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Experimental determination of composition dependence of hydrous silicate melts on sulfate solubility

Ducea, Mihai N. and McInnes, Brent I. A. and Wyllie, Peter J. (1999) Experimental determination of composition dependence of hydrous silicate melts on sulfate solubility. European Journal of Mineralogy, 11 (1). pp. 33-43. ISSN 0935-1221. doi:10.1127/ejm/11/1/0033.

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We measured the solubility of SO_3 in quartz-normative and nepheline-normative compositions in the system Na_2O-Al_2O_3-SiO_2-H_2O at temperatures from 800-825 °C and pressures between 1.5-1.7 kbar. We added 1.5, 3, 10 or 15 wt% CaSO_4 to two H_2O-saturated synthetic compositions near the eutectics in quartzalbite-H_2O and nepheline-albite-H_2O. The low sulfate solubilities measured in the quartz-normative quenched glasses (0.06-0.12% SO_3) are similar to previous determinations on quartz-normative melts from natural rock compositions. The sulfate contents of quenched glasses in the nepheline-normative system are up to 6 times higher (0.17-0.36 %SO_3). Precipitation of anhydrite in the quartz-normative melt requires addition of about 6 wt% CaSO_4 at 800°C, and 10 wt% CaSO_4 at 820°C. In contrast, < 1.5 wt% CaSO_4 added to the nepheline-normative liquid is sufficient to cause precipitation of haüyne or an immiscible sulfate-rich liquid. We conclude that the sulfate solubility in hydrous magmas is significantly influenced by silica activity (melt alkalinity) and SiO_2 concentration in melts.

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Ducea, Mihai N.0000-0002-5322-0782
Additional Information:© 1999 E. Schweizerbartsche Verlagsbuchhandlung. Received 3 April 1998; Accepted 31 August 1998. This research was supported by the Earth Science Section of the National Science Foundation, Grant EAR-9303967. We appreciate the assistance of Paul Carpenter with the microprobe analyses. Journal reviews by B. Mysen, M. Pichavant, B. Clemente, and B. Scaillet, as well as constructive suggestions from chief editor L. Ungaretti have greatly contributed to improving the quality of the manuscript. This is California Institute of Technology, Division of Geological and Planetary Sciences contribution no. 5666.
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Subject Keywords:experimental, sulfate, solubility
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Caltech Division of Geological and Planetary Sciences5666
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ID Code:63608
Deposited By: Tony Diaz
Deposited On:12 Jan 2016 23:21
Last Modified:10 Nov 2021 23:18

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