Timing of eocene-miocene thrust activity in the western axial zone and chaînons béarnais (west-central Pyrenees) revealed by multi-method thermochronology
Vicente Bosch, Gemma de (Université Rennes 1. Géosciences Rennes)
Teixell Cácharo, Antonio (Universitat Autònoma de Barcelona. Departament de Geologia)
Jolivet, Marc (Université Rennes 1. Géosciences Rennes)
Labaume, Pierre (Université de Montpellier. Géosciences Montpellier)
Stockli, Daniel F. (Jackson School of Geosciences)
Domènech, Mireia (Universitat Autònoma de Barcelona. Departament de Geologia)
Monié, Patrick (Université de Montpellier. Géosciences Montpellier)

Data:	2016
Resum:	We present new apatite (U-Th)/He (AHe), apatite fission track (AFT) and zircon (U-Th)/He (ZHe) data to unravel the timing of exhumation and thrusting in the western Axial Zone of the Pyrenees and the adjacent North Pyrenean Zone (Chaînons Béarnais). In the north, ZHe data yield cooling signals between 26-50 Ma in the Chaînons Béarnais, consistent with the onset of thrust-related cooling in the neighboring Mauléon basin modeled by previous authors. Non-reset Triassic ages are found in the footwall of the North Pyrenean Frontal thrust (Aquitaine basin). To the south, similar ZHe ages in both the hangingwall and footwall of the Lakora thrust record late Eocene to Oligocene cooling that we attribute to activity of the Gavarnie thrust. Thermal modeling of samples from the Lakora thrust hangingwall indicate cooling from early Eocene times, recording activity of the Lakora thrust. Paleozoic detrital samples from the westernmost Axial Zone and from the Eaux-Chaudes and Balaitous-Panticosa granitic plutons yield signals of AFT between 20-30 Ma and ZHe between 20-25 Ma. Modeling indicate fast cooling during this time that we attribute to motion of the Guarga thrust. AHe data from these Axial Zone plutons, combined with modeling, show a post-tectonic signal (8-9 Ma) that indicates renewed erosion after a period without major cooling and exhumation between 20 to 10 Ma.
Ajuts:	Ministerio de Economía y Competitividad CGL2010-15416 Ministerio de Economía y Competitividad CGL2014-54180-P
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Thermochronology ; Apatite fission tracks ; Apatite and zircon (U-Th)/He ; Thrusting ; Pyrenees
Publicat a:	Comptes rendus geoscience, Vol. 348, Issue 3-4 (March-April 2016) , p. 246-256, ISSN 1631-0713

DOI: 10.1016/j.crte.2016.01.001

Post-print 39 p, 3.9 MB

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