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• W2068415096 abstract "The Paleoproterozoic Malanjkhand Granitoid (MG) pluton in the Central India was studied to constrain the depth of emplacement, upward magma transport rate, and quantification of physicochemical condition of sulfide deposition. In this study, the magmatic and hydrothermal epidotes are of two varieties, reported from a mineralized granitoid. In the MG, composition of magmatic epidotes (pistachite – Ps: 21.6–31.1 mole%) and hydrothermal epidotes (Ps: 22.6–31.1 mole%) are overlapping in terms of mole percent of pistachite component. It does not provide any significant discrimination between the two varieties. Presence of oscillatory zoning in magmatic epidotes indicates that there was cyclic change in the oxygen fugacity or bulk composition of granitic magma during crystallization. Al-in-hornblende barometry indicates that the MG crystallized under 2–5.6 kbar pressure and high oxidation state (FMQ-HM) conditions, inferred from Fe/(Fe + Mg) ratio in hornblende (0.36–0.51) over wide range of temperature (800–650 °C). Partial dissolution of epidote indicates an average 6 years time that corresponds to upward transport rates 0.45 km/year for magma migration in the crust. Rapid upward magma migration in most cases was probably through dyke mechanism, which is also the most appropriate model to understand the emplacement of granitic magma responsible for the formation of Malanjkhand pluton. In the Malanjkhand ore deposit, hydrothermal epidotes associated with major sulfide phases (chalcopyrite and pyrite) suggest that they equilibrated with the mineralizing ore fluid. Hydrothermal epidotes were formed over a wide range of temperature (147–424 °C). From mineral–fluid equilibria modeling it was inferred that low to moderate temperature, moderate to high fO2 (>HM buffer) and low fS2 conditions were favorable for formation of hydrothermal epidotes. Interaction between hydrothermal epidote with mineralizing ore fluid in the wall rock would raise the log(aCa2+/aH+2) ratio that brings a fall in pH values, followed by potassic alteration, which promotes the deposition of sulfide ores at Malanjkhand. Sulfide mineralization in the MG represents a unique Paleoproterozoic granite ore system." @default.
• W2068415096 created "2016-06-24" @default.
• W2068415096 creator A5003911766 @default.
• W2068415096 creator A5042367456 @default.
• W2068415096 creator A5042790520 @default.
• W2068415096 date "2014-12-01" @default.
• W2068415096 modified "2023-10-12" @default.
• W2068415096 title "Constrains from magmatic and hydrothermal epidotes on crystallization of granitic magma and sulfide mineralization in Paleoproterozoic Malanjkhand Granitoid, Central India" @default.
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• W2068415096 doi "https://doi.org/10.1016/j.chemer.2014.04.008" @default.
• W2068415096 hasPublicationYear "2014" @default.
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