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2020-06-07

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/167520

10 Myr evolution of sedimentation rates in a deep marine to non-marine foreland basin system: tectonic and sedimentary controls (Eocene, Tremp-Jaca basin, Southern Pyrenees, NE Spain)

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https://doi.org/10.1111/bre.12481

Abstract

The propagation of the deformation front in foreland systems is typically accompanied by the incorporation of parts of the basin into wedge-top piggy-back basins, this process is likely producing considerable changes to sedimentation rates (SR). Here we investigate the spatialtemporal evolution of SR for the Tremp-Jaca Basin in the Southern Pyrenees during its evolution from a wedge-top, foreredeep, forebulge configuration to a wedge-top stage. SR were controlled by a series of tectonic structures that influenced subsidence distribution and modified the sediment dispersal patterns. We compare the decompacted SR calculated from 12 magnetostratigraphic sections located throughout the Tremp-Jaca Basin represent the full range of depositional environment and times. While the derived long-term SR range between 9.0 and 84.5 cm/kyr, compiled data at the scale of magnetozones (0.1 to 2.5 Myr) yield SR that range from 3.0 to 170 cm/kyr. From this analysis three main types of depocenter are recognized: a regional depocenter in the foredeep depozone; depocenters related to both regional subsidence and salt tectonics in the wedge-top depozone; and a depocenter related to clastic shelf building showing transgressive and regressive trends with graded and non-graded episodes. From the evolution of SR we distinguish two stages. The Lutetian Stage (from 49.1 to 41.2 Ma) portrays a compartmentalized basin characterized by variable SR in dominantly underfilled accommodation areas. The markedly different advance of the deformation front between the Central and Western Pyrenees resulted in a complex distribution of the foreland depozones during this stage. The Bartonian-Priabonian Stage (41.2 to 36.9 Ma) represents the integration of the whole basin into the wedge-top, showing a generalized reduction of SR in a mostly overfilled relatively uniform basin. The stacking of basement units in the hinterland during the whole period produced unusually high SR in the wedge-top depozone.

Subject

Sedimentologia, Paleomagnetisme, Estratigrafia seqüencial, Tectònica salina, Pirineus

Subject (English)

Sedimentology, Paleomagnetism, Sequence stratigraphy, Tectonique du sel, Pyrenees

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Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

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VINYOLES I BUSQUETS, Andreu, et al. 10 Myr evolution of sedimentation rates in a deep marine to non-marine foreland basin system: tectonic and sedimentary controls (Eocene, Tremp-Jaca basin, Southern Pyrenees, NE Spain). Basin Research. 2020. ISSN 0950-091X. [consulted: 14 of August of 2026]. Available at: https://hdl.handle.net/2445/167520

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