Sulfide resorption during crustal ascent and degassing of oceanic plateau basalts

C. D. J. Reekie (), F. E. Jenner, D. J. Smythe, E. H. Hauri, E. S. Bullock and H. M. Williams
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C. D. J. Reekie: University of Cambridge
F. E. Jenner: The Open University
D. J. Smythe: University of Oxford
E. H. Hauri: Carnegie Institution of Washington
E. S. Bullock: Carnegie Institution of Washington
H. M. Williams: University of Cambridge

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract Mantle plume-related magmas typically have higher chalcophile and siderophile element (CSE) contents than mid-ocean ridge basalts (MORB). These differences are often attributed to sulfide-under-saturation of plume-related melts. However, because of eruption-related degassing of sulfur (S) and the compositional, pressure, temperature and redox effects on S-solubility, understanding the magmatic behavior of S is challenging. Using CSE data for oceanic plateau basalts (OPB), which rarely degas S, we show that many OPB are sulfide-saturated. Differences in the timing of sulfide-saturation between individual OPB suites can be explained by pressure effects on sulfur solubility associated with ascent through over-thickened crust. Importantly, where S-degassing does occur, OPB have higher CSE contents than S-undegassed melts at similar stages of differentiation. This can be explained by resorption of earlier-formed sulfides, which might play an important role in enriching degassed melts in sulfide-compatible CSE and potentially contributes to anomalous enrichments of CSE in the crust.

Date: 2019
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DOI: 10.1038/s41467-018-08001-3

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