2024-03-28T19:51:07Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1721452022-12-20T13:00:57Zcom_10261_82com_10261_8com_10261_262578col_10261_335col_10261_262579
Pérez-Asensio, José Noel
Larrasoaña, Juan C.
Samankassou, E.
Sierro, Francisco Javier
García-Castellanos, Daniel
Jiménez-Moreno, G.
Salazar Rincón, Ángel Enrique
Salvany, J. M.
Ledesma, S.
Mata Campo, Maria Pilar
Civis Llovera, Jorge
Mediavilla Laso, Carlos
2018-11-13T10:25:20Z
2018-11-13T10:25:20Z
2018-11
Bulletin of the Geological Society of America, 130(11-12): 1791-1808 (2018)
0016-7606
http://hdl.handle.net/10261/172145
10.1130/B31892.1
1943-2674
http://dx.doi.org/10.13039/501100002809
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100011011
The Gibraltar Arc is a complex tectonic region, and several competing models have been proposed to explain its evolution. We studied the sedimentary fill of the Guadalquivir Basin to identify tectonic processes that were occurring when the reopening of the Strait of Gibraltar led to the reestablishment of Mediterranean outflow. We present a chronostratigraphic framework for the Lower Pliocene sediments from the lower Guadalquivir Basin (SW Spain). The updated chronology is based on magnetobiostratigraphic data from several boreholes. Our results show that the studied interval in the La Matilla core is in the early Pliocene section, providing better constraints on the sedimentary evolution of the basin during that period. Migrating depositional facies led to a younger onset of sandy deposition basinward. At the northwestern passive margin, a 0.7 m.y. period of sedimentary bypass related to a sharp decrease in sedimentation rates and lower sea levels resulted from the tectonic uplift of the forebulge. In contrast, high sedimentation rates with continuous deep-marine sedimentation are recorded at the basin center due to continuous tectonic subsidence and west-southwestward progradation of axial depositional systems. The marginal forebulge uplift, continuous tectonic basinal subsidence, and southward progradation of clinoforms in the early Pliocene can be explained by the pull of a lithospheric slab beneath the Gibraltar Arc as the Strait of Gibraltar opened. These findings are, to our knowledge, the first reported sedimentary expression of slab pull beneath the Betics related to the opening of the Strait of Gibraltar after the Messinian salinity crisis. © 2018 Geological Society of America.
eng
openAccess
Sea level
Sedimentation
Sedimentology
Stratigraphy
Submarine geology
Subsidence
Depositional system
Magnetobiochronology
Messinian salinity crisis
Pliocene sediments
Sedimentary evolution
Sedimentation rates
Strait of Gibraltar
Tectonic evolution
Magnetobiochronology of Lower Pliocene marine sediments from the lower Guadalquivir Basin: Insights into the tectonic evolution of the Strait of Gibraltar area
artículo