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<identifier>oai:HAL:hal-00424533v1</identifier>
<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>The long-term evolution of the Congo deep-sea fan: A basin-wide view of the interaction between a giant submarine fan and a mature passive margin (ZaiAngo project)</title>
<creator>Anka, Z.</creator>
<creator>Seranne, Michel</creator>
<creator>Lopez, Michel</creator>
<creator>Scheck-Wenderoth, M.</creator>
<creator>Savoye, B.</creator>
<contributor>GeoForschungsZentrum - Helmholtz-Zentrum Potsdam (GFZ)</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>
<source>ISSN: 0040-1951</source>
<source>EISSN: 1879-3266</source>
<source>Tectonophysics</source>
<publisher>Elsevier</publisher>
<identifier>hal-00424533</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00424533</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00424533</source>
<source>Tectonophysics, Elsevier, 2009, 470 (1-2), pp.42-56. 〈10.1016/j.tecto.2008.04.009〉</source>
<identifier>DOI : 10.1016/j.tecto.2008.04.009</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.tecto.2008.04.009</relation>
<language>en</language>
<subject lang=en>West Africa Margin</subject>
<subject lang=en>Angola escarpment</subject>
<subject lang=en>Salt tectonics</subject>
<subject lang=en>Submarine canyon</subject>
<subject lang=en>Lower Congo basin</subject>
<subject lang=en>Submarine fan</subject>
<subject>[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>We have integrated the relatively unknown distal domains of the Lower Congo basin, where the main depocenters of the Congo submarine fan are located, with the better-constrained successions on the shelf and upper slope, through the analysis of thousands of km of 2D seismic reflection profiles off-shore the Congo-Angola passive margin. The basin architecture is depicted by two ca. 800-km-long regional cross sections through the northern (Congo) and southern (Angola) margin. A large unit deposited basinward of the Aptian salt limit is likely to be the abyssal-plain equivalent of the upper-Cretaceous carbonate shelf that characterized the first post-rift deposits in West-equatorial African margins. A latest-Turonian shelf-deepening event is recorded in the abyssal plain as a long period (Coniacian-Eocene) of condensed sedimentation and basin starvation. The onset of the giant Tertiary Congo deep-sea fan in early Oligocene following this event reactivates the abyssal plain as the main depocenter of the basin. The time-space partitioning of sedimentation within the deep-sea fan results from the interplay among increasing sediment supply, margin uplift, rise of the Angola salt ridge, and canyon incision throughout the Neogene. Oligocene-early Miocene turbidite sedimentation occurs mainly in NW-SE grabens and ponded inter-diapir basins on the southern margin (Angola). Seaward tilting of the margin and downslope salt withdrawal activates the up-building of the Angola escarpment, which leads to a northward (Congo) shift of the transfer zones during late Miocene. Around the Miocene-Pliocene boundary, the incision of the Congo submarine canyon confines the turbidite flows and drives a general basinward progradation of the submarine fan into the abyssal plain The slope deposition is dominated by fine-grained hemipelagic deposits ever since. Results from this work contribute to better understand the signature in the ultra-deep deposits of processes acting on the continental margin as well as the basin-wide sediment redistribution in areas of high river input.</description>
<date>2009</date>
</dc>
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