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Mobilization of isotopically heavy sulfur during serpentinite subduction

Urheber*innen

Schwarzenbach,  Esther M.
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Dragovic,  Besim
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Codillo,  Emmanuel A.
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Streicher,  Linus
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

/persons/resource/mariro

Scicchitano,  Maria Rosa
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Wiechert,  Uwe
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Klein,  Frieder
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Marschall,  Horst R.
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Scambelluri,  Marco
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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Volltexte (frei zugänglich)

5027580.pdf
(Verlagsversion), 4MB

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Zitation

Schwarzenbach, E. M., Dragovic, B., Codillo, E. A., Streicher, L., Scicchitano, M. R., Wiechert, U., Klein, F., Marschall, H. R., Scambelluri, M. (2024): Mobilization of isotopically heavy sulfur during serpentinite subduction. - Science Advances, 10, 32.
https://doi.org/10.1126/sciadv.adn0641


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5027580
Zusammenfassung
Primitive arc magmas are more oxidized and enriched in sulfur-34 (34S) compared to mid-ocean ridge basalts. These findings have been linked to the addition of slab-derived volatiles, particularly sulfate, to arc magmas. However, the oxidation state of sulfur in slab fluids and the mechanisms of sulfur transfer in the slab remain inconclusive. Juxtaposed serpentinite and eclogitic metagabbro from the Voltri Massif (Italy) provide evidence for sulfur mobilization and associated redox processes during infiltration of fluids. Using bulk rock and in situ δ34S measurements, combined with thermodynamic calculations, we document the transfer of bisulfide-dominated, 34S-enriched fluids in equilibrium with serpentinite into adjacent metagabbro. We argue that the process documented in this study is pervasive along the subduction interface and infer that subsequent melting of these reacted slab-mantle interface rocks could produce melts that display the characteristic oxygen fugacity and sulfur isotope signatures of arc magmas worldwide.