The Messinian-early Pliocene stratigraphic record in the southern Bajo Segura Basin (Betic Cordillera, Spain): implications for the Mediterranean salinity crisis
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Title: | The Messinian-early Pliocene stratigraphic record in the southern Bajo Segura Basin (Betic Cordillera, Spain): implications for the Mediterranean salinity crisis |
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Authors: | Soria Mingorance, Jesús Miguel | Caracuel Martín, Jesús Esteban | Corbí, Hugo | Dinarès Turell, Jaume | Lancis Sáez, Carlos | Tent-Manclus, Jose Enrique | Viseras Alarcón, César | Yébenes Simón, Alfonso |
Research Group/s: | Cambios Paleoambientales | Evolución Geodinámica de la Cordillera Bética Oriental y de la Plataforma Marina de Alicante |
Center, Department or Service: | Universidad de Alicante. Departamento de Ciencias de la Tierra y del Medio Ambiente | Istituto Nazionale di Geofisica e Vulcanologia | Universidad de Granada. Departamento de Estratigrafía y Paleontología |
Keywords: | Stratigraphy | Magnetobiostratigraphy | Messinian | Pliocene | Salinity crisis | Mediterranean region |
Knowledge Area: | Estratigrafía | Paleontología |
Issue Date: | Jan-2008 |
Publisher: | Elsevier |
Citation: | SORIA MINGORANCE, Jesús Miguel, et al. "The Messinian-early Pliocene stratigraphic record in the southern Bajo Segura Basin (Betic Cordillera, Spain): implications for the Mediterranean salinity crisis". Sedimentary Geology. Vol. 203, Issues 3-4 (30 Jan. 2008). ISSN 0037-0738, pp. 267-288 |
Abstract: | The analysis of the Messinian and Pliocene stratigraphy of the southern Bajo Segura Basin (Betic Cordillera, Spain) has revealed three highstand sedimentary phases (Messinian I, Messinian II, and Pliocene) bounded by two lowstand erosional surfaces (intra-Messinian and end-Messinian unconformities). The Messinian I highstand phase is characterized by the progradation of coastal and shallow marine sandstones (La Virgen Fm) over slope and pelagic-basin marls (Torremendo Fm). After this first phase, a fall in sea level brought about the intra-Messinian unconformity, a subaerial erosional surface with local accumulations of karstic breccias and caliche-like carbonate crusts. The Messinian II highstand phase is represented by sandy beaches and muddy lagoons (Garruchal Fm) correlative with shallow marine evaporites (San Miguel Fm); this second phase records the intra-Messinian reflooding of the basin, which characterizes the salinity crisis in the marginal basins of the Mediterranean. A new sea-level fall resulted in the end-Messinian unconformity, of which the most significant feature is the presence of a broad palaeovalley, c. 200 m deep, which, along its course, completely eroded the deposits of the Messinian II phase and part of the deposits of the Messinian I phase. The Pliocene highstand phase begins with coastal and shallow marine conglomerates and sandstones (La Pedrera Fm) which fill the deep part of the above-mentioned palaeovalley. These bottom deposits evolved gradually upwards towards pelagic marls (Hurchillo Fm), over which shallow marine and coastal sandstones prograded (Rojales Fm). This third phase records the flooding of the basin at the beginning of the Pliocene, when the salinity crisis ended in the marginal basins of the Mediterranean. The combination of calcareous nannoplankton biostratigraphy and magnetostratigraphy has confirmed that both the end of the sedimentation of the Messinian I phase, as well as the two lowstand erosional surfaces (intra- and end-Messinian unconformities) and also the onset of the Pliocene phase occurred in the chron C3r (c. 5.9–5.2 Ma). Under the assumption of the classical model of a desiccated deep basin, either of the two aforementioned erosional surfaces, or even both, could be correlative with the evaporites deposited in the abyssal parts of the Mediterranean. |
Sponsor: | Financial aid was provided by Research Projects BTE2003-05047, CGL2005-06224/BTE, CGL2007-65832/BTE MEC, and GV04B-629 (Generalitat Valenciana) and the “Paleoenvironmental Changes” Group (UA). |
URI: | http://hdl.handle.net/10045/17227 |
ISSN: | 0037-0738 (Print) | 1879-0968 (Online) |
DOI: | 10.1016/j.sedgeo.2007.12.006 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.1016/j.sedgeo.2007.12.006 |
Appears in Collections: | INV - CP - Artículos de Revistas INV - GEODIN - Artículos de Revistas |
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