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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 | Journal: | Stratigraphy | Series/Report no.: | 3-4 / 5 (2008) | Publisher: | Micropaleontology Press | Issue Date: | Dec-2008 | Keywords: | Messinian Salinity Crisis Evaporites Betic |
Subject Classification: | 04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism |
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). |
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