globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12234
Scopus记录号: 2-s2.0-85015196129
论文题名:
The Neoarchaean surficial sulphur cycle: An alternative hypothesis based on analogies with 20th-century atmospheric lead
作者: Gallagher M.; Whitehouse M.J.; Kamber B.S.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期:3
起始页码: 385
结束页码: 400
语种: 英语
Scopus关键词: Archean ; atmospheric chemistry ; lead ; pyrite ; seawater ; sulfur cycle ; sulfur isotope ; Australia ; calcium carbonate ; iron ; pyrite ; sulfide ; sulfur ; chemistry ; geographic and geological phenomena ; sediment ; South Africa ; Calcium Carbonate ; Geologic Sediments ; Geological Phenomena ; Iron ; South Africa ; 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: We revisit the S-isotope systematics of sedimentary pyrite in a shaly limestone from the ca. 2.52 Ga Gamohaan Formation, Upper Campbellrand Subgroup, Transvaal, South Africa. The analysed rock is interpreted to have been deposited in a water depth of ca. 50–100 m, in a restricted sub-basin on a drowning platform. A previous study discovered that the pyrites define a nonzero intercept δ34SV - CDT–Δ33S data array. The present study carried out further quadruple S-isotope analyses of pyrite, confirming and expanding the linear δ34SV - CDT–Δ33S array with an δ34S zero intercept at ∆33S ca. +5. This was previously interpreted to indicate mixing of unrelated S-sources in the sediment environment, involving a combination of recycled sulphur from sulphides that had originally formed by sulphate-reducing bacteria, along with elemental sulphur. Here, we advance an alternative explanation based on the recognition that the Archaean seawater sulphate concentration was likely very low, implying that the Archaean ocean could have been poorly mixed with respect to sulphur. Thus, modern oceanic sulphur systematics provide limited insight into the Archaean sulphur cycle. Instead, we propose that the 20th-century atmospheric lead event may be a useful analogue. Similar to industrial lead, the main oceanic input of Archaean sulphur was through atmospheric raindown, with individual giant point sources capable of temporally dominating atmospheric input. Local atmospheric S-isotope signals, of no global significance, could thus have been transmitted into the localised sediment record. Thus, the nonzero intercept δ34SV - CDT–Δ33S data array may alternatively represent a very localised S-isotope signature in the Neoarchaean surface environment. Fallout from local volcanic eruptions could imprint recycled MIF-S signals into pyrite of restricted depositional environments, thereby avoiding attenuation of the signal in the subdued, averaged global open ocean sulphur pool. Thus, the superposition of extreme local S-isotope signals offers an alternative explanation for the large Neoarchaean MIF-S excursions and asymmetry of the Δ33S rock record. © 2017 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85061
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作者单位: Department of Geology, School of Natural Sciences, Trinity College Dublin, Dublin, Ireland; Department of Geosciences, Swedish Museum of Natural History, Stockholm, Sweden

Recommended Citation:
Gallagher M.,Whitehouse M.J.,Kamber B.S.. The Neoarchaean surficial sulphur cycle: An alternative hypothesis based on analogies with 20th-century atmospheric lead[J]. Geobiology,2017-01-01,15(3)
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