The Bajo Segura Basin (SE Spain): implications for the Messinian salinity crisis in the Mediterranean margins

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Title: The Bajo Segura Basin (SE Spain): implications for the Messinian salinity crisis in the Mediterranean margins
Authors: Soria Mingorance, Jesús Miguel | Caracuel Martín, Jesús Esteban | Corbí, Hugo | Dinarès Turell, Jaume | Lancis Sáez, Carlos | Tent-Manclus, Jose Enrique | 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
Keywords: Bajo Segura Basin | Messinian salinity crisis | Stratigraphy
Knowledge Area: Estratigrafía | Paleontología
Issue Date: 2008
Publisher: Micropaleontology Press
Citation: SORIA MINGORANCE, Jesús Miguel, et al. "The Bajo Segura Basin (SE Spain): implications for the Messinian salinity crisis in the Mediterranean margins". Stratigraphy. Vol. 5, No. 3-4 (2008). ISSN 1547-139X, pp. 257-263
Abstract: The analysis of the Messinian and Pliocene stratigraphy of the Bajo Segura Basin (a marginal basin of the western Mediterranean) has revealed three synthems deposited in a high sea-level context: T-MI (late Tortonian-Messinian), MII (Messinian), and P (early Pliocene), bounded by two lowstand erosional surfaces (intra-Messinian and end-Messinian unconformities). With respect to the salinity crisis, we propose the following series of events: 1) pre-evaporitic or pre-crisis phase (T-MI synthem); 2) first sea-level fall and subaerial exposure (intra-Messinian unconformity), possibly related to the precipitation of the Lower Evaporites; 3) syn-evaporitic phase (MII synthem), recorded both by selenitic gypsum (Upper Evaporites) as well as by lagoon deposits (Lago-Mare); 4) second sea-level fall and subaerial exposure (end-Messinian unconformity), characterized by deeply incised palaeovalleys; and 5) postevaporitic or post-crisis phase (P synthem), which coincides with the definitive restoration of open marine conditions in the basin. A combined biostratigraphic and magnetostratigraphic study revealed that all the events linked to the salinity crisis (from the end of the pre-evaporitic phase to the beginning of the post-evaporitic phase) occurred within the chron C3r (c. 5.9-5.2 Ma).
Sponsor: Financial aid was provided by Research Projects BTE2003-05047, CGL2005-06224BTE (MEC), CGL2007-65832/BTE (MEC), GV04B-629 (Generalitat Valenciana) and “Paleoenvironmental Changes” Group (UA).
ISSN: 1547-139X
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
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