Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6438483 | Geochimica et Cosmochimica Acta | 2014 | 21 Pages |
Abstract
No detectable effect of r and tA on αg-m was observed. However, SIMS data revealed a remarkable increase of αg-m from â¼0.9985 ± 0.0007 at >QFM+3 to â¼1.0042 ± 0.0042 at â¼QFM+1. Noteworthy, the isotopic fractionation at reducing conditions was about an order of magnitude larger than predicted by previous works. Based on our experimental results and on previous findings for S speciation in fluid and silicate melt a new model predicting the effect of fO2 on αg-m (or Î34Sg-m) in andesitic systems at 1030 °C is proposed. Our experimental results as well as our modeling are of high importance for the interpretation of S isotope signatures in natural samples (e.g., melt inclusions or volcanic gases).
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Geochemistry and Petrology
Authors
Adrian Fiege, François Holtz, Nobumichi Shimizu, Charles W. Mandeville, Harald Behrens, Jaayke L. Knipping,