Quaternary deep-water deposition in coastal basins of East Africa:characteristics,processes,and depositional model
The reserach on the deep-water area of the East African coastal basins mainly focuses on the deep strata with rich oil and gas ennrichment,and there is a lack of research on the Quaternary deep-water deposition.In this study,2D seismic data is used to study the deep-water deposition in Quaternary deep-water areas of Tanzania and Ruvuma Basin in East Africa.The sedimentary types are identified,the sedimentary units are divided,and the sedimentary model of deep-water deposition is established.The research shows that:(1)Deep-water gravity flow deposition,contour flow deposition and contour-gravity flow interaction deposition are developed in the study area,which are divided into four types of sedimentary units,namely canyon,channel,drifts and mass-transport composites.(2)The deep-water deposition in the study area displays obvious differences from north to south.The deep-water deposition in central Tanzania is large in scale,mainly developing gravity flow channels and mound-shaped drifts.Southern Tanzania has obvious canyon development,and has small-scale deep-water deposition overall.The deep-water deposition in northern Ruvuma is relatively large in scale,with canyons,channels and sheet-shaped drifts developed.(3)Due to the difference of submarine topography,the gravity flow energy of central Tanzania is relatively weak,while the gravity flow energy of southern Tanzania and northern Ruvuma are relatively strong.Limited by submarine geomorphology,contour flow deposition forms mound-shaped drifts in central Tanzania and sheet-shaped drifts in northern Ruvuma.The interaction between contour flow and gravity flow occurs in the south of central Tanzania,and lateral-migrating channels migrating southward are developed.
deep-water depositiongravity flowcontour flowinteractionQuaternaryEast Africa coast
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NSTL
万方数据
