First in situ calcite U–Pb dating revealing the past episodes of the 2019 Le Teil Earthquake (France)
In the Rhône Valley near the city of Montélimar, a Mw 4.9 surface-rupturing earthquake occurring on the 11th of November 2019 was linked to the reactivation of the NE–SW trending normal La Rouvière fault as a reverse fault mechanism. Here, we present the first in situ calcite U–Pb data acquired on w...
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Académie des sciences
2024-12-01
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| Series: | Comptes Rendus. Géoscience |
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| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.280/ |
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| author | Gébelin, Aude Matonti, Christophe Larroque, Christophe Carr, Patrick Ampuero, Jean-Paul |
| author_facet | Gébelin, Aude Matonti, Christophe Larroque, Christophe Carr, Patrick Ampuero, Jean-Paul |
| author_sort | Gébelin, Aude |
| collection | DOAJ |
| description | In the Rhône Valley near the city of Montélimar, a Mw 4.9 surface-rupturing earthquake occurring on the 11th of November 2019 was linked to the reactivation of the NE–SW trending normal La Rouvière fault as a reverse fault mechanism. Here, we present the first in situ calcite U–Pb data acquired on well-characterized microstructures from core samples from a first exploratory drilling conducted in the NE part of the La Rouvière fault. In agreement with relative chronology data based on microstructural observations, our results allow us to define four main tectonic events: A first event from ~90 to 75 interpreted to reflect a thermal subsidence at the regional scale (Ardèche—South-East basin of France), a second event bracketed between ~60 to 50 Ma related to the N–S trending shortening of the South-East basin, a third tectonic event dated from ~40 to 37 Ma that we interpret to reflect the opening of the Gulf of Lion and European Cenozoic Rift System (ECRIS), and a fourth and final event at ~25 Ma that very likely represents a middle to late stage of the ECRIS. No more recent event has been identified on this fault. |
| format | Article |
| id | doaj-art-7caac21129db4d76acc7e460c7f61a1f |
| institution | Kabale University |
| issn | 1778-7025 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Géoscience |
| spelling | doaj-art-7caac21129db4d76acc7e460c7f61a1f2025-02-07T10:41:12ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252024-12-01356G119520910.5802/crgeos.28010.5802/crgeos.280First in situ calcite U–Pb dating revealing the past episodes of the 2019 Le Teil Earthquake (France)Gébelin, Aude0https://orcid.org/0000-0003-4765-8611Matonti, Christophe1https://orcid.org/0000-0001-8105-9642Larroque, Christophe2https://orcid.org/0000-0002-0866-9441Carr, Patrick3https://orcid.org/0000-0001-7076-1196Ampuero, Jean-Paul4https://orcid.org/0000-0002-4827-7987Université de Lorraine, UMR CNRS 7359, GeoRessources, F-54506 Vandœuvre-lès-Nancy, FranceGéoazur, Univ. Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, IRD, Valbonne, FranceGéoazur, Univ. Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, IRD, Valbonne, France; Université de Reims Champagne-Ardenne, GEGENA UR3795, Reims, FranceUniversité de Lorraine, UMR CNRS 7359, GeoRessources, F-54506 Vandœuvre-lès-Nancy, FranceGéoazur, Univ. Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, IRD, Valbonne, FranceIn the Rhône Valley near the city of Montélimar, a Mw 4.9 surface-rupturing earthquake occurring on the 11th of November 2019 was linked to the reactivation of the NE–SW trending normal La Rouvière fault as a reverse fault mechanism. Here, we present the first in situ calcite U–Pb data acquired on well-characterized microstructures from core samples from a first exploratory drilling conducted in the NE part of the La Rouvière fault. In agreement with relative chronology data based on microstructural observations, our results allow us to define four main tectonic events: A first event from ~90 to 75 interpreted to reflect a thermal subsidence at the regional scale (Ardèche—South-East basin of France), a second event bracketed between ~60 to 50 Ma related to the N–S trending shortening of the South-East basin, a third tectonic event dated from ~40 to 37 Ma that we interpret to reflect the opening of the Gulf of Lion and European Cenozoic Rift System (ECRIS), and a fourth and final event at ~25 Ma that very likely represents a middle to late stage of the ECRIS. No more recent event has been identified on this fault.https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.280/Le Teil earthquakeLa Rouvière faultU–Pb geochronologyCalcite veinsPyrite crystals |
| spellingShingle | Gébelin, Aude Matonti, Christophe Larroque, Christophe Carr, Patrick Ampuero, Jean-Paul First in situ calcite U–Pb dating revealing the past episodes of the 2019 Le Teil Earthquake (France) Comptes Rendus. Géoscience Le Teil earthquake La Rouvière fault U–Pb geochronology Calcite veins Pyrite crystals |
| title | First in situ calcite U–Pb dating revealing the past episodes of the 2019 Le Teil Earthquake (France) |
| title_full | First in situ calcite U–Pb dating revealing the past episodes of the 2019 Le Teil Earthquake (France) |
| title_fullStr | First in situ calcite U–Pb dating revealing the past episodes of the 2019 Le Teil Earthquake (France) |
| title_full_unstemmed | First in situ calcite U–Pb dating revealing the past episodes of the 2019 Le Teil Earthquake (France) |
| title_short | First in situ calcite U–Pb dating revealing the past episodes of the 2019 Le Teil Earthquake (France) |
| title_sort | first in situ calcite u pb dating revealing the past episodes of the 2019 le teil earthquake france |
| topic | Le Teil earthquake La Rouvière fault U–Pb geochronology Calcite veins Pyrite crystals |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.280/ |
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