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- W2894286541 abstract "The Mozambique margin is an oblique to transform margin which houses one of thelargest African turbiditic system (1800 km long and 400km wide) (Droz and Mougenot., AAPGBull., 1987). The turbiditic system is related to the Zambezi delta which recorded more than12km of sediments deposits with little destabilizations. In the onshore area, the water catchmentand the drainage system have been changed through geological times by rivers captures(Thomas and Shaw., J.Afr.Earth Sci., 1988).Since a few years several studies were realised along the central African margins whichled to numerous interpretations, especially on timing of events liked to the lack of a strong agemodel. The aim of this study is to carry out a source to sink approach along the Mozambiquemargin and to discuss its evolution since Early Cretaceous times. Within the framework of thePamela project, a new set of acquisition cruise and data analysis was realised. A biostratigraphyrevaluation of wells along the Mozambique shelf combined to a resampling and new datationof Zambezi 3 well provided new ages constraints that we correlated to existing and new Pamelaseismic reflexion data.Using this new data set we propose to: 1) realise a new age model of the Mozambicanmargin since early Cretaceous times, 2) analyse the infill evolution from the Zambezi delta tothe deep turbiditic system using isopach maps to recognize its different steps of growth.1) Late Jurassic (?) - early Late Cretaceous: from Neocomian to Aptian times, the high of theclinoforms is getting higher, with the first occurrence of contouritic ridges during Cenomaniantimes.2) Late Cretaceous - Early Paleocene: a major drop of relative sea-level occurred as a consequenceof the South African Plateau uplift. The occurrence of two depocenters suggests siliciclasticsupplies from the Bushveld and from the North Mozambique domain.3) Early Paleocene - Eocene: growth of carbonate platforms and large contouritic ridges.4) Oligocene - Present-day: birth of the modern Zambezi Delta, with quite low siliciclasticsupply during Oligocene times, increasing during Miocene times linked to the East Africansystem. As previously expected (Droz and Mougenot) some sediments are coming from afeeder located east of the Davie Ridge.This study was financed by TOTAL and Ifremer in the scientific project PAMELA (Passive MarginExploration Laboratories) framework" @default.
- W2894286541 created "2018-10-05" @default.
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- W2894286541 date "2016-11-30" @default.
- W2894286541 modified "2023-10-03" @default.
- W2894286541 title "THE ZAMBEZI SEDIMENTARY SYSTEM:A SOURCE TO SINK APPROACH" @default.
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