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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
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 68, No 1 (2006), Pagination: 87-94
Abstract
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.
