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Li, Ji-Lei; Schwarzenbach, Esther M; John, Timm; Ague, Jay J; Huang, Fang; Gao, Jun; Klemd, Reiner; Whitehouse, Martin J; Wang, Xin-Shui
Nature communications, 01/2020, Letnik: 11, Številka: 1Journal Article
Sulfur belongs among H O, CO , and Cl as one of the key volatiles in Earth's chemical cycles. High oxygen fugacity, sulfur concentration, and δ S values in volcanic arc rocks have been attributed to significant sulfate addition by slab fluids. However, sulfur speciation, flux, and isotope composition in slab-dehydrated fluids remain unclear. Here, we use high-pressure rocks and enclosed veins to provide direct constraints on subduction zone sulfur recycling for a typical oceanic lithosphere. Textural and thermodynamic evidence indicates the predominance of reduced sulfur species in slab fluids; those derived from metasediments, altered oceanic crust, and serpentinite have δ S values of approximately -8‰, -1‰, and +8‰, respectively. Mass-balance calculations demonstrate that 6.4% (up to 20% maximum) of total subducted sulfur is released between 30-230 km depth, and the predominant sulfur loss takes place at 70-100 km with a net δ S composition of -2.5 ± 3‰. We conclude that modest slab-to-wedge sulfur transport occurs, but that slab-derived fluids provide negligible sulfate to oxidize the sub-arc mantle and cannot deliver S-enriched sulfur to produce the positive δ S signature in arc settings. Most sulfur has negative δ S and is subducted into the deep mantle, which could cause a long-term increase in the δ S of Earth surface reservoirs.
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