Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

G. S. Sharma ¹, R. K. Purohit ¹, Minati Roy ¹, B. Sengupta ¹, Jagmer Singh ²

Affiliations
1 Atomic Minerals Division, Department of Atomic Energy, New Delhi-110066, IN
2 Atomic Minerals Division, Department of Atomic Energy, Hyderabad-500016, IN

Abstract

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.

Full Text

     

A. V. Subrahmanyam ¹, Jagmer Singh ²

Affiliations
1 RCER, AMD, (P.O), Assam Rifles, Shillong - 793011, IN
2 1-10-153/156, AMD, Begumpet, Hyderabad - 500 016, IN

Abstract

The geochemistry reveals LREE enrichment, high degree of fractionation, positive Ce anomalies and negative Eu anomalies in the samples. Red mud contains 18 to 29% of heavy minerals; and thus the red mud could be an alternative source to beach sands.

Keywords

Economic Geology, REE, Bauxite, Heavy Minerals, Orissa.

Full Text

     

Mithilesh Sharma ¹, T. P. S. Rawat ¹, Y. C. Sharma ², B. M. Swarnkar ¹, Jagmer Singh ³

Affiliations
1 Department of Atomic Energy, AMD, New Delhi - 110 066, IN
2 40312, Chand Nagar, New Delhi - 1 10 018, IN
3 407, Pacific Apartment, X/39, Dwarka, New Delhi - 110 045, IN

Abstract

Ground radiometric survey carried out in the early Tertiary Dagshai-Kasauli Formations in the northwestern foothill Himalaya has led to the discovery of uranium mineralised sandstone bands extending for about (a) 500 m, with 5-10 m width, at Tarol, 8 km southwest of Solan and (b) 250 m, with 4-7 m width, at Maltu, 6.5 km southwest of Solan, in the Solan district of Himachal Pradesh. Grab samples from (a) Tarol assayed up to 1.41% eU₃O₈, 1.65% U₃O₈ (β/γ) and <0.005% Tho₂ and (b) Maltu assayed up to 0.24% eU₃O₈, 0.28% U₃O₈ (β/γ) and 2. In both the localities, majority of the samples show disequilibrium in favour of parent (uranium). Uraninite and uranophane are the main uranium minerals, which occur in close association with disseminated pellets of organic matter.

Keywords

Economic Geology, U-Mineralisation, Sandstone Type, Tertiary, Dharamsala, Solan, Himachal Pradesh.

Full Text