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Purohit, R. K.
- Geochemistry and Petrography of U-Th-Y Mineralisation in Alkali Feldspar Granite (Alaskite) Dykes around Dhanota, Mahendragarh District, Haryana, India
Abstract Views :186 |
PDF Views:2
Authors
Affiliations
1 Atomic Minerals Division, Department of Atomic Energy, New Delhi-110066, IN
2 Atomic Minerals Division, Department of Atomic Energy, Hyderabad-500016, IN
1 Atomic Minerals Division, Department of Atomic Energy, New Delhi-110066, IN
2 Atomic Minerals Division, Department of Atomic Energy, Hyderabad-500016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 55, No 2 (2000), Pagination: 189-196Abstract
Radioactive alkali feldspar granite (alaskite) occurs as dykes within the Proterozoic granite gneiss around Dhanota. Samples have assayed 0.011 to 0.16% U3O8 and 0.005 to 0.16% ThO2. Yttrium values range from 250 to 800 ppm. Uranothorite occurs in association with zircon, xenotime, magnetite, hematite, sphene and goethite. The U-Th-Y mineralisation in alaskites of Dhanota is disseminated syn-magmatic intrusive type.Keywords
Economic Geology, Geochemistry, Petrography, Alaskite Dyke, Xenotime, Uranothorite, Dhanota, Haryana.- Petrography and Mineral Chemistry of the Radioactive Migmatitic Rocks around Kudri, Sonbhadra District, U.P. and its Implication on Uranium and Rare Earth Mobility and Genesis
Abstract Views :182 |
PDF Views:2
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad-500 0 16, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, New Delhi - 110 066, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad-500 0 16, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, New Delhi - 110 066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 1 (2006), Pagination: 87-94Abstract
The Precambrian migmatites around Kudri host uranium, rare earth and zirconium mineralization, manifested, respectively in the form of discrete uraninite, allanite and zircon. Mineralization is mostly in the biotite-Rich melanosome (restite), albite-Rich leucosome and mesosome (mobilizate). Uraninite with UO2 content of 79.93-82.45% (av.81.36%), and content of high Th (ThO2:2.98-5.71%, av.4.37%) and high REE (RE2O3: 0.82-2.11, av.1.41%) and chemical age (736-929 Ma, av.824 Ma) of uraninite (n=14) point towards its origin during Neoproterozoic (av. 824 Ma) probably by epigenetic, high-Temperature, synmagmatic origin which later subjected to dissolution and alteration by hydrothermal process. However, textural evidence of corrosion of erstwhile euhedral uraninite suggests its subsequent dissolution and alteration, together with expulsion of REE, possibly by a saline, moderately acidic hydrothermal (100-300°C), reducing solution at a lower pressure, related to regional tectonic episode.Keywords
Petrography, Mineral Chemistry, Migmatite, Uraninite Dissolution, Kudri, U.P.- Uranium Occurrence in Proterozoic Chilpi Group, near Kanhari, Kawardha District, Chhattisgarh
Abstract Views :234 |
PDF Views:78
Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, AMD Complex, Civil Lines, Nagpur 440 013, IN
2 Atomic Minerals Directorate for Exploration and Research, AMD Complex, Begumpet, Hyderabad 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, AMD Complex, Civil Lines, Nagpur 440 013, IN
2 Atomic Minerals Directorate for Exploration and Research, AMD Complex, Begumpet, Hyderabad 500 016, IN
Source
Current Science, Vol 107, No 3 (2014), Pagination: 364-367Abstract
No Abstract.- LREE–Nb Mineralization in the South Western Part of Ambadongar Carbonatite Complex, Chhota Udepur District, Gujarat, India
Abstract Views :574 |
PDF Views:80
Authors
B. Nagabhushanam
1,
S. Durai Raju
2,
K. L. Mundra
3,
S. D. Rai
1,
R. K. Purohit
1,
M. B. Verma
1,
L. K. Nanda
1
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, IN
2 Atomic Minerals Directorate for Exploration and Research, Beach Sand and Offshore Investigations, Thiruvananthapuram 695 012, IN
3 Atomic Minerals Directorate for Exploration and Research, Western Region, Jaipur 302 033, IN
1 Atomic Minerals Directorate for Exploration and Research, Hyderabad 500 016, IN
2 Atomic Minerals Directorate for Exploration and Research, Beach Sand and Offshore Investigations, Thiruvananthapuram 695 012, IN
3 Atomic Minerals Directorate for Exploration and Research, Western Region, Jaipur 302 033, IN
Source
Current Science, Vol 114, No 08 (2018), Pagination: 1608-1610Abstract
The Ambadongar sub-volcanic carbonatite alkali complex is located about 140 km east of Vadodara, Chhota Udepur district, Gujarat, India and falls in Survey of India Toposheet No. 46 K/1. The complex intrudes Bagh sandstone (Cretaceous) and overlying Deccan basalts (Eocene) and is situated in the Narmada rift zone. The carbonatites came into prominence in the early 1960s with significant discoveries of fluorite and conspicuous radioactivity located near Chhota Udepur, at Ambadongar, the erstwhile Baroda district, Gujarat. Earlier workers have clarified many aspects of the carbonatite complex.References
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- Sukheswala, R. N. and Udas, G. R., Sci. Cult., 1963, 29, 563–568.
- Subramaniam, A. P. and Parimoo, M. L., Nature, 1963, 198, 563–564.
- Viladkar, S. G., In International Carbonatite Workshop, GMDC Science & Research Centre, Ahmedabad, 5–11 December 1996, pp. 1–66.
- Viladkar, S. G., Bull. Geol. Soc. Finland, 1981, 17–28.
- Doroshkevich, A. G., Viladkar, S. G., Ripp, G. S. and Burtseva, M. V., Can. Mineral., 2009, 47, 1105–1116.
- Viladkar, S. G., In Geochemistry–Earths System Processes (ed. Panagiotaras, D.), 2012, pp. 485–500.
- Van Gosen, B. S., Open File Report 2009-1005, U.S. Department of the Interior and US Geological Survey, 2009, pp. 1–27.