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The Solubility of Some Alkali-Bearing Zr Minerals in Hydrothermal Solutions

Published online by Cambridge University Press:  10 February 2011

S. U. Aja ,
S. A. Wood  and
A. E. Williams-Jones
S. U. Aja
Affiliation:
Department of Geology, Brooklyn College, Brooklyn NY 11210, [email protected]
S. A. Wood
Affiliation:
Department of Geology and Geological Engineering, University of Idaho, Moscow, ID 83843
A. E. Williams-Jones
Affiliation:
Department of Earth and Planetary Sciences, McGill University, Montreal, H3A 2A7, Canada
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Abstract

The hydrolytic dissolution of some Zr-bearing minerals has been measured in aqueous KCl and KF solutions. Depending on the mineral being investigated, Zr concentrations varied from about 9 ppb to nearly 40 ppm in equilibrated solutions; this validates the notion of Zr mobility in some crustal fluids. At 50 °C, ΔfG were determined (using the measured solubility products) for Na catapleiite, elpidite, vlasovite and weloganite to be -4654.2±5.6, -7391.0±11.6, -5181.0±7.3 and -7130.5±1.0 kJ/mol, respectively. Calculated phase relationships amongst the zirconosilicates found at the Strange Lake peralkaline complex indicate that elpidite and gittinsite cannot coexist stably implying a two-stage hydrothermal mineralization process.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 432: Symposium S – Aqueous Chemistry and Geochemistry of Oxides , 1996 , 69
Copyright
Copyright © Materials Research Society 1997

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