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Citation link: http://nbn-resolving.de/urn:nbn:de:gbv:46-diss000119834
00011983.pdf
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Biogeochemical processes in sediments associated to cold-water coral ecosystems: From living reefs to ancient mounds


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Other Titles: Biogeochemische Prozesse in Sedimenten assoziiert mit Kaltwasserkorallenriffen
Authors: Wehrmann, Laura Mariana 
Supervisor: Jorgensen, Bo Barker
1. Expert: Jorgensen, Bo Barker
Experts: Zabel, Matthias
Abstract: 
Syn- to post-depositional microbially-mediated diagenetic processes in cold-water coral reef associated sediments are addressed here to assess the coupling between sulfur and iron cycles, and carbonate formation and dissolution. Organic carbon mineralization at cold-water coral reefs on the Norwegian margin occurred in: a) the reef surface framework consisting of living and dead coral thickets and b) the underlying sediments. Several cold-water coral mounds in the Gulf of Cadiz were influenced by ascending hydrocarbon-rich fluids and the diagenetic imprint of a sulfate-methane transition zone (SMTZ) was evidenced. Carbonate preservation in the cold-water coral reef associated sediments was controlled by the availability of reactive iron. The interplay of low rates of sulfate reduction and the input of terrigenous Fe-rich material led to a buffering of the pore-water carbonate system in the Norwegian reef sediments. Conversely, processes that led to a scavenging of Fe-oxides such as the production of hydrogen sulfide facilitated carbonate dissolution. This was manifested in distinct layers of dissolved corals in Gulf of Cadiz mound sediments.
Keywords: cold-water coral reefs; coral mounds; early diagenesis; marine biogeochemistry
Issue Date: 5-Mar-2010
Type: Dissertation
Secondary publication: no
URN: urn:nbn:de:gbv:46-diss000119834
Institution: Universität Bremen 
Faculty: Fachbereich 05: Geowissenschaften (FB 05) 
Appears in Collections:Dissertationen

  

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