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Basement Geometry and Cover-Basement Relationships in the Central-Western Jaca-Pamplona Basin (Southern Pyrenees): Along-Strike Variations and Role of Structural Inheritance
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DOI：10.1029/2025TC009254.png)
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Abstract
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This study presents a detailed, geometrical characterization of the central-western domain of the Jaca-Pamplona Basin based on a combined interpretation of seismic and surface data and the construction of four serial cross-sections. For the studied portion of the basin, our results highlight that the basement is notably folded and faulted and its overall geometry is strongly controlled by the reactivation and spatial distribution of inherited, Permian-Triassic extensional faults. Basement-involved thrusts define a non-cylindrical thrust system and a prominent thrust salient bounded by NE-SW and NW-SE striking oblique structures to the east and west, respectively. South of the salient, seismic profiles reveal a newly identified basement structure beneath the South Pyrenean frontal thrust, which folds and uplifts outcropping structures in its hanging wall. Across the central-western part of the Jaca-Pamplona Basin, basement thrusts show an upper detachment along Triassic evaporites, transferring displacement forward into the cover succession and deforming previously developed thrust flats along the evaporites. Basement thrusts propagated forward probably from the late Ypresian, although synchronous activity in the southern structural units is documented during the Oligocene. Together with recent studies in the central and eastern Jaca-Pamplona Basin, this study provides a regional- and basin-scale picture of the geometry of basement units and places new constraints on the along-strike variations of main structures, their timing and related shortening and vertical axis rotations.
Keywords:
Pyrenees
Jaca-Pamplona basin
fold-and-thrust systems
basement
inheritance
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