Room Number: 2B385
- Authigenic minerals
- Sediment geochemistry
- Onshore serpentinization
The geobiology of an onshore serpentinite-hosted ecosystem
Serpentinites are rocks mainly composed of serpentine group minerals, which are produced by hydrothermal alteration of olivine-rich, ultra-mafic rocks exposed primarily on mid oceanic ridges. Seafloor serpentinite-hosted hydrothermal systems are unique habitats due to the fact that hydrogen and methane produced by serpentinization reactions can be utilized by microorganisms to gain metabolic energy. The abundance of chemical energy makes serpentinites a strong candidate site for the origin of life on Earth, as well as a prime target in the search for extraterrestrial life. Serpentinization reactions produce carbonate minerals, sequestering carbon dioxide. These so-called carbonation reactions occur where peridotites are altered in the subseafloor as well as on land. Despite considerable effort, the processes governing methane formation and carbonate precipitation associated with serpentinization are still not sufficiently understood. The role of microbial methanogenesis and possibly methanotrophy in the cycling of carbon and mineral authigenesis is even less well constrained. My study investigates serpentinization and serpentinite-hosted carbonates. The goals of my project are to characterize the chemosynthesis-based microbial communities, to assess their role in carbonate precipitation, and to constrain the relative contribution of microbial methanogenesis to methane production.
Zwicker, J., Smrzka, D., Gier, S., Goedert, J.L., Peckmann, J., 2015. Mineralized conduits are part of the uppermost plumbing system of Oligocene methane-seep deposits, Washington State (USA). Marine and Petroleum Geology, in press.
Smrzka, D., Krämer, S.M., Zwicker, J., Birgel, D., Fischer, D., Kasten, S., Goedert, J.L., Peckmann, J., 2015. Constraining silica diagenesis in methane-seep deposits. Palaeogeography, Palaeoclimatology, Palaeoecology 420, 13−26.
Zwicker, J., Smrzka, D., 2014. ECORD Bremen Summer School Reports: “Subseafloor Biosphere: Current Advances and Future Challenges”, 22nd September – 2nd October 2014, Bremen, Germany. In: European Consortium of Ocean Research Drilling (ECORD) Newsletter #23, November 2014.