气候变化领域集成服务门户(CCPortal): Discovery of the oldest known biomarkers provides evidence for phototrophic bacteria in the 1.73 Ga Wollogorang Formation, Australia

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DOI	10.1111/gbi.12390
	Discovery of the oldest known biomarkers provides evidence for phototrophic bacteria in the 1.73 Ga Wollogorang Formation, Australia
	Vinnichenko G.; Jarrett A.J.M.; Hope J.M.; Brocks J.J.
发表日期	2020
ISSN	14724677
英文摘要	The discovery of mid-Proterozoic (1.8–0.8 billion years ago, Ga) indigenous biomarkers is a challenge, since biologically informative molecules of such antiquity are commonly destroyed by metamorphism or overprinted by drilling fluids and other anthropogenic petroleum products. Previously, the oldest clearly indigenous biomarkers were reported from the 1.64 Ga Barney Creek Formation in the northern Australian McArthur Basin. In this study, we present the discovery of biomarker molecules from carbonaceous shales of the 1.73 Ga Wollogorang Formation in the southern McArthur Basin, extending the biomarker record back in time by ~90 million years. The extracted hydrocarbons illustrate typical mid-Proterozoic signatures with a large unresolved complex mixture, high methyl alkane/n-alkane ratios and the absence of eukaryotic steranes. Acyclic isoprenoids, saturated carotenoid derivatives, bacterial hopanes and aromatic hopanoids and steroids also were below detection limits. However, continuous homologous series of low molecular weight C14–C19 2,3,4- and 2,3,6-trimethyl aryl isoprenoids (AI) were identified, and C20–C22 AI homologues were tentatively identified. Based on elevated abundances relative to abiogenic isomers, we interpret the 2,3,6-AI isomer series as biogenic molecules and the 2,3,4-AI series as possibly biogenic. The biological sources for the 2,3,6-AI series include carotenoids of cyanobacteria and/or green sulphur bacteria (Chlorobiaceae). The lower concentrated 2,3,4-AI series may be derived from purple sulphur bacteria (Chromatiaceae). These degradation products of carotenoids are the oldest known clearly indigenous molecules of likely biogenic origin. © 2020 John Wiley & Sons Ltd
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133206
推荐引用方式 GB/T 7714	Vinnichenko G.,Jarrett A.J.M.,Hope J.M.,et al. Discovery of the oldest known biomarkers provides evidence for phototrophic bacteria in the 1.73 Ga Wollogorang Formation, Australia[J]. Geobiology,2020.
APA	Vinnichenko G.,Jarrett A.J.M.,Hope J.M.,&Brocks J.J..(2020).Discovery of the oldest known biomarkers provides evidence for phototrophic bacteria in the 1.73 Ga Wollogorang Formation, Australia..
MLA	Vinnichenko G.,et al."Discovery of the oldest known biomarkers provides evidence for phototrophic bacteria in the 1.73 Ga Wollogorang Formation, Australia".(2020).