Inoceramid constraints on the timing of Sant Corneli anticline uplift (Tremp Basin, South-Central Pyrenees, NE Spain)
Mercedes-Martín, Ramon (Universitat Autònoma de Barcelona)
Walaszczyk, Ireneusz (Uniwersytet Warszawski)

Data:	2026
Resum:	The Sant Corneli Anticline is an asymmetric, westward-plunging structure located at the termination of the Boixols Thrust (Tremp Basin, Spanish Pyrenees). It was emplaced during the Late Cretaceous and generated an elongated, westward-deepening foredeep basin. A stratigraphic and palaeontological study of inoceramid bivalves from the southern flank of the Sant Corneli Anticline provides refined constraints on the timing and lateral distribution of synorogenic carbonate-marly units (growth strata) that predate the emplacement of mixed depositional systems during anticline uplift. Two stratigraphic units were identified and dated based on inoceramid biostratigraphy: the upper Podega Member (marly limestones with slump structures) and the Montesquiu Member (alternating limestones and marls). The upper Podega Member can be traced laterally southwest of the Sant Corneli Anticline, with thickness decreasing from approximately 230 m in the west to 170 m in the east. This unit exhibits meter- to decameter-scale soft-sediment deformation structures and syn-sedimentary faults, indicating gravitational collapse processes. Biostratigraphically, it spans from the upper Santonian to the basal upper Campanian (European bipartite subdivision). The overlying Montesquiu Member shows a similar west-to-east thinning trend, decreasing from about 226 m to 150 m. It is characterized by frequent intraformational unconformities and widespread soft-sediment deformation at meter- to decameter scale, reflecting active tectonism during deposition. Based on inoceramid assemblages, this unit is assigned to the middle-upper Campanian. It predates the development of shallower mixed depositional systems, which are only marginally affected by soft-sediment deformation structures.
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Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Inoceramids ; Paleontology ; Biostratigraphy ; Tremp basin ; Pyrenees ; Cretaceous
Publicat a:	Geologica acta, Vol. 24 (2026) (Carbonate successions from Iberia and the Caribbean - Homage to Ramon Salas) , ISSN 1696-5728

Adreça original: https://revistes.ub.edu/index.php/GEOACTA/article/view/49687
DOI: 10.1344/GeologicaActa2026.24.6

16 p, 20.8 MB

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