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The architecture of the lower parts of submarine canyons on the western Nigerian continental margin

Acta Oceanologica Sinica 2018年第7期37卷 28-40页

作者： JIMOH Rasheed Olayinka TANG yong LI Jiabiao awosika lar.y folajimi LI He AKINNIGBAGE Edward Akintoye ADELEyE Adedayo Oluwaseun Ocean College Zhejiang UniversityZhoushan 316021China Second Institute of Oceanography State Oceanic AdministrationHangzhou 310012China Key Laboratory Submarine Geosciences State Oceanic AdministrationHangzhou 310012China Nigerian Institute for Oceanography and Marine Research Lagos PMB 12729Nigeria Commission on the Limits of the Continental Shelf C/O Division of Ocean Affairs and Law of the SeaNew York 11101USA

Multi-beam,sub-bottom and multichannel seismic data acquired from the western Nigerian continental margin are analysed and interpreted to examine the architectural characteristics of the lower parts of the submarine canyons on the *** presence of four canyons： Avon,Mahin,Benin,and Escravos,are confirmed from the multi-beam data map and identified as cutting across the shelf and slope areas,with morphological features ranging from axial channels,moderate to high sinuosity indices,scarps,terraces and nickpoints which are interpreted as resulting from erosional and depositional activities within and around the *** Avon Canyon,in particular,is characterised by various branches and sub-branches with complex *** canyons are mostly U-shaped in these lower parts with occasional V-shapes down their *** typical orientation is NE–*** processes are proposed as being a major controlling factor in these *** appear to have been discharged directly into the canyons by rivers during the late Quaternary low sea level which allows river mouths to extend as far as the shelf *** current sediment supply is still primarily sourced from these rivers in the case of the Benin and Escravos Canyons,but indirectly in the case of the Avon and Mahin Canyons where the rivers discharge sediments into the lagoons and the lagoons bring the sediments on to the continental shelf before they are dispersed into the canyon *** canyons that have long been buried underneath the Avon Canyon are identified in the multichannel seismic profile across the head of the Avon Canyon,while a number of normal faults around the walls of the Avon and Mahin Canyons are observed in the selected sub-bottom *** occurrence of these faults,especially in the irregular portions of the canyon walls,suggests that they also have some effect on the canyon *** formation of the canyons is attributed to the exposure of the upper margina

关键词： western Nigerian continental margin submarine canyons architecture controlling factors sedimentary processes tectonic evolution

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