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Sen, D. B.
- Geological Evolution and Uranium Mineralisation of Chhinjra Area, Kulu District, Himachal Pradesh
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1 Atomic Minerals Division, Department of Atomic Energy, West Block VII, R.K. Puram, New Delhi-110 066, IN
1 Atomic Minerals Division, Department of Atomic Energy, West Block VII, R.K. Puram, New Delhi-110 066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 46, No 2 (1995), Pagination: 107-116Abstract
Several shear-controlled and fracture-filled/disseminated type uranium occurrences are known in the Rampur Window. This paper presents the geology and genetic aspects of fracture-filled type of mineralisation in Chhinjra area on the basis of recent stratigraphical, geochronological and tectonic data. Based on the angular unconformity between Manikaran quartzites and overlying chlorite phyllites, the geological evolution of Chhinjra area has been reconstructed in two stages: Pre-unconformity and post-unconformity. Each stage is characterised by different phases of deformation with typical structural style and accompanying mineralisation processes. Four major tectonic events can be recognised here, namely 2500 Ma, 1200 Ma, 700 Ma and 55 Ma. Each event has left its imprint on the rocks as well as uranium mineralisation of Chhinjra area.Keywords
Uranium Mineralisation, Structural Geology, Chhinjra Area, Rampur Window, Himachal Pradesh.
- Angular Unconformity Between Manikaran Quartzite and Chlorite Phyllite, Rampur Window, Kulu District, Himachal Pradesh
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Authors
Affiliations
1 Department of Atomic Energy. West Block VII, R. K. Puram, New Delhi 110 066, IN
1 Department of Atomic Energy. West Block VII, R. K. Puram, New Delhi 110 066, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 34, No 2 (1989), Pagination: 192-197Abstract
An angular unconformity between Manikaran quartzite and overlying chlorite phyllite is observed near Dharmoar, Parvati valley section of the Rampur window. The chlorite phyllites were deposited over the deformed and eroded surface of the quartzites. It is suggested that this unconformity has influenced the control of uranium mineralisation in the rocks of Rampur Group of the area.- A Note on the Uranium Mineralisation along Jamual-markundi Fault, Sonbhadra and Sidhi Districts, Uttar Pradesh and Madhya Pradesh
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, New Delhi-110066, IN
2 Atomic Minerals Directorate for Exploration and Research, Jaipur -302030, IN
3 Atomic Minerals Directorate for Exploration and Research, 313/4, Sector-56, Rail Vihar, Gurgaon, Haryana, IN
1 Atomic Minerals Directorate for Exploration and Research, New Delhi-110066, IN
2 Atomic Minerals Directorate for Exploration and Research, Jaipur -302030, IN
3 Atomic Minerals Directorate for Exploration and Research, 313/4, Sector-56, Rail Vihar, Gurgaon, Haryana, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 71, No 1 (2008), Pagination: 125-128Abstract
Surface indications of uranium mineralisation associated with ferruginised brecciated rocks is traceable, intermittently, over a strike length of 25 km, exposed along the Jamual -Markundi Fault (JMF), at the tectonic contact of Neo- to Meso-Proterozoic Vindhyan Supergroup and Paleo-Proterozoic Mahakoshal Group between Gurdah and Mohariya, Sonbhadra and Sidhi districts of U.P. and M.P. respectively. Preliminary investigations reveal uranium (U3Og) content upto 610 ppm with little or no ThO2. Uranium occurs in adsorbed state in the ferruginised groundmass of brecciated rock and probably related to hydrothermal activity. This is the first reported uranium occurrence from this unconformity related geological set up in the Son valley.Keywords
Uranium mineralisation, Unconformity, Jamual-Markundi fault, Son-valley, U.P., M.P.- Petrography and Geochemistry of Uranium Mineralised Precambrian Granitic-Pegmatitic Rocks of Mawlait, West Khasi Hills District, Meghalaya
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Jamshedpur - 831 002, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Nagpur - 440 001, IN
3 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad - 500 016, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Jamshedpur - 831 002, IN
2 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Nagpur - 440 001, IN
3 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, Hyderabad - 500 016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 5 (2009), Pagination: 639-645Abstract
During radiometric investigation at Mawlait, significant uranium mineralisation (0.024-0.22%U3O8) was located mainly within the small pegmatite (garnet bearing quartzofeldspathic rock), which are locally segregated within migmatite at Umiang River section. Pink granite and granite gneisses are the dominant lithounits of the study area showing fertile character and spotty radioactivity at several places. Radioactivity in these rocks is mainly contributed by discrete uraninite grains along with some zircon and xenotime. Granites are peraluminous, low-Ca in nature and their geochemical signatures suggest derivation from a felsic source. Discriminant diagrams using Rb, Nb and Y indicate 'within plate' to 'volcanic arc' nature of the rock. The uraniferous pegmatitic veins within migmatite appear to have formed due to localised metamorphic segregation during late stage of anatexis. Petromineralogical and geochemical studies suggest that the uranium mineralisation in granitic-pegmatitic rocks of the area is mainly syn-magmatic type.Keywords
Pegmatite Veins, Granites, Uranium Mineralisation, Mawlait, Meghalaya.References
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