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Parthasarathy, T. N.
- Geology, Structure and Uranium Mineralisation in Kulu, Himachal Himalaya
Authors
1 Atomic Minerals Division, Department of Atomic Energy, West Block No. VII, R. K. Puram, New Delhi 110022, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 20, No 3 (1979), Pagination: 95-102Abstract
Uranium mineralisation as Uraninite vein filling is seen in joints and fractures in the quartzites exposed within an eroded cover of crystallines, tectonically thrust from east and NE in Kulu-Banjar area of Himachal Pradesh. Analysis of the joints suggests a tensional origin and can be related to the three main folding events identified from the fold structure in the quartzites. It is believed that the mineralisation is essentially under low temperature-pressure conditions as there is a remarkable absence of large scale wallrock alteration.U-Pb dating of six Uraninite samples reveals two distinct episodes of mineralisation at 1200 m.y. and 700 m.y. confirming the Precambrian age of Uranium mineralisation, and associated metasediments.
- The Conglomerates of Middle Andaman and their Geologic Significance
Authors
1 Atomic Minerals Division, Hyderabad 500016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 2 (1984), Pagination: 94-101Abstract
Fluvial conglomerates, separating two flysch sequences have been identified at several places in Middle Andaman island. These conglomerates are characterised by poorly sorted, polymictic, well-rounded to sub-rounded pebbles, and consist of black cherty quartzite, vein quartz, slaty phyllite, andesite-basalt, reddish jasper, limestone, serpentinite and tuffaceous rocks. The linear continuity of the conglomerate is broken and its thickness much affected by structural deformation.The conglomerates appear to have been initially deposited as lags on steep slopes and later resedimented in deep waters of the basin. It is implied thereby that the Middle Andaman conglomerate represents unconformable unit separating two sequences of flysch beds, and marking a period of tectonic uplift. It is suggested that the uplift of the source area followed the deposition of the older flysch sequence and perhaps the basalt andesitic volcanism also. Such an uplift may be linked with the oft-suggested subduction of Indian Ocean plate along Indo-Burma-Andaman-Nicobar-Sunda arc boundary.
- Physical, Optical and Chemical Characterization of Brannerite from the Ladikabas Area, Sikar District, Rajasthan
Authors
1 Atomic Minerals Diivision, Begumpet, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 47, No 2 (1996), Pagination: 259-262Abstract
Brannerite occurs as subrounded to subangular grains (0.05mm to 20mm) in marble, quartzite, carbonate rock, quartz biotite schist and albitite, and in soils derived from these lithounits of Ajabgarh Group of metasediments around Kachera dam-Ladikabas area of Sikar district, Rajasthan. It alters to rutile along the margins and fractures. The analysis shows 30.6-36.9% UO3, 0.9 to 3.2% UO2, 33.40% TiO2 and 3.4% total (REE)2O3.- Occurrence of Ultramafic-Mafic Rocks of Komatiitic Affinity in the Abujhrnar Basin of Bastar Craton (ME), India
Authors
1 Atomic Minerals Division, Hyderabad-500 016, IN