Articles | Volume 17, issue 7
Biogeosciences, 17, 2135–2148, 2020
https://doi.org/10.5194/bg-17-2135-2020
Biogeosciences, 17, 2135–2148, 2020
https://doi.org/10.5194/bg-17-2135-2020
Research article
17 Apr 2020
Research article | 17 Apr 2020

Predominance of hexamethylated 6-methyl branched glycerol dialkyl glycerol tetraethers in the Mariana Trench: source and environmental implication

Wenjie Xiao et al.

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Short summary
The hadal zone (6–11 km depth) is the least explored habitat on Earth. We studied microbial branched glycerol dialkyl glycerol tetraethers (brGDGTs) in the Challenger Deep, Mariana Trench. One unique feature is the strong predominance of 6-methyl brGDGT, which likely reflects an adaption of brGDGT-producing bacteria to alkaline seawater and low temperature. BrGDGTs, with elemental and isotopic data, suggest an autochthonous product for brGDGT. A new approach is proposed for brGDGT sourcing.
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