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Randive, K. R.
- Occurrence of REE Mineralization in the Layered Gabbros of Phenai Mata Igneous Complex, Gujarat, India
Abstract Views :419 |
PDF Views:150
Authors
Affiliations
1 Post Graduate Department of Geology, RTM Nagpur University, Nagpur 440 001, IN
2 National Centre of Excellence in Geoscience Research (NCEGR), Geological Survey of India, Bengaluru 560 070, IN
1 Post Graduate Department of Geology, RTM Nagpur University, Nagpur 440 001, IN
2 National Centre of Excellence in Geoscience Research (NCEGR), Geological Survey of India, Bengaluru 560 070, IN
Source
Current Science, Vol 112, No 02 (2017), Pagination: 231-235Abstract
Among the magmatic rocks, carbonatites are known to possess the highest concentration of rare earth elements (ΣREE = 72-15,515 ppm), and they have the best REE mineral resourses. Rare earth deposits in igneous rocks have been grouped into five distinct categories differing in the provenance and evolution of magma and in the rock types hosting mineralization, viz.: (i) carbonatites, (ii) peralkaline silica-undersaturated rocks, (iii) peralkaline granites and pegmatites, (iv) pegmatites associated with sub- to metaluminous granites, and (v) Fe oxide- phosphate deposits. Occurrence of REE minerals in rocks other than those mentioned above, especially mafic and ultramafic rocks is scantily documented; only recently, they were looked upon as hosts of REE-mineralization.Full Text
- Iron Oxide-Copper-Gold Mineralization at Thanewasna, Western Bastar Craton
Abstract Views :317 |
PDF Views:166
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