Closure of a hyperextended system in an orogenic lithospheric pop‐up, Western Pyrenees: The role of mantle buttressing and rift structural inheritance
Résumé
The Early Cretaceous hyperextended Mauléon rift is localized in the north-western
Pyrenean orogen. We infer the Tertiary evolution of the Mauléon basin through the
restoration of a 153-km-long crustal-scale balanced cross-section of the Pyrenean
belt, which documents at least 67 km (31%) of orogenic shortening in the Western
Pyrenees. Initial shortening, accommodated through inversion of inherited crustal
structures, led to formation of a pop-up structure, in which the opposite edges
underwent similar shortening with different tectonic reactivation styles, localized
versus. distributed. Underthrusting of the Iberian margin accommodated further
convergence, forming the Axial Zone antiformal stack of crustal nappes within a
lithospheric pop-up. Thin-skinned and thick-skinned structures propagated outward
from the heart of this pop-up, a block of strong mantle acting as a buttress inhibiting
complete inversion of the Mauléon rift basin.
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