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Research Paper | Genetics Science | India | Volume 8 Issue 8, August 2019
Mineral Explorations of Cu-Pb-Zn deposits of Sikar District, Rajasthan, India
Abstract: The Geophysical methods are one of the indirect techniques to understand the subsurface geology and its associated features. In geophysical exploration, measurements will be taken on the earth’s surface/ boreholes to determine distributions of physical properties at depths that reflect subsurface geology. Magnesium-bearing calcretes of soft-gritty and hard pan varieties containing uranium concentrations from 16 to 74 ppm with <10 ppm of thorium are located along the palaeochannel at Narsingpuri to Gumansingke Dani village, Sikar district, Rajasthan. The uranium- bearing calcretes are exposed over an area extent of 300m and 200 m with thickness of up to 2 m in an inter- dunal depression. The silty sand layer occurring below the calcrete horizon suggests that it is a valley-fill cal- Crete, deposited along a palaeochannel. This occur- rence of uraniferous Mg-calcrete in the Palaeochannel opens up a large area for ura- nium exploration in the calcrete environment of Thar Desert. These calcretes are composed of 15.94 % to 25.39 % CaO, 7.15 % to 22.39 % MgO and Sr/Ba ratio up to 66.98. There is a positive correlation of U with Sr/Ba and MgO. The high Sr/Ba ratio and MgO indi- cate water of saline nature and high rate of evapora- tion. Ephemeral centripetal drainage mixing with the dissected palaeochannel waters and groundwater’s, under arid climatic conditions might have resulted in the formation of this kind of uranium-bearing calcrete in fluvio-lacustrine environment.
Keywords: Fluvio-lacustrine environment, Sikar, magnesium calcrete, surgical type uranium
Edition: Volume 8 Issue 8, August 2019,
Pages: 1963 - 1966