Photosynthetic isotope biosignatures in laminated micro-stromatolitic and non-laminated nodules associated with modern, freshwater microbialites in Pavilion Lake, B.C.

The influence of microbial activity on carbonate precipitation was investigated within micro-stromatolitic nodules associated with modern, freshwater microbialites located in Pavilion Lake, B.C. Observed carbonate δ13C values enriched by up to +3.6‰ as compared to predicted abiotic carbonate δ13C values from measured dissolved inorganic carbon (mean −1.2‰, n=13) were consistent with microbial photosynthetic influence on in situ precipitation …