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DOI	10.1016/j.epsl.2020.116165
	The multiple sulphur isotope fingerprint of a sub-seafloor oxidative sulphur cycle driven by iron
	Liu J.; Pellerin A.; Izon G.; Wang J.; Antler G.; Liang J.; Su P.; Jørgensen B.B.; Ono S.
发表日期	2020
ISSN	0012821X
卷号	536
英文摘要	Oxidative sulphur cycling is pervasive in marine sediments, replenishing the oxidised sulphur reservoir via re-oxidation of sulphide. An active, yet cryptic, sulphur cycle has been proposed to operate at depth beneath the sulphate-methane transition (SMT), fuelled by simultaneous sulphide oxidation and sulphate reduction under low-sulphate conditions. The existence of a cryptic sulphur cycle, however, is centred on porewater and genetic data that have little, to no, preservation potential, and thus are rarely accessible from the geological record. The absence of a suitable archive has hindered our ability to reconstruct the operation and importance of the cryptic sulphur cycle through space and time. To overcome this obstacle, and to develop a better understanding of the oxidative sulphur cycle in the deep biosphere, we have determined the abundance and triple sulphur isotope composition (Δ33S and δ34S) of both elemental sulphur and pyrite extracted from sediments recovered from the methane prone Taixinan Basin, South China Sea. Here, multiple sulphur isotope systematics of pyrite clearly reveal a tiering, with organoclastic sulphate reduction succumbing to sulphate-driven anaerobic oxidation of methane at depth. Importantly, a negative Δ33S-δ34S correlation was found at the periphery of the SMT that requires repeated and sustained iron-driven sulphide oxidation with concomitant disproportionation of the elemental sulphur product. We conclude that minor sulphur isotopes may provide a unique lens to resolve the cryptic sulphur cycle, allowing the importance of the deep biosphere to be evaluated over geological timescales. In turn, a better understanding of the cryptic sulphur cycle remains central to testing hypotheses linking major elemental cycles and diverse microbial activities that persist under the energy-limited conditions that typify the deep biosphere. © 2020 Elsevier B.V.
关键词	cryptic sulphur cycle deep biosphere sedimentary pyrite South China Sea sulphur disproportionation triple sulphur isotopes
英文关键词	Biospherics; Isotopes; Methane; Oxidation; Pyrites; Submarine geology; Sulfur compounds; cryptic sulphur cycle; deep biosphere; Disproportionations; South China sea; Sulphur isotope; Sulfur; biosphere; iron; marine sediment; oxidation; pyrite; seafloor; sulfur cycle; sulfur isotope; Pacific Ocean; South China Sea; Taixinan Basin
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202747
作者单位	State Key Laboratory of Biogeology and Environment Geology, College of Marine Science and Technology, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Center for Geomicrobiology, Department of Bioscience, Aarhus University, Aarhus C, 8000, Denmark; Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, Beersheba, 84105, Israel; The Interuniversity Institute for Marine Sciences, Eilat, 88103, Israel; Guangzhou Marine Geological Survey, Guangzhou, 510760, China
推荐引用方式 GB/T 7714	Liu J.,Pellerin A.,Izon G.,et al. The multiple sulphur isotope fingerprint of a sub-seafloor oxidative sulphur cycle driven by iron[J],2020,536.
APA	Liu J..,Pellerin A..,Izon G..,Wang J..,Antler G..,...&Ono S..(2020).The multiple sulphur isotope fingerprint of a sub-seafloor oxidative sulphur cycle driven by iron.Earth and Planetary Science Letters,536.
MLA	Liu J.,et al."The multiple sulphur isotope fingerprint of a sub-seafloor oxidative sulphur cycle driven by iron".Earth and Planetary Science Letters 536(2020).