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Gaur, V. P.
- Orbicular Structures in Bundelkhand Granitoid Complex Near Pichhore, Shivpuri District, Madhya Pradesh
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Authors
Affiliations
1 Geology Survey of India, Operation Madhya Pradesh, Bhopal, IN
1 Geology Survey of India, Operation Madhya Pradesh, Bhopal, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No 5 (2004), Pagination: 677-684Abstract
The Paper records the occurrence of large sired proto, single shell and Multi-Shell orbicular structures from the Bundelkhand Granitoid Complex. The orbicular structures are developed in an aplitic granite traversing the coarse grained link granite exposed to the SSW of village Kutawali (24°07'45'': 78°10'20") in pichhore Tehsil of Shivpuri district, Madhya Pradesh. The Core and matrix of the orbicules have identical composition and hence the orbicular structures are classified under Homo-Thrausmatic and Iso-Thrausmatic category. The chemical analyses of the orbicular rocks plot in the Quartz-Monzbnite field in Na2O-K2O and K2O-Na2O-CaO diagram. The composition of the orbicules represents a felsic Parentage: Per!thitic,intergrowth points to the igneous origin of the orbicular structures.Keywords
Orbicular Structures, Bundelkhand Granitoid Complex, Pichhore, Shivpuri District, Madhya Pradesh.
- Copper–Molybdenum–Tungsten Mineralization in Granitoids around Kanchanpur–Thuni Area, Western Bundelkhand Craton, Central India
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Authors
Affiliations
1 Geological Survey of India, Central Region, Bhopal 462 016, IN
1 Geological Survey of India, Central Region, Bhopal 462 016, IN
Source
Current Science, Vol 125, No 5 (2023), Pagination: 561-567Abstract
Highly altered granitoids in the western part of Bundelkhand craton around Kanchanpur and Thuni villages in Shivpuri district, Madhya Pradesh, India, are significantly associated with copper–molybdenum–tungsten mineralization which is manifested as stringers, blebs, clots and fine specks of chalcopyrite, pyrite, molybdenite and scheelite and as vein-fillings associated with hydrothermal alteration within the ore zone and adjacent host rocks. The cumulative strike length of the zone of mineralization (NW–SE) and associated alteration is around 3.5 km. Various mineral assemblages, viz. K-feldspar–biotite–chlorite, K-feldspar–sericite–chlorite and quartz–epidote–chlorite–sericite indicate intense hydrothermal alteration in the area. Analytical results have shown anomalous values for Cu (up to 1530 ppm), Mo (up to 4080 ppm) and W (up to 1449 ppm). Field observations and chemical analysis have been further supplemented by ore microscopic, petrographic, geo-chemical and EPMA studies to identify sulphide phases (of Fe, Cu and Mo) and scheelite. All the field and laboratory studies collectively indicate a probable hydrothermal origin of mineralization in the study area. The present study on Cu, Mo and W mineralization of economic grade in the western Bundelkhand craton has important implications for further metallogenic studies and mineral exploration in the area.Keywords
Craton, Granitoids, Hydrothermal Alteration, Mineral Assemblages, Metallogenic Studies.Full Text
References
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- Copper–Gold Mineralization and Associated Hydrothermal Alteration around Suwara Area, Southern Part of the Bundelkhand Craton, Central India
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Authors
Affiliations
1 Geological Survey of India, Central Region, Bhopal 462 016, IN
1 Geological Survey of India, Central Region, Bhopal 462 016, IN
Source
Current Science, Vol 125, No 6 (2023), Pagination: 678-684Abstract
The structurally controlled copper–gold (Cu–Au) mineralization in the Suwara area in the southern part of the Bundelkhand craton, Central India, is hosted within quartz reefs traversing older granitoids. Mineralization is distinctly associated with hydrothermal alteration (potassic, chloritic and iron alteration in the ore zone and K-metasomatism in the wall rocks). Field observations and laboratory evidence confirm the Fe–Cu–Au association in the study area. Sulphide mineralization is represented by pyrite, chalcopyrite, covellite, chalcocite and bornite occurring as disseminations, stringers and specks within the altered quartz veins, with gold occurring as fine isolated disseminations within quartz and iron oxides. Chemical analysis of surface and subsurface samples showed promising values for Cu (up to 1.0%) and Au (up to 450 ppb) content. Fluid inclusion studies indicated the occurrence of saline mineral fluids (Na– K–Cl-bearing) with the presence of H2O–CO2–CH4 in the mineral system. Overall characteristics of the mineralization and alteration patterns of the prospect indicate that it probably belongs to an iron oxide–copper–gold-type set-up for mineralization. The present study on Cu–Au mineralization from the southern Bundelkhand craton will have significant implications for further exploration and research in the area.Keywords
Craton, Granitoids, Hydrothermal Alteration, Mineralization, Quartz Reefs.Full Text
References
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- Kumar, A., Bind, G. and Hazra, D., Magmatic-hydrothermal origin of granite hosted Cu–Ba mineralization from southern Bundelkhand, Tikamgarh district, Madhya Pradesh, India. Curr. Sci., 2023, 124(1), 13–17.
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