Thermochronology constraints for the propagation sequence of the south Pyrenean basement thrust system (France‐Spain)

摘要: [1] In this work we combined apatite fission track and biotite/K-feldspar 40Ar/39Ar ages with tectonic data in the west central part of Axial Zone Pyrenees. We discuss exhumation rates Neouvielle, Bordere-Louron, Bielsa Variscan granites their relationships timing sequence south vergent basement thrusting within Pyrenean orogenic prism. The on K-feldspars from Neouvielle massif (sample NV7) seem to indicate movements Eaux-Chaudes thrust during early middle Eocene. Fission results suggest that occurred around 35 Ma Bordere-Louron 32 relation Gavarnie thrust. was exhumed 19 by out-of-sequence thus show whereas most faults (here Eaux-Chaudes, Gavarnie, Guarga thrusts) were active toward southern foreland Eocene earliest Miocene, some them thrust) activated out hinterland, later than generally accepted Aquitanian age for end compression. Finally, modeling a last cooling episode starting 5 which is certainly related Pliocene reexcavation northern flanks