Fig. 8: Isotopic composition of archaeal lipids in serpentinization ecosystems, carbon species and substrates.
From: Biomarker evidence of a serpentinite chemosynthetic biosphere at the Mariana forearc
a Compound-specific δ¹³C isotopic composition of archaeal lipids at Chimaera seeps and Lost City hydrothermal vent field (grey shaded box). b Compound-specific δ¹³C isotopic composition of ANME-derived lipids at Pacman mud volcano (yellow shaded box), expected compound-specific δ¹³C isotopic range of methanogen-derived lipids for various methanogenic pathways based on the known isotopic substrate-to-lipid fractionation and known substrate δ¹³C composition at Mariana forearc (purple shaded boxes). Compound-specific δ¹³C isotopic composition of archaeal diethers detected in core GeoB24930-1 at Subetbia mud volcano (yellow shaded box). All δ13C values are reported in ‰ relative to the V-PDB standard. ANME anaerobic methanotrophic archaea, AR archaeol, cmbsf cm below seafloor, DIC dissolved inorganic carbon, OH-AR hydroxyarchaeol, TOC total organic carbon, V-PDB Vienna-Pee Dee Belemnite.
