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- 2Pyrite nodules
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A Multidisciplinary Investigation on the Influence of Archean Seawater Composition and UV radiation levels on the Survival and Evolution of Early Microorganisms
DownloadFall 2014
Life evolved in the oceans nearly four billion years ago, but the environmental conditions surrounding its evolution remains poorly understood. While Archean seawater (2.5 to 3.8 Ga) provided ancient microorganisms with the bioactive trace metals needed to sustain their metabolic requirements, it...
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Identify Metamorphic and Primary Multiple Sulfur Isotopic Signatures in the 2.7 Ga Pyrite Nodules from the Southwestern Superior Province (Minnesota, USA)
DownloadSpring 2016
Sulfur isotopes of some Archean rocks show unique mass independent fractionation (S-MIF) signatures, which are generally considered to have been produced by UV radiolysis on volcanic SO2 in the oxygen-free Archean atmosphere. Based on the distinct S-MIF signals of different sulfur sources (i.e.,...
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Volcanic Influence on Atmospheric Sulfur Cycle in 2.7 Ga inferred from Multiple Sulfur Isotope Record of Pyrite Nodules in Black Shales from Nimbus, Western Australia
DownloadSpring 2018
Sulfur isotope compositions of Archean sulfide and sulfate minerals show mass-independent fractionation (S-MIF) signatures, which are characterized by non-zero Î33S and Î36S values. Producing the Archean S-MIF signal requires an O2-free atmosphere where broad-band UV radiation can penetrate to...