Sediment Dynamics off the East African Continental Margin during the Last Deglaciation and the Holocene: Constrained by Changes in Climate and Sea Level
|Other Titles:||Sedimentdynamik am ostafrikanischen Kontinentalrand bezüglich Klima- und Meeresspiegeländerungen für die letzte Enteisungsphase und das Holozän||Authors:||Liu, Xiting||Supervisor:||Henrich, Rüdiger||1. Expert:||Henrich, Rüdiger||2. Expert:||Bohrmann, Gerhard||Abstract:||
This thesis focused on sediment dynamics on the East African continental margin and their response to paleoclimatic and sea-level changes on a millennial time scale during the last deglaciation and Holocene. High-resolution Holocene sedimentary records (core GeoB12605-3) from the continental shelf off Tanzania indicate that that there has been a shift in the sedimentation regime during the past 10 ka. During the early Holocene, when climate was humid, sediments were dominated by the allochthonous, fine-grained clay minerals transported by river mouth bypassing. In contrast, during the arid, late Holocene, sediments were dominated by the autochthonous, reworked, coarse-grained quartz and feldspars resulting from shoreface bypassing. For the slope environment, the Rufiji turbidite deposits (core GeoB12624-1) are mainly composed of quartz sand. The turbidity currents were most active during the last sea-level transgression and highstand, when a more humid climate prevailed. Thus, it is the climate conditions of the hinterland that form the primary controlling factor in this environment.
|Keywords:||East Africa, African Humid Period, Sediment dynamics, Continental margin Holocene, Turbidite||Issue Date:||18-Dec-2014||URN:||urn:nbn:de:gbv:46-00104152-12||Institution:||Universität Bremen||Faculty:||FB5 Geowissenschaften|
|Appears in Collections:||Dissertationen|
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