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Serpentinization, the water-rock reaction forming serpentine mineral assemblages from olivine and pyroxene-bearing protoliths, can co-occur with the production of hydrogen, methane, and diverse organic compounds. Serpentinization is regarded as a geologic process important to the sustainability of the deep biosphere and the origin of life. Serpentinization has been found to support metabolisms involving anaerobic COoxidation, acetogenesis, reduction of sulfur compounds, H2 oxidation, CO2 fixation, magnetite reduction, and fermentation. There is on-going research to develop a method that can visually depict mineral associations in serpentinites with serpentinization-related organics. In this report, we describe new findings, using μFTIR to map minerals and associated organics related to serpentinization. To do this, we identified, confirmed, and documented FTIR wavenumber regions linked to (I) serpentinization-associated minerals and embedded organics, (II) carbonate-associated minerals, and (III) a polysaccharide proxy for EPS. The findings of this study indicate that organic presence with a mineral background can be detected using reflection mode-μFTIR (R-FTIR) and transmission mode-μFTIR (T-FTIR). Implications of this study include increased prospects for use of FTIR in interrogating polished rock surfaces to determine the association of organics to mineral phases and boundaries in serpentinization-related lithologies.

Mineral Identification and Preliminary Mapping of Organic Compounds in Serpentinite-Related Lithologies Using μFTIR