Geological and geochemical attributes of geratiyon Ki Dhani-Ladi ka bas area, Sikar district, Rajasthan: ITS implications on Uranium mineralisation Mathew Shijo1,*, Jain A.K.1, Kumar Kamlesh1, Mishra Brundaban1, Khandelwal M.K.1, Verma M.B.2, Nanda L.K.2 1Atomic Minerals Directorate for Exploration & Research, Jaipur, India 2Atomic Minerals Directorate for Exploration & Research, Hyderabad *E-mail: shijomathew.amd@gov.in
Online published on 13 February, 2019. Abstract Khetri Sub-basin of North Delhi Fold Belt is characterized by the presence of several uranium occurrences associated with albitite zones. Geratiyon Ki Dhani - Ladi Ka Bas area is located along the eastern albitite zone in Sikar District, Rajasthan and exposes quartzite, quartz-biotite schist and calc-silicate of Ajabgarh Group. Granites exposed near Jaitpura and Ladi Ka Bas area occur as an intrusive within the metasediments. Geochemical studies of metasediments has revealed predominance of Na2O over K2O indicating albitisation. In this area, several uranium occurrences hosted by albitised quartzite, quartz-biotite schist and calc-silicate rocks are associated with NE-SW, NNW-SSE, N-S trending albitised fracture/shear zones. Uranium minerals identified from Geratiyon Ki Dhani - Ladi Ka Bas areas are mainly uraninite, brannerite and uranophane. In Kalatopri area, besides uraniferous zones uranium-thorium mixed values are also observed. A new uranium anomaly hosted by sheared granite along the contact of quartz biotite schist is present to the east of Ladi Ka Bas intermittently over a strike length of 1.2 km and located along the axial region of a southerly plunging antiform. Radiometric assay has revealed 0.011% to 0.80% U3O8 (â/ã) with negligible ThO2. The Geratiyon Ki Dhani- Ladi Ka Bas area with a favourable geological and structural setting associated with albitisation is a promising target for uranium exploration. Top Keywords Khetri Sub-basin, Albitisation, Geratiyon Ki Dhani, Ladi Ka Bas East. Top |