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Shashidharan, K.
- Tectonically-Controlled Gold Mineralisation in Chigargunta Area, South Kolar Schist Belt, Chittoor District, Andhra Pradesh
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Authors
Affiliations
1 Geological Survey of India, Southern Region, Bangalore 560011, IN
1 Geological Survey of India, Southern Region, Bangalore 560011, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 27, No 6 (1986), Pagination: 517-526Abstract
Several parallel to sub-parallel auriferous mineralised zones of economic significance occur over a strike length of 3 km and spread over a width of about 1 km in 'Chigargunta area of South Kolar schist belt. The host rocks for mineralisation are metamorphosed basalt and acid tuff ('Champion gneiss'). The mineralised zones represent ductile shear zones transecting the regional north-south trending schistosity (S2) at low angle. The pre-existing planar and linear fabrics of the rocks have been rotated into parallelism with the shear zone. The shear zones display mylonitic foliation with prominent downdip lineation, folds of variable orientation, boudinaging and crenulations. Such deformation features are confined only to these strongly tectonised zones believed to have evolved by simple shear deformation. A progressive grain size reduction accompanied by hydrothermal retrogressive metamorphism of the amphibolite facies host rocks culminates laterally into the centre of the mineralised zones with lower grade greenschist assemblage. Nondilatant pegmatite veins and some high temperature alteration minerals indicate possible strain heating. The auriferous lodes occurring in Kolar Gold Field might have a simiiar tectonic evolution.- The Study of the Relationship between the Soil Chemistry and all Water System in Parts of Kuhi Mineral Belt Area, Nagpur District, Maharashtra
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Authors
Affiliations
1 Geological Survey of India, Central Region, Seminary Hills, Nagpur - 440 006, IN
1 Geological Survey of India, Central Region, Seminary Hills, Nagpur - 440 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 4 (2008), Pagination: 557-568Abstract
The paper deals with the relationship between soil chemistry, surface & sub-surface water chemistry and geology of the Kuhi mineral belt, Nagpur district, Maharashtra. Water samples were collected from shallow aquifers and surface water and were analyzed for major ions and trace elements. The study was also made to assess the suitability of these waters for irrigation use. Topsoil samples were collected and analyzed for trace elements. Chemical analysis shows that majority of the groundwater of the area is calcium bicarbonate type. Statistical analysis determines high positive correlation values for cobalt and nickel in water as well as soil. The spatial distribution of Co, Ni, in soil and Co, Ni and Pb in groundwater are nearly similar. Water samples, 7 out of 46 were found un-suitable for irrigation use based on RSC, salinity hazard and Boron concentration parameters. The surface water samples of Nag River show decreasing concentration of major ions and trace elements along the flow. Based on field and laboratory observations it was found that the Nag River water is suitable for irrigation even though it contains high detergents with objectionable colour, taste and odour.Keywords
Irrigation, Trace Elements, Mineralisation, Water Quality, Sakoli Fold Belt, Maharashtra.- Economic Potentiality of New Gold Mineralisation in South Kolar Schist Belt
Abstract Views :173 |
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Authors
Affiliations
1 Geological Survey of India, IN
1 Geological Survey of India, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 29, No 2 (1987), Pagination: 230-239Abstract
Auriferous zones are confined to ductile shear zones in the mafic unit (metabasalt/metagabbro) as well as in the felsic unit ('Champion gneiss'). The occurrence of significant gold mineralisation in the' Champion gneiss' comprising quartzo-feldspathic schist is being reported for the first time.
Low grade (about 4 grammes per tonne) gold reserve of the order of 4.7 million tonnes under all categories (probable+possible) in the new prospect has been established.