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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| Affiliation: | 1. College of Geography and Environment, Shandong Normal University, Jinan 250358, PR China;2. State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, PR China;3. College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, PR China;4. Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, PR China;1. GNS Science, Dunedin 9054, New Zealand;2. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany;3. Christian-Albrechts University of Kiel, Germany;4. GNS Science, Lower Hutt 5040, New Zealand;5. University of California, Santa Barbara, CA 93106, USA;6. AWI Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany;1. Department of Geosciences, James Cook University, Queensland 4811, Australia;2. Department of Earth Sciences, University of Adelaide, South Australia 5005, Australia;3. School of Earth Sciences, The University of Western Australia, Western Australia 6009, Australia |
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| Abstract: | Breaking 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. |
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