DOI: 10.1016/j.epsl.2020.116165
论文题名: The multiple sulphur isotope fingerprint of a sub-seafloor oxidative sulphur cycle driven by iron
作者: Liu J. ; Pellerin A. ; Izon G. ; Wang J. ; Antler G. ; Liang J. ; Su P. ; Jørgensen B.B. ; Ono S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 536 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165125
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
Liu J.,Pellerin A.,Izon G.,et al. The multiple sulphur isotope fingerprint of a sub-seafloor oxidative sulphur cycle driven by iron[J]. Earth and Planetary Science Letters,2020-01-01,536