Floor-age constraining of a tectonic paroxysm of the Pyrenean orogen. Late Middle Eocene mammal age of a faulted karstic filling of the Quercy phosphorites,south-western France |
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| Authors: | Jean Guy Astruc Gilles Escarguel Bernard Maranda Régine Simon-Coinçon |
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| Affiliation: | 1. BRGM service géologique régional Midi-Pyrénées, 12, rue Michel-Labrousse, BP 1342, 31106 Toulouse, France;2. Centre de paléontologie stratigraphique et paléoécologie, Fre-CNRS 2158, université Claude-Bemard-Lyon-1, 27–43, boulevard du 11-Novembre-1918, 69622 Villeurbanne cedex, France;3. Institut des sciences de l’évolution, UMR-CNRS 5455, université de Montpellier II, place Eugène-Bataillon, 34095 Montpellier cedex 5, France;4. Frnle des mines de Paris Centre d’informatique géologique, 35 rue Saint-Honoré, 77305 Fontainebleau cedex, et-UMR Svsiphe, Laboratoire de géologie appliquée, Université Pierre-et-Marie-Curie, 4, place Jussieu, 75005 Paris, France |
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| Abstract: | AbstractBreaking effects of a Pyrenean compressive tectonic phase are recognised in northern Pyrenean foreland, such as in the Quercy Jurassic limestone platform. The age of this phase still remains poorly constrained. In the so-called Quercy phosphorites area, within the Prajoux—Mémerlin paleokarst system near the city of Cajarc, a clay filling shows a strike slip fault effect, close to N-S direction. According to an analysis of the mammal fauna and inferred chronology of the polyphased paleokarst infilling, the age of the faulted clay is late Middle Eocene, with a mammal age estimate of 41.5 Ma. This provides reliable precise floor-age constraining for the involved sismo-tectonic paroxysm, seemingly related to the Pyrenean tectonic compressive phase. © 2000 Editions scientifiques et médicales Elsevier SAS |
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| Keywords: | paleokarst Pyrenean tectonics mammal dating Eocene Quercy France |
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