Abstract
Uranium mineralization in Jahaz prospect of North Delhi Fold Belt, Rajasthan is closely associated with deformed and metasomatized meta-sediments of Ajabgarh Group. Detailed petrographic and electron microprobe studies of bore-hole samples indicate that the host rocks consist of metamorphic mineral assemblage such as quartz-annite-muscovite-hornblende (magnesiohornblende - ferrohornblende) - anorthite—bytownite with almandine - staurolite-corundum- ilmenite. Brittle-ductile deformation is evident by brecciation, micro-folds and fracture filled micro-veinlets of quartz and calcite. Fluid induced alteration products are pennine-albite-phlogopite-orthoclase-sphene-rutile-actinolite-ferropargasite-sericite-calcite-apatite. Two types of albite are prominent, albite-1 formed by alteration of parent metamorphic plagioclase, whereas albite-2 is feathery and found to be in open spaces and formed by precipitation of sodium rich fluid. Sulfide minerals (pyrrhotite-chalcopyrite) are most common in albitized rocks and commonly associated with calcite. The above studies clearly indicate the geological processes responsible for the formation of metamorphic-metasomatic mineral assemblages in host rocks associated with uranium mineralization.
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Acknowledgements
The authors acknowledge the authorities of Atomic Minerals Directorate (AMD) for allowing us to carry out field work and collect samples from the study area as well as adjoining areas. We thank the Department of Earth Sciences, IIT Roorkee for providing all the facilities to do this work. Board of Research in Nuclear Sciences (BRNS) of Department of Atomic Energy, Government of India, Mumbai funded this project to Prof. Krishnamurthi. We acknowledge Mrs. Sreejita Chatterjee for the help during field work and Dr. N.V. Chalapathi Rao of Banaras Hindu Universy, Varanasi for EPMA analyses on payment basis. We sincerely thank Mr. Ravi Saini of IIC, IIT Roorkee for EPMA analyses and Dr. Narendra Patel, Research Associate, Earth Sciences Department of IIT Roorkee for hel** us to prepare the geological map of Jahaz. Special thanks to lab colleagues Ms. Manju Sati, Mr. Solomon Rebso Abebe, Mr. Kamlesh Kumar Meena, Mrs. Debalin Rout and Ms. Amanpreet Kaur for their immense support.
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Mishra, P., Krishnamurthi, R., Bisht, B.S. et al. Mineralogical Studies of Metasomatized Host Rocks of Jahaz Uranium Prospect, North Delhi Fold Belt, Rajasthan. J Geol Soc India 98, 1068–1073 (2022). https://doi.org/10.1007/s12594-022-2125-8
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DOI: https://doi.org/10.1007/s12594-022-2125-8