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Closure of a hyperextended system in an orogenic lithospheric pop‐up, Western Pyrenees: The role of mantle buttressing and rift structural inheritance
Author(s) -
Saspiturry Nicolas,
Allanic Cécile,
Razin Philippe,
Issautier Benoit,
Baudin Thierry,
Lasseur Eric,
Serrano Olivier,
Leleu Sophie
Publication year - 2020
Publication title -
terra nova
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.353
H-Index - 89
eISSN - 1365-3121
pISSN - 0954-4879
DOI - 10.1111/ter.12457
Subject(s) - geology , rift , nappe , tectonics , lithosphere , inversion (geology) , cretaceous , paleontology , mantle (geology) , seismology , structural basin , crust
Abstract 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.