Please use this identifier to cite or link to this item: https://dspace.univ-ouargla.dz/jspui/handle/123456789/27983
Title: Paleoenvironmental evolution in the late Neogene Lower Chelif basin based on benthic foraminifera (North-western Algeria)
Authors: Benzina, Mostapha
Boughaba , Milouda Sara
Maabdi, Souad
Keywords: Benthic foraminifera
Messinian
pre-evaporitic
reconstruction
conditions
paleoenvironmental
Issue Date: 2020
Abstract: The study of benthic foraminifera from the Messinian pre-evaporitic interval of Djebel Meni section (Northern west) allowed the reconstruction of surface and bottom-water conditions in the West Mediterranean during the interval that preceding the Messinian Salinity Crisis. Our data point out to three-steps paleoenvironmental evolution. During the first stagepresents an assemblage with high diversity of benthic foraminifera. This features materialized by the dominance of the oxyphilic taxa, a well-ventilated bottom-water conditions beside a considerable bathymetric and well exchanges of ocean water with and into Chelif basin. During that period, this interval is consideredasan outer shelf to slope environment. The second stage corresponds to the middle part of the section. It refersto moderate decrease of oxygen content which seems to be the main factor that leads to this stage, since the diversity of benthic foraminifera species decreases. Where the third stage witnessed rapid decrease in number of taxa corresponding to the upper part of the section with a common presence of barrens intervals of benthic foraminifera. This interval is dominated by the stress-tolerant taxa Bolivinaspp, Buliminaspp and Rectuvigerinasppgenus as dyoxic species with high salinity conditions. The interval refers to a oxygen depletion that probably caused by the restriction of Mediterranean water exchanges contributing to the stagnation of bottom water as shallowing environment referring to inner to middle shelf.
Description: PEOPLE’S DEMOCRATIC REPUBLIC OF ALGERIA MINISTRY OF HIGHER EDUCATION AND SCIENTIFIC RESEARCH KASDI MERBEH UNIVERSITY_OUARGLA FACULTY OF HYDROCARBON, RENEWABLE ENERGIES AND EARTH SCIENCES DEPARTMENT OF EARTH SCIENCES (GEOLOGY)
URI: http://dspace.univ-ouargla.dz/jspui/handle/123456789/27983
Appears in Collections:Département des Sciences de la terre et de l’Univers - Master

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