Predominance of archaea-derived hydrocarbons in an Early Triassic microbialite

Ryosuke Saito, Kunio Kaiho, Masahiro Oba, Megumu Fujibayashi, Jinnan Tong, Li Tian

研究成果: Article査読

13 被引用数 (Scopus)

抄録

We investigated the distribution of lipids in Lower Triassic sedimentary rocks (252-247myr) from South China, including a shallow water microbialite in the uppermost section of the outcrop. Archaeal derived hydrocarbons were the major constituents of the microbialite from the latest Early Triassic. Among these, we detected (i) abundant C40 acyclic and monocyclic biphytanes (possibly derived from glycerol dialkyl glycerol tetraether lipids) and their degradation products, C30-39 pseudohomologues and (ii) a C25 head-to-tail linked (regular) isoprenoid hydrocarbon [possibly derived from dialkyl glycerol diether lipids (DGDs)] and its degradation products, C21-24 pseudohomologues and abundant pristane and phytane. Through combination of compound-specific stable carbon isotope analysis of isoprenoid hydrocarbons, which had average δ13C values of -35‰ to -30‰, and their molecular distribution, it was not possible to unambiguously define the archaeal source for the biphytanes in the microbialite. The δ13C values for pristane and phytane were similar to those for head-to-tail linked C21-25 isoprenoids; potential source organisms for these compounds were halophilic archaea. Except for methane seep microbialites, no other ancient or recent phototrophic microbialites have been reported to contain predominantly archaeal isoprenoid hydrocarbons. Our findings suggest the presence of a new type of microbialite.

本文言語English
ページ(範囲)66-75
ページ数10
ジャーナルOrganic Geochemistry
85
DOI
出版ステータスPublished - 2015 8 1

ASJC Scopus subject areas

  • 地球化学および岩石学

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