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Authors: Soria, J. M.*
Caracuel, J. E.*
Corbí, H.*
Dinarès-Turell, J.*
Lancis, C.*
Tent-Manclús, J. E.*
Yébenes, A.*
Title: The Bajo Segura Basin (SE Spain): implications for the Messinian Salinity Crisis in the Mediterranean margins
Title of journal: Stratigraphy
Series/Report no.: 3-4 / 5 (2008)
Publisher: Micropaleontology Press
Issue Date: Dec-2008
Keywords: Messinian Salinity Crisis
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).
Appears in Collections:04.05.06. Paleomagnetism
04.04.10. Stratigraphy
Papers Published / Papers in press

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