Compositional controls on melting and dissolving a salt into a ternary melt

Hatton, D. C. and Woods, A. W. (2007) Compositional controls on melting and dissolving a salt into a ternary melt. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science, 463. pp. 1211-1230. DOI 10.1098/rspa.2007.1819

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Abstract

We explore theoretically the controls on dissolution of salt A, in an undersaturated brine of salts A and B. We show that, as the concentration of B increases, the dissolution rate of A decreases, for brine of given temperature. We also show that there is a sharper decrease in dissolution rate with increasing concentration, for concentrations of B above a critical value, where B limits the equilibrium concentration. We explore the implications of the predictions for dissolution of KCl or NaCl, by a mixed brine of NaCl and KCl, a common reaction that may arise in dissolution of evaporites. We predict that, with mixed-composition brine, KCl crystals dissolve more rapidly than NaCl crystals, unless the (far-field) brine is nearly saturated in KCl. We also predict that the dissolution rate of these salts is largely independent of fluid temperature and is controlled by compositional diffusion.

Item Type: Article
Uncontrolled Keywords: 2007 AREP BPI 2007 P IA54
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Proceedings of the Royal Society A: Mathematical, Physical and Engineering Science
Volume: 463
Page Range: pp. 1211-1230
Identification Number: 10.1098/rspa.2007.1819
Depositing User: Sarah Humbert
Date Deposited: 16 Feb 2009 13:02
Last Modified: 23 Jul 2013 10:07
URI: http://eprints.esc.cam.ac.uk/id/eprint/363

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