Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data
Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the sever...
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| Other Authors: | , |
| Format: | Doctoral or Postdoctoral Thesis |
| Language: | English |
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Universität Bremen
2016
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| Online Access: | https://media.suub.uni-bremen.de/handle/elib/1153 https://nbn-resolving.org/urn:nbn:de:gbv:46-00105638-17 |
| Summary: | Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the several ocean basins along the margins. The oldest amongst the basins along the West Gondwana margin -- presently the Eastern Africa passive margin -- are the Somali and Mozambique basins. The submarine morphological features of passive margins are dominated by downslope and along slope processes that are directly or indirectly controlled by tectonic, oceanic and climatic settings. The Mozambique Basin hosts a thick and continuous sequence of sediment archive from the Jurassic separation of Antarctica from Africa but despite its economic and geological significance, the region continues to remain poorly studied. This cumulative dissertation focuses on the evolution of the Mozambique Basin and its transition from a rift basin to a passive margin basin. 2200 km of seismic profiles and bathymetry data acquired in 2007 have been used to study the controls on sediment architecture and dispersal of sediments in the basin along the Mozambican continental margin. Additionally, palaeobathymetry models of the Africa-Antarctic Corridor using "backstripping" technique and plate kinematics augment our knowledge of the basin. The palaeobathymetry models show topographic highs along the edge of the basin namely, the continental margins, Mozambique, Gunnerus, Astrid ridges enclosed the basin preventing any bottom circulation until the Late Cretaceous. High sediment accumulation rates coupled with a euxinic setting in a rapidly subsiding basin results the formation of shale layers interbedded with turbidite layers. The present-day 1800 km long and 400 km wide Mozambique Fan is spread out in the Mozambique Channel. Local sea-level change and increased sediment influx due to tectonic activity into the basin from the Zambezi in Late Cretaceous ... |
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