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Ramachandra, H. M.
- Charnockites from Hullahalli, Mysore District, Karnataka State
Abstract Views :178 |
PDF Views:2
Authors
Affiliations
1 Department of Geology, University of Mysore, Manasagangotri, Mysore, IN
1 Department of Geology, University of Mysore, Manasagangotri, Mysore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 18, No 7 (1977), Pagination: 331-337Abstract
Charnockites have been noticed in the canal sections near Hullahalli, south of Mysore city. From their field, petrographic and chemical character, it is argued that they were formed as a result of granulite grade metamorphism and migmatization of pelites and intercalated earlier basic igneous rocks and pelites of the Sargur schist complex.
- Structural History of Sargur Supracrustals and Associated Gneisses, Southwest of Mysore, Karnataka
Abstract Views :197 |
PDF Views:2
Authors
Affiliations
1 Department of Geology, University of Mysore, Manasa Gangotri, Mysore-570006, IN
2 Palaeomagnetic Division, Dy. D.G.'s Cell, Geological Survey of India, Central Circle, Nagpur, IN
1 Department of Geology, University of Mysore, Manasa Gangotri, Mysore-570006, IN
2 Palaeomagnetic Division, Dy. D.G.'s Cell, Geological Survey of India, Central Circle, Nagpur, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 20, No 2 (1979), Pagination: 61-72Abstract
Results of structural investigations in Sargur schist complex around Sargur, Dodkanya and Gundlupet indicate four major fold episodes and associated fault movements. These episodes have resulted in the formation of antiform-synform structures(F2), extensive interleaving and dome-basin patterns (F2 and F3). Tectono-metamorphic studies have brought out the polymetamorphic (with late retrogressive) and polydeformational nature of the terrain. At least two migmatization events and (anatectic) granitic intrusions (associated with F2 and F3) have been recognised. A classification of gneisses of the area has been made and reasons and criteria for the recognition of 'Kabini gneiss' are given.
The tectonic relations between the Sargurs, Dharwars and 'Khondalite-Char- nockites', point to structural continuity of the Sargur terrain with the 'Khondalite-Charnockite' terrain to its south.
- Anorthosites from Hullahalli, Mysore District Karnataka State
Abstract Views :221 |
PDF Views:181
Authors
Affiliations
1 Department of Geology, Manasagangotri, Mysore-570 006, IN
1 Department of Geology, Manasagangotri, Mysore-570 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 19, No 6 (1978), Pagination: 277-280Abstract
The note records the occurrence of gabbroic anorthosites in the Kabini right bank canal sections, south of Hullahalli, close to the spot from where the same authors had originally described charnockites, and discusses the origin of these gabbroic anorthosites, with particular reference to their occurrence in Sargur type high grade terrains of Karnataka.Full Text
- Aula Sarangapani Janardhan (1938-2004)
Abstract Views :188 |
PDF Views:136
Authors
Affiliations
1 Department of studies in Geology, University of Mysore, Mysore, IN
2 AMSE Wing, Geological Survey of India, Bangalore, IN
1 Department of studies in Geology, University of Mysore, Mysore, IN
2 AMSE Wing, Geological Survey of India, Bangalore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 65, No 2 (2005), Pagination: 259-260Abstract
No Abstract.Full Text
- Iron Oxide-Copper-Gold Mineralization at Thanewasna, Western Bastar Craton
Abstract Views :187 |
PDF Views:106
Authors
Affiliations
1 Geological Survey of India, Central Region, Nagpur 440 006, IN
2 RTM Nagpur University, Nagpur 440 001, IN
3 Geological Survey of India, Bengaluru 566 070, IN
4 Geological Survey of India, Southern Region, Hyderabad 500 068, IN
1 Geological Survey of India, Central Region, Nagpur 440 006, IN
2 RTM Nagpur University, Nagpur 440 001, IN
3 Geological Survey of India, Bengaluru 566 070, IN
4 Geological Survey of India, Southern Region, Hyderabad 500 068, IN
Source
Current Science, Vol 112, No 05 (2017), Pagination: 1045-1050Abstract
Iron oxide-copper-gold (IOCG) at Thanewasna, Maharashtra, India is a new genetic type of ore deposit, being reported from the western margin of Bastar craton, based on integrated field, drilling, mineral chemistry and Raman microprobe studies. It is the fourth such IOCG type being reported from India. Hydrothermal mineralization is structurally confined to en echelon dilatational quartz-chlorite veins along NW-SE trending brittle-ductile shear zone hosted in calc-alkaline granitoid. The mineralization is characterized by chalcopyrite, magnetite and barite which occur as dissemination, stringers and veins associated with hydrothermal K-alteration and chlorite alteration. Chemical analysis shows significant amounts of Cu, Fe, Ba and anomalous Au content. Ore petrography and scanning electron microscope and electron probe micro analyser studies show assemblages of Cu-Fe-Au-Ag-Ni-Ba-REE minerals typical of IOCG type deposits at Thanewasna. Ore textures, mineralogy and alteration characteristics are typical of IOCG-type deposits, further supported by mineral chemistry of magnetite (V versus Ti/V) using EPMA, and thus define a IOCG metallogenic province in Thanewasna area with significant implications for future exploration.Keywords
Hydrothermal Mineralization, IOCG, Mineral Chemistry, Ore Deposits.Full Text