N. Goyal et al., GEOCHEMISTRY OF GRANITES OF JAMBUGHODA, PANCHMAHALS DISTRICT, GUJARATAND URANIUM MINERALIZATION IN CHAMPANER GROUP, Journal of the Geological Society of India, 50(6), 1997, pp. 769-778
The Precambrian Champaner Group of rocks are intruded by Godhra granit
es in Jambughoda area. Significant uranium mineralisation has been loc
ated in the fractures in the dolomitic limestone of Lower Champaners w
ith uraninite occurring as the primary uranium mineral. The geochemica
l features observed for the granites suggest that the granite melt, or
iginated by the partial melting of relatively silicic crust, was furth
er modified by fractionation processes during which uranium was concen
trated in the late magmatic and subsequent hydrothermal fluids. The Ch
ampaner deformation resulted in the formation of WNW-ESE regional frac
ture system and crush zones, thus making the rocks highly permeable fo
r the passage of uranium-rich hydrothermal fluids and offering open sp
aces for precipitation of uranium under suitable physicochemical condi
tions.