Sediment Dynamics off the East African Continental Margin during the Last Deglaciation and the Holocene: Constrained by Changes in Climate and Sea Level
File | Description | Size | Format | |
---|---|---|---|---|
00104152-1.pdf | 16.93 MB | Adobe PDF | View/Open |
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 | Experts: | 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 | Type: | Dissertation | Secondary publication: | no | URN: | urn:nbn:de:gbv:46-00104152-12 | Institution: | Universität Bremen | Faculty: | Fachbereich 05: Geowissenschaften (FB 05) |
Appears in Collections: | Dissertationen |
Google ScholarTM
Check
Items in Media are protected by copyright, with all rights reserved, unless otherwise indicated.