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

Navin Goyal ¹, Siby K. Varughese ¹, P. K. Hansda ¹, S. Ramachandran ¹, Rajendra Singh ²

Affiliations
1 Atomic Minerals Division, Baroda - 390 001, IN
2 Atomic Minerals Division, Hyderabad - 500 016, IN

Abstract

The Precambrian Champaner Group of rocks are intruded by Godhra granites in Jambughoda area. Significant uranium mineralisation has been located in the fractures in the dolomitic limestone of Lower Champaners with uraninite occurring as the primary uranium mineral. The geochemical features observed for the granites suggest that the granite melt, originated by the partial melting of relatively silicic crust, was further modified by fractionation processes during which uranium was concentrated in the late magmatic and subsequent hydrothermal fluids. The Champaner deformation resulted in the formation of WNW-ESE regional fracture system and crush zones, thus making the rocks highly penneable for the passage of uranium-rich hydrothermal fluids and offering open spaces for precipitation of uranium under suitable physicochemical conditions.

Keywords

Geochemistry, Champaners, Granites, Uranium, Gujarat.

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P. B. Maithani ¹, Y. V. Rathaiah ¹, Siby K. Varughese ¹, Rajendra Singh ²

Affiliations
1 Atomic Minerals Division, Department of Atomic Energy, Baroda-390 001, IN
2 Hyderabad-500016, IN

Abstract

The granites around Zoz represent a differentiated, calc-alkaline, subaluminous, A-type granite with higher uranium content. The A-type affinity points to the possibility of encountering Sn, Mo, Bi, Nb, Ta and F mineralisation in the area. The low Th/U ratio also favours vein type U-deposits within granites or in adjacent metasediments.

Keywords

Geochemistry, Godhra Granite, Zoz, Champaner, Gujarat.

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