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Abstract
Triassic Keuper evaporites have long been recognized as the main detachment level for thrusting in the Pyrenean fold–thrust belts. The deformed Late Cretaceous–Eocene foreland basin of the Southern Pyrenees has structures and stratal geometries that can be interpreted as related to salt tectonics (e.g. unconformities, rapid thickness variations, long-lived growth fans and overturned flaps), although they have been overprinted by shortening and thrusting. Based on field observations and published maps, we build new structural cross-sections reinterpreting two classic transects of the Southern Pyrenees (Noguera Ribagorçana and Noguera Pallaresa river transects). The sequential restoration of the sections explores the variations in structural style, addressing the role of halokinesis in the tectonic and sedimentary development. In the Serres Marginals area, we propose that salt pillows and diapirs started developing locally during the Mesozoic pre-orogenic episode, evolving into a system of salt ridges and intervening synclines filled with early synorogenic sediments. Rapid amplification of folds recorded by widespread latest Cretaceous–Paleocene growth strata is taken as marking the onset of contractional folding in the area. During Pyrenean compression, folding mechanisms transitioned from dominantly halokinetic to a combination of buckling and differential sedimentary loading. Squeezing of salt diapirs and thrust welding occurred as salt ridges were unroofed. We provide new field observations that lead to a reinterpretation of the regional structural development and contribute to the debate about the role of salt tectonics in the Pyrenees.
Original language | English |
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Article number | jgs2020-085 |
Journal | Journal of the Geological Society |
Volume | 178 |
Issue number | 4 |
DOIs | |
Publication status | Published - Jul 2021 |
Keywords
- Boada
- Oblique synclines of Sant Jordi
- Rubió and Montsonís
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Dive into the research topics of 'Contractional salt tectonics and role of pre-existing diapiric structures in the Southern Pyrenean foreland fold–thrust belt (Montsec and Serres Marginals)'. Together they form a unique fingerprint.Projects
- 2 Finished
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Registro de la extensión y la contracción en cadenas de montañas y cuentas periféricas: una aproximación tectónica, sedimentaria y de geofluidos
Teixell Cacharo, A. (Principal Investigator), Fernández Terrones, N. (Collaborator), Hudec, M. (Collaborator), Labaume, P. (Collaborator), Ayarza Arribas, P. (Investigator), Gomez Gras, D. M. (Investigator), Griera Artigas, A. (Investigator), Coll Carrillo, X. (Collaborator), Caldera Grau, N. (Collaborator), Barnolas Cortinas, A. (Collaborator), Carrión Jiménez, M. (Collaborator) & Madariega Churruca, A. (Collaborator)
Spanish Ministry of Science and Innovation
1/01/19 → 30/09/22
Project: Research Projects and Other Grants
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Del rifting al crecimiento orogénico en los orógenos de inversión. Indicadores tectónicos,sedimentarios i geomorfológicos
Teixell Cacharo, A. (Principal Investigator), Barnolas Cortinas, A. (Collaborator), Boya Duocastella, S. (Collaborator), Roige Taribo, M. (Collaborator), Ruiz Amaya, J. C. (Collaborator), Struth Izquierdo, L. (Collaborator), Arboleya Cimadevilla, M. L. (Investigator), Ayarza Arribas, P. (Investigator), Babault , J. (Investigator), Gomez Gras, D. M. (Investigator), Griera Artigas, A. (Investigator), Jolivet, M. (Investigator), Labaume, P. (Investigator), Mora, A. (Investigator), Owen, L. (Investigator), Rosales Franco, I. (Investigator) & Stockli, D. (Investigator)
Spanish Ministry of Economy and Competitiveness (MINECO)
1/01/15 → 31/12/18
Project: Research Projects and Other Grants