Other
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..393g&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, Issue 3, pp.393-410
Other
10
Scientific paper
The dominant reaction determining the chemistry of fluids in a geothermal system of the New Zealand type consists of the conversion of primary plagioclase by CO 2 to calcite and clays with log pco 2 = 15.26 - 7850/( t + 273.2), temperature t in °C. Subsequent reactions involving secondary minerals control relative CO 2 -H 2 S-contents. The distribution of mineral phases throughout a geothermal system reflects the stepwise conversion of thermodynamically unstable primary phases through a series of intermediate, metastable phases to a thermodynamically stable, secondary assemblage. The relative stabilities of these phases was evaluated on the basis of their solubilities, the least soluble aluminiumsilicate representing the thermodynamically most stable phase under a given set of conditions. Observed assemblages of secondary minerals in geothermal systems represent indicators allowing mineral/fluidinteraction conditions to be evaluated on the basis of multi-component mineral stability diagrams.
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