Thermodynamic Stability of Microcline in Hydrothermal Ore System at Malanjkhand Copper Deposit, India
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Abstract
Mineral solubility calculations were used to establish the phase relations for the microclinization process at elevated temperature and pressure conditions. Mineral phases identified in the mineralization zone at the Malanjkhand, are the key component to construct hydrothermal alteration reactions is involving plagioclase, microcline, kaolinite, biotite, chlorite, and chalcopyrite. Theoretical modeling using standard state thermodynamic database suggested that the activity of K+ ions regulate the microclinization process in the temperature range 300oC to 350oC with an insignificant consequence of pressure during a hydrothermal alteration in the Malanjkhand copper deposit. Potash-rich hydrothermal solution promotes the deposition of ore minerals at Malanjkhand. Correlation of temperature with equilibrium kinetic and hydrothermal alteration processes are indicative of mineral-mineral and mineral-fluid stability in natural environments. The results of this study are very useful in crucial mineral exploration planning and developments of theoretical models of hydrothermal fluid-granite reactions.
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