The Early Pliocene reflooding in the Western Mediterranean: New insights from the rias of the Internal Rif,Morocco |
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Institution: | 1. Géosciences Montpellier, UMR CNRS 5243, université Montpellier, 2, place Eugène-Bataillon, CC 060, 34095 Montpellier cedex 05, France;2. National Institute of Marine Geology and Geo-ecology (GEOECOMAR), Bucharest, Romania;3. Département de géologie, université Abdelmalek-Esaadi, 93003 Tetuán, Morocco;4. Laboratoire de géologie de Lyon : Terre, planètes, environnement, UMR CNRS 5276, Université Lyon-1, 27–43, boulevard du 11-Novembre-1918, 69622 Villeurbanne cedex, France;5. National and Kapodistrian University of Athens, Faculty of Geology and Geoenviromment, Athens, Greece;7. Institut des sciences de l’Évolution (UM2-CNRS 5554), CC 061, Université Montpellier, 2, place Eugène-Bataillon, 34095 Montpellier cedex 5, France;8. Laboratoire Géoazur, université Nice – Sophia Antipolis, 06560 Nice, France;9. Laboratoire Biodiversité et dynamique des écosystèmes, université Cadi Ayyad, Faculté des Sciences Semlalia, boulevard Prince-Moulay-Abdelah, Marrakech, Morocco |
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Abstract: | New field and micropalaeontological investigations have been conducted in four of the Pliocene rias of the internal zone of the Rif in Morocco, on the southern margin of the Alboran Sea. We found that marine sediments outcropping in these rias were deposited mainly during the Early Zanclean, between 5.04 and 3.8 Ma. After a transgressive episode that led to the deposition of terrestrial to marine conglomerates, dark clays deposited first at shallow palaeo-depths and then at bathyal palaeo-depths. The rias were then infilled with a shallowing upward succession comprising marine clays and sandstone and, locally, terrestrial sediments that indicate their final emersion. No Gilbert-deltas were observed in these rias. The presence of transgressive deposits at the bottom of the rias, also identified in other basins of the external zone of the Rif, and the absence of Gilbert deltas question a catastrophic reflooding after the Messinian Salinity Crisis in this area. |
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Keywords: | Zanclean Alboran Sea Morocco Rias Depositional geometries Biostratigraphy Reflooding Mediterranean |
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