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The stability and composition of sulfate melts in arc magmas

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Abstract

The stability field and composition of immiscible sulfate melts in equilibrium with silicate magmas has been determined using experiments over a range of crustal pressures, allowing an assessment of their possible role in transporting sulfur into the sub-volcanic arc and porphyry copper deposit systems. Experimental starting materials were based on natural trachyandesite and trachydacite compositions, with 3.5–7 wt% H2O and 3.5–5.5 wt% sulfur added to produce large, analyzable amounts of sulfate phases. Conditions ranged over 800–1200 °C, 0.2-1GPa and ƒO2 > NNO + 2.5. Sulfate melts formed at temperatures above 1000 °C at 0.75 and 1 GPa and above 900 °C at 0.2 GPa, suggesting some pressure dependence on their stability. At temperatures below 1100 °C sulfate melts and anhydrite crystals commonly coexist. Sulfate melts quenched to an intergrowth that was difficult to prepare for analysis. However, the composition was approximated by EPMA and further constrained by mass balance calculations. Sulfate melts were dominated by CaO and SO3, but also contained, in order of decreasing abundance, Na2O, K2O, MgO, FeO, Cl and P2O5. Chlorine showed a particular preference for the sulfate melt relative to the coexisting silicate melt, and calculated partition coefficients for sulfate/silicate melts were 5–13 at 1200 °C, 0.75–1 GPa. Experimental data show that, in the absence of an exsolved, hydrous fluid phase, sulfate melts can form in natural arc magmas at near-liquidus temperatures ≥ 1000 °C, assuming that magmas are oxidized and contain sufficient sulfur (> 2000–3000 ppm S). These results suggest that sulfate melt could be an important component in transporting sulfur as well as chlorine to shallow levels in the crust for hydrous magmas under a specific range of conditions. Both the non-quenchable and water-soluble nature of sulfate melts (and anhydrite) make them difficult to identify, unless trapped as mineral inclusions similar to the “wormy anhydrite” trapped in high-temperature amphiboles from Yanacocha, Peru.

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the source of additional water is the hydration of sulfate powders used as starting materials

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Acknowledgements

Support for this project came from National Science Foundation grant EAR-1624547. Ion probe time was supported by grant IMF608/1016. We would like to express our gratitude to Frank Tepley, Stuart Kearns and Ben Buse for assistance with microprobe analyses and to Richard Hinton and Cristina Talavera for help with SIMS analyses. This study benefited greatly from discussions with Brian Tattitch and from careful reviews by Zoltan Zajacz and Matteo Masotta.

Funding

This study was funded by the National Science Foundation (NSF grant EAR-1624547). Ion probe time at the Edinburgh Ion Microprobe Facility was supported on grant IMF608/1016.

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  1. College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, 97331-5501, USA

    Michael C. Hutchinson & John H. Dilles

  2. School of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, UK

    Richard A. Brooker & Jon Blundy

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All authors contributed to the conception of the study, and to experimental design. Experimental work, sample preparation and analytical work was performed by Michael Hutchinson with assistance from Richard Brooker. All authors contributed to the interpretation of data. The first draft of the manuscript was written by Michael Hutchinson and all authors contributed to editing of the manuscript. All authors read and approved the final manuscript.

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Hutchinson, M.C., Brooker, R.A., Dilles, J.H. et al. The stability and composition of sulfate melts in arc magmas. Contrib Mineral Petrol 175, 92 (2020). https://doi.org/10.1007/s00410-020-01729-6

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