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Citation link: http://nbn-resolving.de/urn:nbn:de:gbv:46-diss000112883
00011288.pdf
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Laser ablation ICP-MS in paleoceanography: A regional study on the benthic foraminifer Oridorsalis umbonatus in the Benguela Upwelling Area off Namibia


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Other Titles: Laserablations ICP-MS in der Paläozeanographie: Eine regionale Studie an der benthischen Foraminiferenart Oridorsalis umbonatus im Benguela Auftriebsgebiet vor Namibia
Authors: Rathmann, Söhnke 
Supervisor: Mulitza, Stefan  
1. Expert: Wefer, Gerold  
Experts: Mackensen, Andreas  
Abstract: 
Benthic foraminiferal species colonize wide areas of the ocean floor and are widely used in paleoceanography. In paleoceanography it is important to continuously develop and refine proxies. The main focus of this thesis is a regional examination of the trace element ratios of O. umbonatus and test their suitability in paleoceanographic applications. Trace elements were measured using LA-ICP-MS on core top samples collected along a transect off Namibia and Mg/Ca ratios where than calibrated against BWTs. The influence of the carbonate ion concentration of sea water and pore-water on trace element and stable isotope incorporation in tests has been discussed and the implications on O. umbonatus was analyzed. These findings were used to investigate the changes in the water mass stratification between the Holocene and the LGM. The sea water density of our samples reveals that our samples follow the regular water mass sequence. BWTs show nearly no changes between the LGM and the Holocene.
Keywords: laser ablation ICP-MS; benthic foraminifera; trace elements; stable isotopes; temperature; carbonate ion effect
Issue Date: 12-Dec-2008
Type: Dissertation
Secondary publication: no
URN: urn:nbn:de:gbv:46-diss000112883
Institution: Universität Bremen 
Faculty: Fachbereich 05: Geowissenschaften (FB 05) 
Appears in Collections:Dissertationen

  

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