Other
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006gecoa..70.1796f&link_type=abstract
Geochimica et Cosmochimica Acta, Volume 70, Issue 7, p. 1796-1806.
Other
2
Scientific paper
The solubility of natural, near-end-member wollastonite-I (>99.5% CaSiO3) has been determined at temperatures from 400 to 800 °C and pressures between 0.8 and 5 GPa in piston-cylinder apparatus with the weight-loss method. Chemical analysis of quench products and optical monitoring in a hydrothermal diamond anvil cell demonstrates that no additional phases form during dissolution. Wollastonite-I, therefore, dissolves congruently in the pressure temperature range investigated. The solubility of CaSiO3 varies between 0.175 and 13.485 wt% and increases systematically with both temperature and pressure up to 3.0 GPa. Above 3.0 GPa wollastonite-I reacts rapidly to the high-pressure modification wollastonite-II. No obvious trends are evident in the solubility of wollastonite-II, with values between 1.93 and 10.61 wt%. The systematics of wollastonite-I solubility can be described well by a composite polynomial expression that leads to isothermal linear correlation with the density of water. The molality of dissolved wollastonite-I in pure water is then log(mwoll)=2.2288-3418.23×T+671386.84×T+logρ×(5.4578+2359.11×T). By combining the present experimental data with literature data on the solubility of quartz (Manning, C.E., Boettcher, S.L., 1994. Rapid-quench hydrothermal experiments at mantle pressures and temperatures. Am. Mineral. 79, 1153 1158.) and wollastonite-I + quartz (Xie, Z., Walther, J.V., 1993b. Wollastonite + quartz solubility in supercritical NaCl aqueous solutions. Am. J. Sci. 293, 235 255.) in pure water, an analogous expression can be derived for the solubility of wollastonite in quartz-saturated aqueous solution as follows: log(mwoll)=2.5930-3660.98×T+671402.32×T+logρ×(-1.3609+6775.13×T).(all temperatures are in°C) This expression adequately describes wollastonite-I solubility between 0.2 3 GPa and 300 800 °C.
Burchard Michael
Fockenberg Thomas
Maresch Walter V.
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