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- Hinrichs Lab - C-Cascadia
Hinrichs Lab - C-Cascadia
C-Cascadia: Molecular-isotopic studies of subsurface carbon turnover in hydrate-bearing sediments at the Cascadia Margin (IODP Exp. 311)
| Duration: | July 2006 - June 2008 |
| Funding: | Deutsche Forschungsgemeinschaft (DFG) Schwerpunktprogramm 527 "Integrated Ocean Drilling Program/Ocean Drilling Program (IODP/ODP)" (Project HI 616/7-1) |
| Principal Investigator(s): | Kai-Uwe Hinrichs |
| Involved scientists in the Hinrichs Lab: | Verena Heuer |
| Partners: | Dr. T. Lorenson (U.S. Geological Survey, Coastal and Marine Geology Team, Menlo Park CA, USA), Dr. J.W. Pohlman (U.S. Geological Survey, Woods Hole Science Center, Woods Hole MA, USA), Prof. M.E. Torres (College of Oceanic and Atmospheric Sciences, Oregon State University, USA) |
Abstract
In this project we investigated biogeochemical processes associated with the production and accumulation of methane in gas hydrate-bearing marine sediments at the northern Cascadia Margin. Anomalously high concentrations of dissolved inorganic and organic carbon in the large majority of gas hydrate provinces, in particular in methanogenic zones, suggest that some poorly constrained mechanism(s) enhance turnover of organic carbon in hydrate-bearing subsurface environments relative to non-hydrate systems in otherwise similar depositional settings. The project goal was to gain a better understanding of the biologically mediated carbon transformations that contribute to accumulation of methane in geologic time spans in hydrate-bearing sedimentary systems.
The focus of our attention was the pool of dissolved organic carbon; in particular we studied the compound-specific isotopic compositions of acetate and other volatile fatty acids, complemented by compound specific isotope information of intact membrane lipids that represent live subsurface prokaryotes. Together, these techniques provide insights into mechanisms of carbon turnover and carbon metabolism of subsurface prokaryotes.
In this project we investigated biogeochemical processes associated with the production and accumulation of methane in gas hydrate-bearing marine sediments at the northern Cascadia Margin. Anomalously high concentrations of dissolved inorganic and organic carbon in the large majority of gas hydrate provinces, in particular in methanogenic zones, suggest that some poorly constrained mechanism(s) enhance turnover of organic carbon in hydrate-bearing subsurface environments relative to non-hydrate systems in otherwise similar depositional settings. The project goal was to gain a better understanding of the biologically mediated carbon transformations that contribute to accumulation of methane in geologic time spans in hydrate-bearing sedimentary systems.
The focus of our attention was the pool of dissolved organic carbon; in particular we studied the compound-specific isotopic compositions of acetate and other volatile fatty acids, complemented by compound specific isotope information of intact membrane lipids that represent live subsurface prokaryotes. Together, these techniques provide insights into mechanisms of carbon turnover and carbon metabolism of subsurface prokaryotes.