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| Sansjofre, Pierre; Cartigny, Pierre; Trindade, Ricardo I. F.; Nogueira, Afonso C. R.; Agrinier, Pierre; Ader, Magali. |
| The terminal Neoproterozoic Era (850-542 Ma) is characterized by the most pronounced positive sulfur isotope (S-34/S-32) excursions in Earth's history, with strong variability and maximum values averaging delta S-34 similar to+38 parts per thousand. These excursions have been mostly interpreted in the framework of steady-state models, in which ocean sulfate concentrations do not fluctuate (that is, sulfate input equals sulfate output). Such models imply a large pyrite burial increase together with a dramatic fluctuation in the isotope composition of marine sulfate inputs, and/or a change in microbial sulfur metabolisms. Here, using multiple sulfur isotopes (S-33/S-32, S-34/S-32 and S-36/S-32 ratios) of carbonate-associated sulfate, we demonstrate that the... |
| Tipo: Text |
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| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00639/75075/75603.pdf |
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