Isotopic evidence of acetate turnover in Precambrian continental fracture fluids

Elliott P. Mueller (), Juliann Panehal, Alexander Meshoulam, Min Song, Christian T. Hansen, Oliver Warr, Jason Boettger, Verena B. Heuer, Wolfgang Bach, Kai-Uwe Hinrichs, John M. Eiler, Victoria Orphan, Barbara Sherwood Lollar and Alex L. Sessions
Additional contact information
Elliott P. Mueller: California Institute of Technology
Juliann Panehal: California Institute of Technology
Alexander Meshoulam: California Institute of Technology
Min Song: University of Toronto
Christian T. Hansen: University of Bremen
Oliver Warr: University of Toronto
Jason Boettger: University of Texas at El Paso
Verena B. Heuer: University of Bremen
Wolfgang Bach: University of Bremen
Kai-Uwe Hinrichs: University of Bremen
John M. Eiler: California Institute of Technology
Victoria Orphan: California Institute of Technology
Barbara Sherwood Lollar: University of Toronto
Alex L. Sessions: California Institute of Technology

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract The deep continental crust represents a vast potential habitat for microbial life where its activity remains poorly constrained. Organic acids like acetate are common in these ecosystems, but their role in the subsurface carbon cycle - including the mechanism and rate of their turnover - is still unclear. Here, we develop an isotope-exchange ‘clock’ based on the abiotic equilibration of H-isotopes between acetate and water, which can be used to define the maximum in situ acetate residence time. We apply this technique to the fracture fluids in Birchtree and Kidd Creek mines within the Canadian Precambrian crust. At both sites, we find that acetate residence times are

Date: 2024
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DOI: 10.1038/s41467-024-53438-4

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