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(2020) Dating Biosignatures in Fracture Habitats of the Deep Igneous Rock-Hosted Biosphere

Tillberg M, Drake H, Roberts N, Zack T, Ivarsson M, Heim C & Whitehouse M


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09e: Room 3, Friday 26th June 01:21 - 01:24

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Submitted by Oliver Warr on Thursday 25th June 23:32
Hi, I enjoyed listening to your talk. I was wondering what direct biogeochemical or isotopic evidence you might have for these fluids to support your theory of vertical fluid migration which brings in nutrient rich waters episodically and the proposed progressive seepage of shale hydrocarbons?
Hi Oliver, thanks for your question, it is indeed critical to trace the source of the hydrocarbons and fluids in order to characterize the system, this is something our group has worked extensively on, as presented in e.g. Drake et al., 2015 (NatComm), Drake et al., 2017 (EPSL), Drake et al., 2018 (Geobiology). In short, the evidence of hydrocarbon descending from organic-rich rocks overlying the crystalline basement, but also from mocrobially mediated methanogenesis, is based on biomarker analysis of the microbial remnants, in combination with extreme values and ranges of deltaC and -S isotopes.

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