DOI: 10.1038/ngeo1647
论文题名: Neoarchaean seawater sulphate concentrations from sulphur isotopes in massive sulphide ore
作者: Jamieson J.W. ; Wing B.A. ; Farquhar J. ; Hannington M.D.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 1 起始页码: 61
结束页码: 64
语种: 英语
Scopus关键词: Archean
; chemical weathering
; concentration (composition)
; evaporation
; marine sediment
; open ocean
; ore deposit
; oxygen
; seawater
; sediment chemistry
; sulfate
; sulfur isotope
; Canada
; Kidd Creek
; Ontario [Canada]
英文摘要: The concentration of sulphate in today's oceans - approximately 28,000 μmol l -1 - is maintained by a balance between removal by pyrite burial and evaporite deposition and supply by oxidative weathering and the erosion of sulphate minerals from evaporites. Oceanic sulphate concentrations were much lower before the rise of atmospheric oxygen about 2.4 Gyr ago. The limited spread of δ 34 S values in sedimentary sulphides from 3.85 to 2.5 Gyr ago suggests that microbial sulphate reduction, if it played an important role in the Archaean marine sulphur cycle, must have occurred at sulphate concentrations of 200 μmol l -1 or less. Here we use sulphur isotope systematics of the 2.7 Gyr old volcanogenic massive sulphide ore deposits from Kidd Creek, Ontario, to provide constraints on seawater sulphate concentrations independent of biological considerations. By comparing these values with metal and sulphur budgets from modern hydrothermal settings, we estimate that seawater sulphate concentrations 2.7 Gyr ago were roughly 80 μmol l -1. At these levels, the residence time of sulphate was on the order of 200,000 years, sufficiently long to make sulphate a conservative compound in the open ocean, but still short enough to suggest that hydrothermal sulphur fluxes were accompanied by a globally significant sink associated with microbial sulphate reduction. © 2013 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106885
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Earth Sciences, University of Ottawa, ON, K1N 6N5, Canada; Department of Geology and Earth System Science Interdisciplinary Center (ESSIC), University of Maryland, College Park, MD 20742, United States; Department of Earth and Planetary Sciences and GEOTOP, McGill University, Montreal, QC, H3A 2A7, Canada
Recommended Citation:
Jamieson J.W.,Wing B.A.,Farquhar J.,et al. Neoarchaean seawater sulphate concentrations from sulphur isotopes in massive sulphide ore[J]. Nature Geoscience,2013-01-01,6(1)