Alpine Ductile Deformation of the Upper Iberian Collided Margin (Eaux-Chaudes Massif, West-Central Pyrenean Hinterland, France)
Caldera, Norbert (Universitat Autònoma de Barcelona. Departament de Geologia)
Teixell Cácharo, Antonio (Universitat Autònoma de Barcelona. Departament de Geologia)
Griera Artigas, Albert (Universitat Autònoma de Barcelona. Departament de Geologia)
Labaume, Pierre (Université de Montpellier)
Guardia, Marc (Universitat Autònoma de Barcelona. Departament de Geologia)

Data:	2023
Resum:	The Eaux-Chaudes massif provides keys to unravel the deep-seated deformation of the Iberian rifted margin during the Alpine orogeny in the Pyrenees. The massif conforms to an inlier of upper Cretaceous carbonate rocks within the Paleozoic basement of the western Axial Zone, originally deposited in the upper margin shelf before the Cenozoic collision. New geological mapping and cross-section construction lead to the description of the lateral structural variation from a km-scale fold nappe in the west to a ductile, imbricate fold-thrust fan in the east. The transition from a Variscan pluton to Devonian metasediments underlying the autochthonous Cretaceous induced this structural change. Recumbent folding, which involved upper Paleozoic rocks, was facilitated by a lower detachment in Silurian slates and an upper detachment in an overlying Keuper shale and evaporite thrust sheet. Remnants of this allochthonous sheet form shale and ophite bodies pinched within the upper Cretaceous carbonates, conforming unusual tertiary welds. Ductile shear in the overturned limb of the Eaux-Chaudes fold nappe imparted strong mylonitic foliation in carbonate rocks, often accompanied by N-S stretching lineation and top-to-the-south kinematic indicators. The burial of the massif by basement-involved thrust sheets and the Keuper sheet, along with their Mesozoic-Cenozoic cover, account for ductile deformation conditions and a structural style not reported hitherto for the Alpine Pyrenees. A hypothesis for the tectonic restoration of this part of the Pyrenean hinterland is finally proposed.
Ajuts:	Ministerio de Economía y Competitividad CGL2014-54180 Agencia Estatal de Investigación PGC2018-093903-B-C21
Nota:	Altres ajuts: acords transformatius de la UAB
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, 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 publicada
Publicat a:	Tectonics, Vol. 42, Issue 11 (November 2023) , art. e2023TC007828, ISSN 1944-9194

DOI: 10.1029/2023TC007828

25 p, 7.9 MB

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