluids |
title_fullStr |
Microstructures of epidote-prehnite bearing damaged granitoids (northern Victoria Land, Antarctica): clues for the interaction between faulting and hydrothermal fluids |
title_full_unstemmed |
Microstructures of epidote-prehnite bearing damaged granitoids (northern Victoria Land, Antarctica): clues for the interaction between faulting and hydrothermal fluids |
title_sort |
microstructures of epidote-prehnite bearing damaged granitoids (northern victoria land, antarctica): clues for the interaction between faulting and hydrothermal fluids |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03206964 https://hal.science/hal-03206964/document https://hal.science/hal-03206964/file/Malatesta_JSG_2021.pdf https://doi.org/10.1016/j.jsg.2021.104350 |
long_lat |
ENVELOPE(161.500,161.500,-72.000,-72.000) |
geographic |
Victoria Land Rennick |
geographic_facet |
Victoria Land Rennick |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_source |
ISSN: 0191-8141 Journal of Structural Geology https://hal.science/hal-03206964 Journal of Structural Geology, 2021, 147, pp.104350. ⟨10.1016/j.jsg.2021.104350⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsg.2021.104350 hal-03206964 https://hal.science/hal-03206964 https://hal.science/hal-03206964/document https://hal.science/hal-03206964/file/Malatesta_JSG_2021.pdf doi:10.1016/j.jsg.2021.104350 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.jsg.2021.104350 |
container_title |
Journal of Structural Geology |
container_volume |
147 |
container_start_page |
104350 |
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1782334107676573696 |