Journal ArticleDOI
Chemical cycles in the evolution of the earth
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This article is published in Earth-Science Reviews.The article was published on 1992-04-01. It has received 22 citations till now. The article focuses on the topics: Earth (chemistry).read more
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The habitat and nature of early life
Euan G. Nisbet,Norman H. Sleep +1 more
TL;DR: It is possible that early life diversified near hydrothermal vents, but hypotheses that life first occupied other pre-bottleneck habitats are tenable (including transfer from Mars on ejecta from impacts there).
Journal ArticleDOI
Calibration of Sulfate Levels in the Archean Ocean
TL;DR: Sulfur isotope fractionation experiments on marine and freshwater sulfate reducers, together with the isotope record, imply that oceanic Archean sulfate concentrations were less than one-hundredth of present marine sulfate levels and one-fifth of what was previously thought.
Journal ArticleDOI
Enigmatic origin of the largest-known carbon isotope excursion in Earth's history
TL;DR: The Shuram excursion as mentioned in this paper is the largest excursion in carbon isotope compositions in Earth history, and it was found to be caused by post-depositional alteration that is global rather than local.
Journal ArticleDOI
Interannual variability in the North Atlantic ocean carbon sink
TL;DR: It is deduced that the carbon variability at this site is largely driven by variations in winter mixed-layer depths and by sea surface temperature anomalies, and this extrapolation is supported by basin-wide estimates from atmospheric carbon dioxide inversions.
Journal ArticleDOI
Active Microbial Sulfur Disproportionation in the Mesoproterozoic
David T. Johnston,Boswell A. Wing,James Farquhar,Alan J. Kaufman,Harald Strauss,Timothy W. Lyons,Linda C. Kah,Donald E. Canfield +7 more
TL;DR: A Proterozoic seawater sulfate isotope record that includes the less abundant sulfur isotope 33S implies that sulfur compound disproportionation was an active part of the sulfur cycle by 1300 Ma and that progressive Earth surface oxygenation may have characterized the Mesoproterozoics.