Floor-age constraining of a tectonic paroxysm of the Pyrenean orogen. LateMiddle Eocene mammal age of a faulted karstic filling of the Quercy phosphorites, south-western France
Jg. Astruc et al., Floor-age constraining of a tectonic paroxysm of the Pyrenean orogen. LateMiddle Eocene mammal age of a faulted karstic filling of the Quercy phosphorites, south-western France, GEODIN ACTA, 13(5), 2000, pp. 271-280
Breaking effects of a Pyrenean compressive tectonic phase are recognised in
northern Pyrenean foreland, such as in the Quercy Jurassic limestone platf
orm. The age of this phase still remains poorly constrained. In the so-call
ed Quercy phosphorites area, within the Prajoux-Memerlin paleokarst system
near the city of Cajarc, a clay filling shows a strike slip fault effect. c
lose to N-S direction. According to an analysis of the mammal fauna and inf
erred chronology of the polyphased paleokarst infilling, the age of the fau
lted clay is late Middle Eocene, with a mammal age estimate of 31.5 Ma. Thi
s provides reliable precise Boor-age constraining for the involved sismo-te
ctonic paroxysm, seemingly related to the Pyrenean tectonic compressive pha
se. (C) 2000 Editions scientifiques ct medicales Elsevier SAS.