Lago Mare and the Messinian Salinity Crisis: Evidence from the Alboran Sea (S. Spain) |
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| Institution: | 1. Dipartimento di Scienze della Terra, Università degli Studi di Torino, Torino, Italy;2. Institut für Geologie, Centrum für Erdsystemforschung und Nachhaltigkeit, Universität Hamburg, Hamburg, Germany;3. Institut für Chemie und Biologie des Meeres, Universität Oldenburg, Oldenburg, Germany;4. Department für Geodynamik und Sedimentologie, Universität Wien, Wien, Austria;1. Dipartimento di Scienze Chimiche e Geologiche, Università degli Studi di Modena e Reggio Emilia, Modena, Italy;2. Dipartimento di Fisica e Scienze della Terra, Università degli Studi di Parma, Parma, Italy;3. Department of Earth and Space Sciences, University of WA, Seattle, USA;1. University of Parma, Parma, Italy;2. ALP, Alpine Laboratory of Palaeomagnetism, Peveragno, CN, Italy;3. University of Turin, Turin, Italy;4. University of Modena and Reggio Emilia, Modena, Italy;5. Geological Survey of Israel, Jerusalem, Israel;6. Hebrew University, Jerusalem, Israel;1. Institute of Earth Sciences, University of Graz, NAWI Graz, Heinrichstrasse 26, A-8010 Graz, Austria;2. Department of Earth and Planetary Sciences, Rutgers University, 610 Taylor Road, Piscataway, NJ 08854-8066, United States;3. Department of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08901, United States;4. Geological-Paleontological Department, Natural History Museum Vienna, Burgring 7, A-1010 Vienna, Austria;5. Dipartimento di Scienze della Terra, Università degli Studi Torino, Via Valperga Caluso 35, I-10125 Torino, Italy |
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| Abstract: | This paper provides a new environmental, sedimentological and stratigraphic context of the Lago Mare deposits from the North Alboran region and clarifies their chronologic location with respect to the Messinian Salinity Crisis. We present new micropalaeontological data (dinoflagellate cysts, calcareous nannoplankton, planktonic foraminifers), correlated with field observations and offshore seismic interpretations. We show that the Lago Mare event known in three onshore localities (Río Mendelín near Malaga, Zorreras near Sorbas, Gafares near Níjar) follows the marine reflooding of the Mediterranean Basin which ended the Messinian Salinity Crisis. Chronologically, these Lago Mare deposits last from the latest Messinian to the early Zanclean. In fact, the first influx of Paratethyan organisms is revealed by the dinoflagellate cyst record from near Malaga within a Gilbert-type fan delta overlying the Messinian Erosional Surface. Invading molluscs and/or ostracods may have persisted in lagoonal coastal areas more or less affected by discontinuous marine influxes (Sorbas and Níjar). The Malaga area is convenient for a palaeogeographic and sedimentary reconstruction which shows the prevalent forcing of sea-level changes during the time-interval 5.600–5.332 Ma at the difference of the usually solicited prevalent tectonics. The studied Lago Mare event is the third episode resulting in such a palaeobiological assemblage in the Mediterranean region and corresponds to the final two-way water exchange at high sea level between the Mediterranean and the former Paratethys. It documents the onset of the modern marine circulation in the Mediterranean after the reflooding ending the Messinian Salinity Crisis. |
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| Keywords: | Dinoflagellate cysts Calcareous nannoplankton Lago Mare Alboran Sea Messinian Salinity Crisis Post-crisis reflooding |
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