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Department Seminar Speaker - 02/19/2019 - Sasha Turchyn, University of Cambridge

"The microbially-driven formation of sedimentary carbonate minerals"
Authigenic carbonate refers to carbonate minerals that form, often in sedimentary environments, from respired organic matter, and it has been suggested that at times in Earth history authigenic carbonate may form a significant sink for carbon from the global carbon cycle. The driver for this authigenic carbonate formation is anoxic microbial populations who locally change the pH and carbonate saturation state, allowing carbonate minerals to form. I will discuss the global drivers of authigenic carbonate formation, using the ODP/IODP database, and specifically the role that microbial populations, particularly sulfate reducing bacteria, play in sedimentary carbonate precipitation. Results from the pure culture growth of sulfate reducing bacteria suggest a role of sediment mineralogy in the overall activity of the deep biosphere.

Location: Guyot Hall - Room 10

Date/Time: 02/19/19 at 12:30 pm - 02/19/19 at 1:20 pm

Category: Seminar

Department: Geosciences