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Citation link: http://nbn-resolving.de/urn:nbn:de:gbv:46-00104091-19
00104091-1.pdf
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How magnetics and granulometry of continental margin sediments reflect terrestrial and marine environments of South America and West Africa


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Other Titles: Wie Magnetismus und Granulometrie von Kontinentalrand-Sedimententen terrestrische und marine Umweltbedingungen Südamerikas und Westafrikas reflektieren
Authors: Razik, Sebastian 
Supervisor: von Dobeneck, Tilo
1. Expert: von Dobeneck, Tilo
2. Expert: Chiessi, Cristiano M. 
Abstract: 
Continental margins are supplied by terrigenous clastic, as well as by biogenic marine sediments and, thus, act as natural archives for various environmental conditions. This thesis delineates sediment-distribution patterns off SE South America (20-55 deg. S) and NW Africa (14-17 deg. N) mainly based on rock-magnetic properties supplemented by clastic grain-size distributions, major-element concentrations, planktic and benthic foraminiferal assemblages, as well as stable-isotope signatures obtained from surface and down-core sediment samples. These investigations, spanning the last 19 kyr, reveal insights about prevalent climatic conditions on land (i.e., intensities of South American Monsoon System&Southern Westerly Wind Belt, or North-African Harmattan&trade winds) with impacts on major terrestrial sediment sources and transport paths. However, they also enable to draw conclusions about marine environmental conditions linked to ocean-current systems (i.e., Brazil&Malvinas Currents).
Keywords: environmental magnetism, granulometry, multi proxy, sediment provenance, sediment transport, South America, South American Monsoon System, Southern Westerly Wind Belt, West Africa, trade winds, Harmattan wind, Brazil Current, Malvinas Current, Subtropical Shelf Front
Issue Date: 7-Nov-2014
Type: Dissertation
URN: urn:nbn:de:gbv:46-00104091-19
Institution: Universität Bremen 
Faculty: FB5 Geowissenschaften 
Appears in Collections:Dissertationen

  

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