期刊
GEOLOGY
卷 47, 期 4, 页码 375-379出版社
GEOLOGICAL SOC AMER, INC
DOI: 10.1130/G45464.1
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资金
- Geological Survey of Canada's Geomapping for Energy and Minerals (GEM) program
- Natural Science and Engineering Research Council of Canada (NSERC) Discovery Grant
We utilized a novel approach to modeling the oceanic sulfur cycle by combining delta S-34 and Delta S-33 curves from sulfate evaporite minerals in order to investigate redox conditions during the mid-Neoproterozoic. This technique allowed us to estimate the oxidized and reduced proportions of the total oceanic sulfur sink. Isotopic data from the mid-Neoproterozoic Minto Inlet Formation (Victoria Island, Northwest Territories, Canada; ca.850 Ma) show a limited range (16.8 parts per thousand +/- 1.4 parts per thousand) in delta S-34 of seawater sulfate and a sulfur cycle that is strongly shifted toward the sulfate sink (pyrite burial fraction, f(p), = 0.2), suggesting oxidizing conditions in the ocean and atmosphere at the time of deposition. These evaporites and others, which were deposited contemporaneously within a huge intracontinental basin, acted as a chemical pump, removing sulfate from the oceans and oxygen from the atmosphere to be buried as sulfate evaporites.
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