DOI: 10.1111/gbi.12163
Scopus记录号: 2-s2.0-85027952050
论文题名: Carbon and sulfur isotopic signatures of ancient life and environment at the microbial scale: Neoarchean shales and carbonates
作者: Williford K.H. ; Ushikubo T. ; Lepot K. ; Kitajima K. ; Hallmann C. ; Spicuzza M.J. ; Kozdon R. ; Eigenbrode J.L. ; Summons R.E. ; Valley J.W.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期: 2 起始页码: 105
结束页码: 128
语种: 英语
Scopus关键词: carbon
; carbonic acid derivative
; iron
; organic compound
; pyrite
; sulfide
; sulfur
; Archean
; carbon isotope
; carbonate
; fractionation
; geological record
; isotopic composition
; kerogen
; methane
; methanotrophy
; organic matter
; photoautotrophy
; pyrite
; shale
; spatial resolution
; sulfur isotope
; chemistry
; microbiology
; sediment
; Carbon Isotopes
; Carbonates
; Environmental Microbiology
; Geologic Sediments
; Iron
; Organic Chemicals
; Sulfides
; Sulfur Isotopes
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: An approach to coordinated, spatially resolved, in situ carbon isotope analysis of organic matter and carbonate minerals, and sulfur three- and four-isotope analysis of pyrite with an unprecedented combination of spatial resolution, precision, and accuracy is described. Organic matter and pyrite from eleven rock samples of Neoarchean drill core express nearly the entire range of δ(13) C, δ(34) S, Δ(33) S, and Δ(36) S known from the geologic record, commonly in correlation with morphology, mineralogy, and elemental composition. A new analytical approach (including a set of organic calibration standards) to account for a strong correlation between H/C and instrumental bias in SIMS δ(13) C measurement of organic matter is identified. Small (2-3 μm) organic domains in carbonate matrices are analyzed with sub-permil accuracy and precision. Separate 20- to 50-μm domains of kerogen in a single ~0.5 cm(3) sample of the ~2.7 Ga Tumbiana Formation have δ(13) C = -52.3 ± 0.1‰ and -34.4 ± 0.1‰, likely preserving distinct signatures of methanotrophy and photoautotrophy. Pyrobitumen in the ~2.6 Ga Jeerinah Formation and the ~2.5 Ga Mount McRae Shale is systematically (13) C-enriched relative to co-occurring kerogen, and associations with uraniferous mineral grains suggest radiolytic alteration. A large range in sulfur isotopic compositions (including higher Δ(33) S and more extreme spatial gradients in Δ(33) S and Δ(36) S than any previously reported) are observed in correlation with morphology and associated mineralogy. Changing systematics of δ(34) S, Δ(33) S, and Δ(36) S, previously investigated at the millimeter to centimeter scale using bulk analysis, are shown to occur at the micrometer scale of individual pyrite grains. These results support the emerging view that the dampened signature of mass-independent sulfur isotope fractionation (S-MIF) associated with the Mesoarchean continued into the early Neoarchean, and that the connections between methane and sulfur metabolism affected the production and preservation of S-MIF during the first half of the planet's history. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85116
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Geoscience, University of Wisconsin, Madison, WI, USA; NASA Astrobiology Institute, University of Wisconsin, Madison, WI, USA; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA; Earth, Atmospheric and Planetary Science Department, Massachusetts Institute of Technology, Cambridge, MA, USA; Planetary Environments Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA
Recommended Citation:
Williford K.H.,Ushikubo T.,Lepot K.,et al. Carbon and sulfur isotopic signatures of ancient life and environment at the microbial scale: Neoarchean shales and carbonates[J]. Geobiology,2016-01-01,14(2)