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Pandit, Dinesh
- Chloritization in Paleoproterozoic Granite Ore System at Malanjkhand, Central India: Mineralogical Studies and Mineral Fluid Equilibria ModellingIn the Malanjkhand Granitoid (MG), chlorite occurs in micro-domain along with mineral assemblage biotite, horn
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1 National Centre for Antarctic and Océan Research, Goa 403 804, IN
1 National Centre for Antarctic and Océan Research, Goa 403 804, IN
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Current Science, Vol 106, No 4 (2014), Pagination: 565-581Abstract
In the Malanjkhand Granitoid (MG), chlorite occurs in micro-domain along with mineral assemblage biotite, hornblende, quartz, K-feldspar and plagioclase. Chloritization of biotite is the most dominant processes during the hydrothermal alteration in MG ore system followed by alteration of hornblende. Chlorite composition revealed two major types of substitution mechanism, i.e. couples Tschermak (TK) and di-trioctahedral (DT) which correspond to the coupled exchange of Mg and Fe for Al between end-members clinoclore-daphanite and amesite. TK substitution is more prominent than DT substitution between endmembers of chlorite solid solution during hydrothe rmal alteration in MG. Temperature estimates for chloritization using chlorite geothermometry range from 110°C to 400°C and are consistent with the temperature of hydrothermal mineralization (200-375°C) at Malanjkhand. The chloritization process incorporates K+ and Ca2+ ions in the hydrothermal fluids. Therefore, it is inferred that the chloritization in granitic plutons is due to alteration of biotite and hornblende which increases the oxygen fugacity and activities of K+ and Ca2+ ions in the hydrothermal fluid.Keywords
Activity Ratios, Alteration, Chloritization, Granite, Hydrothermal Fluids.- Crystallization Evolution of Accessory Minerals in Palaeoproterozoic Granites of Bastar Craton, India
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Authors
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1 Department of Geology, Centre of Advanced Study, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
1 Department of Geology, Centre of Advanced Study, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
Source
Current Science, Vol 114, No 11 (2018), Pagination: 2329-2342Abstract
The Malanjkhand and Dongargarh granitoids are compared to study the role of accessory minerals (apatite, zircon, titanite and titanomagnetite) to understand crystallization evolution of Palaeoproterozoic granitic magmatism in the Bastar Craton, central India. Two varieties of titanite (magmatic and hydrothermal types) are observed in the Palaeoproterozoic granitoids. Occurrence of zircon, apatite, titanite and titanomagnetite as accessory phases in the Palaeoproterozoic granitoids indicates that the early stage of crystallization of granitic magma was saturated with Zr, P and Ti. Petrography and mineral equilibria reaction suggest that magmatic titanite in the Palaeoproterozoic granitoids was formed due to hydration of amphiboles and biotites which favours high f O2 and f H2O conditions. Apatite composition suggests that it was formed in the granitic magma at nearliquidus to near-solidus temperature (900–1000°C) which increased fugacity ratio log(fH2O/fHF) and also controlled the halogen budget during magma crystallization. Relatively high halogen content in the apatites from the Malanjkhand Granitoid (MG) indicates that the parental magma was enriched in F and Cl compared to Dongargarh Granitoids (DG), implying a dominant role of halogens in metal transportation and hydrothermal mineralization. In MG, apatite was the earl iest phase to be crystallized in granitic magma followed by zircon and titanite whereas, in DG, crystallization of zircon was followed by apatite and titanite. Two contemporaneous plutons, DG and MG, represent a unique Palaeoproterozoic granitic magmatism wherein early progressive crystallization is dominated by accessory mineral saturation in a relatively static environment with constant magma composition.Keywords
Accessory Minerals, Bastar Craton, Dongargarh, Granite, Malanjkhand.References
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1 Mantle Petrology Laboratory, Department of Geology, Centre of Advanced Study, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
1 Mantle Petrology Laboratory, Department of Geology, Centre of Advanced Study, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
Source
Current Science, Vol 117, No 5 (2019), Pagination: 858-865Abstract
Tourmaline group of minerals, the primary source of boron, are cyclosilicates which are widespread in the earth’s crust. Earlier studies involving the nomenclature and classification of tourmaline were based on the measurement of its common elements (Al, Mn, Fe, Mg, etc.). In all such studies, boron was assumed to be fixed in the composition and restricted only to the triangular structural site. However, recent discovery of the presence of boron in the tetrahedral structural site as well, necessitates the measurement of boron content. Much of the earlier attempts to measure boron were based on solution methods, and electron microprobe analysis (EPMA) was the least used due to low levels of detection of its analytical crystals. In the present study, we quantify boron – particularly along with fluorine and other major elements – in tourmaline grains using high-sensitivity PC3 analytical crystal. We found that the measured boron content slightly exceeds that of the stoichiometrically calculated boron. Also, the studied tourmalines come under the alkali group in general and belong to the schorl– dravite solid solution series in particular.Keywords
Boron, Electron Probe Micro Analysis, Pegmatite, Tourmaline.References
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1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
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Current Science, Vol 120, No 5 (2021), Pagination: 759-763Abstract
No Abstract.References
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