Episodic reactivation of carbonate fault zones with implications for permeability – An example from Provence, Southeast France
| Autor: | Rodrigo S.M. Corrêa, Estibalitz Ukar, Stephen E. Laubach, Irène Aubert, Juliette Lamarche, Qiqi Wang, Daniel F. Stockli, Lisa D. Stockli, Toti E. Larson |
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| Přispěvatelé: | University of Texas at Austin [Austin], Bureau of Economic Geology [Austin] (BEG), Jackson School of Geosciences (JSG), University of Texas at Austin [Austin]-University of Texas at Austin [Austin], 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) |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Stratigraphy
Fault reactivation Geology Opening-mode fracture Oceanography Diagenesis Veins Stable isotope geochemistry Geophysics Fluid flow [SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph] Economic Geology Calcite cement U–Pb geochronology |
| Zdroj: | Marine and Petroleum Geology Marine and Petroleum Geology, 2022, 145, pp.105905. ⟨10.1016/j.marpetgeo.2022.105905⟩ |
| ISSN: | 0264-8172 |
| DOI: | 10.1016/j.marpetgeo.2022.105905⟩ |
| Popis: | International audience; Exposed in large, continuous outcrops in Provence, southern France, the Castellas fault formed as a normal fault in the Upper Cretaceous and was reactivated as a left-lateral fault in the Eocene. Structural, petrographical, isotopic, and geochronological analyses shed light on the sequence of deformational-diagenetic stages of the fault zone and help identify properties that controlled fluid-flow behavior through time. Abrupt contrasts in fracture abundance compared to the undeformed host rock define a damage zone containing fractures arranged in regularly spaced clusters. We identified eleven episodes of calcite cementation within opening-mode fractures and host rock primary pores. Cement fabrics, sediment fills, and geochemistry show evidence of shallow burial environments. U–Pb geochronology of calcite cements indicate two main deformational phases of the fault zone during the Albo-Cenomanian Durancian uplift and Eocene Pyrenean orogeny at ca. 90 Ma and 50-40 Ma, respectively. Deformation created poro-permeability, but cementation followed shortly after, pervasively occluding most of the fault zone porosity by the end of the Eocene. |
| Databáze: | OpenAIRE |
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