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<title lang=en>Origin of the large Pliocene and Pleistocene debris flows on the Algarve margin</title>
<creator>Ducassou, E.</creator>
<creator>Fournier, L.</creator>
<creator>Sierro, F. J.</creator>
<creator>Alvarez Zarikian, Carlos A.</creator>
<creator>LOFI, Johanna</creator>
<creator>Flores, J. A.</creator>
<creator>Roque, C.</creator>
<contributor>UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) ; Observatoire aquitain des sciences de l'univers (OASU) ; Université Sciences et Technologies - Bordeaux 1 - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Université Sciences et Technologies - Bordeaux 1 - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - École pratique des hautes études (EPHE) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Universidad de Salamanca</contributor>
<contributor>Texas A&M University [College Station]</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Transferts en milieux poreux ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Univ. de Salamanca,</contributor>
<contributor>IPMA, Divisão de Geologia Marinha e Georrecursos, Lisbon</contributor>
<description>International audience</description>
<source>ISSN: 0025-3227</source>
<source>Marine Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-01356172</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01356172</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01356172</source>
<source>Marine Geology, Elsevier, 2016, 377, pp.58-76. 〈10.1016/j.margeo.2015.08.018〉</source>
<identifier>DOI : 10.1016/j.margeo.2015.08.018</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.margeo.2015.08.018</relation>
<language>en</language>
<subject lang=en>Debrite</subject>
<subject lang=en>Algarve margin</subject>
<subject lang=en>Plio-pleistocene</subject>
<subject lang=en>Foraminiferal assemblages</subject>
<subject lang=en>Ostracods</subject>
<subject lang=en>Erosion</subject>
<subject>[SDU.STU.OC] Sciences of the Universe [physics]/Earth Sciences/Oceanography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The base of the Faro contouritic drift (IODP Site U1386) on the northern margin of the Gulf of Cádiz (Algarve margin) is characterized by two sequences of frequent gravity deposits with different ages and compositions. Among these gravity deposits, several relatively thick debrites (up to 12 m) have been observed and studied in detail.Sedimentological analyses have been performed and because of non-turbulent behavior of debris flows, detailed micropaleontological studies could be realized. Planktonic foraminifera thus allowed establishing a detailed biostratigraphy of these deposits. Benthic foraminifer and ostracod assemblages were used to evaluate the origin of the sediment composing these debris flows and estimate their run-out distance.These debrites are dated from Early Pliocene and early Pleistocene, and were deposited in a mesobathyal environment. They comprise silty mud clasts and matrixes with sand content up to 34%. The Early Pliocene debrites are bioclast-rich whereas the Early Pleistocene debrite is enriched in terrigenous particles. The data indicates that these debrites were triggered on the continental shelf and traveled less than 100 km, eroding the seafloor all along their path for the Early Pliocene debrites and only the first part of their path for the early Pleistocene debrite. Matrixes originate from failure areas whereas eroded sediments along the flow pathway are incorporated into the flow as clasts.High abundance of shelf fauna during the Early Pliocene and great supply of terrigenous particles from rivers during the early Pleistocene in the south-western Iberian margin have favored gravity flows from the continental shelf to the slope. The contouritic paleo-moat of the Faro drift has been a determining channeling feature for gravity flows along the Algarve margin during the early Pleistocene, testifying of the strong interaction between MOW circulation and down-slope processes. Tectonic and diapiric activities were significant during Early Pliocene and early Pleistocene on the Algarve margin and could have been triggering parameters of failures related to these debris flows.</description>
<date>2016-07-01</date>
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