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- W2013805224 abstract "Seven sulfur-isotope stages are apparent in Australian Neoproterozoic sections. (1) From 840 Ma to the Sturtian glaciation (700 Ma) δ34Ssulfate varied little (+19 to +17.5‰) and δ34Ssulfide ranged from −20 to +23‰. (2) The Sturtian glaciation was followed by (3) a rise in δ34Ssulfide to an average of +30‰ (seen also in China, Namibia and Canada) and in δ34Ssulfate at least to +26‰ and possibly to +45‰. The sharp rise in δ34S of all sulfur fractions (sulfate, sulfide, and organic) leads us to speculate that sulfide depleted in 34S was deposited on the abyssal plain and that residual sulfate enriched in 34S remained beneath a stagnant, ice-covered ocean during the Sturtian glaciation and was brought to the shallow continental margin during the post-glacial transgression. (4) δ34Ssulfide and δ34Ssulfate fall from 640 to 607 Ma (δ34Ssulfate down to +17‰) probably from oxygen excess (through massive organic carbon burial), which causes weathering of sulfide depleted in 34S continental sulfide and previously deposited sulfide on the abyssal plain. (5) The oxic environment of the Marinoan (605–595 Ma) glaciation minimises sulfate-reduction (unlike the Sturtian) so that δ34Ssulfate is unvarying. (6) The post-glacial environment has sulfide depleted in 34S (average δ34Ssulfide<−30‰). Burial of a substantial quantity of organic-carbon causes extensive bacterial reduction of sulfate and a rise in δ34Ssulfate to a peak of at least +32‰ (7) around the Neoproterozoic–Cambrian boundary and a corresponding rise in δ34Ssulfide, explained by release of methane gas from clathrate and a subsequent heatwave causing ocean stagnation and oxygen depletion." @default.
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- W2013805224 date "2000-03-01" @default.
- W2013805224 modified "2023-10-18" @default.
- W2013805224 title "Neoproterozoic sulfur-isotope variation in Australia and global implications" @default.
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- W2013805224 doi "https://doi.org/10.1016/s0301-9268(99)00073-x" @default.
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