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      Timing and tempo of the Great Oxidation Event

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          The least-squares line and plane and the analysis of palaeomagnetic data

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            Atmospheric influence of Earth's earliest sulfur cycle

            Mass-independent isotopic signatures for delta(33)S, delta(34)S, and delta(36)S from sulfide and sulfate in Precambrian rocks indicate that a change occurred in the sulfur cycle between 2090 and 2450 million years ago (Ma). Before 2450 Ma, the cycle was influenced by gas-phase atmospheric reactions. These atmospheric reactions also played a role in determining the oxidation state of sulfur, implying that atmospheric oxygen partial pressures were low and that the roles of oxidative weathering and of microbial oxidation and reduction of sulfur were minimal. Atmospheric fractionation processes should be considered in the use of sulfur isotopes to study the onset and consequences of microbial fractionation processes in Earth's early history.
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              Assembly, configuration, and break-up history of Rodinia: A synthesis

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                Author and article information

                Journal
                Proceedings of the National Academy of Sciences
                Proc Natl Acad Sci USA
                Proceedings of the National Academy of Sciences
                0027-8424
                1091-6490
                February 21 2017
                February 21 2017
                : 114
                : 8
                : 1811-1816
                Article
                10.1073/pnas.1608824114
                5338422
                28167763
                0c22e407-9f67-4f06-bbbb-4b330fba2f49
                © 2017
                History

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