Sedimentology and depositional architecture of a submarine delta-fan complex in the Durban Basin,South Africa |
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| Institution: | 1. Council for Geoscience, 139 Jabu Ndlovu Street, Pietermaritzburg 3200, South Africa;2. Discipline of Geological Sciences, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Westville, Private Bag X54001, South Africa;1. School of Earth Sciences and Engineering, Nanjing University, 210046 Nanjing, Jiangsu, China;2. College of Science, Earth Science Department, Sultan Qaboos University, PO Box 36, Oman;3. The 1st Geology Survey of Tibet, 851400 Lhasa, Tibet, China;4. Institute of Sedimentary Geology, Chengdu University of Technology, 610059 Chengdu, China;1. Council for Geoscience, 139 Jabu Ndlovu Street, Pietermaritzburg 3200, South Africa;2. Discipline of Geological Sciences, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Westville, Private Bag X54001, South Africa;1. Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences, Wuhan, 430074, China;2. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan, 430074, China;3. Radiogenic Isotope Facility, School of Earth and Environmental Sciences, The University of Queensland, Brisbane, Qld, 4072, Australia;4. PetroChina Research Institute of Petroleum Exploration & Development, Beijing, 100083, China;5. Southern Exploration and Development Company, Sinopec, Chengdu, 610041, China;6. Zhanjiang Branch Company, China National Offshore Oil Corporation, Zhanjiang, 524057, China |
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| Abstract: | The seismic stratigraphy, evolution and depositional framework of a sheared-passive margin, the Durban Basin, of South East Africa are described. Based on single-channel 2D seismic reflection data, six seismic units (A-F) are revealed, separated by major sequence boundaries. These are compared to well logs associated with the seismic data set. Internal seismic reflector geometries and sedimentology suggest a range of depositional regimes from syn-rift to upper slope and outer shelf. Nearshore and continental facies are not preserved, with episodic shelf and slope sedimentation related to periods of tectonic-induced base level fall. The sedimentary architecture shows a change from a structurally defined shelf (shearing phase), to shallow ramp and then terminal passive margin sedimentary shelf settings. Sedimentation occurred predominantly during normal regressive conditions with the basin dominated by the progradation of a constructional submarine delta (Tugela Cone) during sea-level lowstands (LST). The earlier phases of sedimentation are tectonic-controlled, however later stages appear to be linked to global eustatic changes. |
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| Keywords: | Sequence stratigraphy Shelf edge Delta Rift basins |
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