Abstract
The paper presents the uranium (U) concentration and distribution pattern in the Paleoproterozoic phosphorites of Lalitpur district of Uttar Pradesh. The study of thin sections, SEM and XRD reveal that apatite is the essential phosphate mineral while quartz and feldspars are the dominant gangue in the phosphorites of the investigated area. The collophane is observed to be mostly oolitic in form and microspherulitic in texture. The major element geochemistry indicated that the phosphorite samples are rich in P2O5, CaO, SiO2 and Fe2O3 whereas depletion of MgO, MnO, K2O and Al2O3 was observed. The CaO/P2O5 ratio ranges from 1.13 to 1.46 which is slightly lower than that of cations and anions substituted francolite (1.621) and close to that of carbonate-fluorapatite (1.318). The trace element geochemistry indicates that the phosphorites of Lalitpur have the significant range of U concentration (1.67 to 129.67 μg/g) which is more than that of Th (0.69 to 0.09 μg/g) among the analysed trace elements in the phosphorite samples of the area. The positive correlation of U with P2O5, CaO and U/P2O5 indicates a close association of U with phosphate minerals like collophane (apatite), whereas negative correlation of U with SiO2 and Fe2O3 may be due to mutual replacement. The antipathetic relationship of U with Ni may be an indication of high oxidizing conditions, whereas sympathetic relationship of U with K2O points towards higher alkaline conditions of the basin of deposition during phosphatization. The variable concentration of U and its relationship with significant major and trace elements in most of the phosphorite samples lead one to believe that the deposition of these phosphorites might have taken place in highly alkaline medium during fairly oxidizing to weakly reducing environmental conditions of geosynclinal basin.
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Acknowledgments
The authors are grateful to the Chairman, Department of Geology, Aligarh Muslim University, for providing facilities to carry out this work. Authors are thankful to the Directors, National Geophysical Research Institute, Hyderabad (NGRI) and National Institute of Oceanography, Goa, for their permission for geochemical analysis, XRD and SEM studies, respectively. We are also thankful to Dr. V.P. Rao, National Institute of Oceanography, Goa, and Dr. Masroor Alam, Department of Civil Engineering, Aligarh Muslim University, Aligarh, for their kind help in SEM, XRD and photomicrographs. First author is thankful to Dr. S. H. Jafri for his help and guidance during chemical analysis at NGRI, Hyderabad. University grants commission (UGC) is thankfully acknowledged for providing financial assistance.
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Dar, S.A., Khan, K.F., Khan, S.A. et al. Uranium (U) concentration and its genetic significance in the phosphorites of the Paleoproterozoic Bijawar Group of the Lalitpur district, Uttar Pradesh, India. Arab J Geosci 7, 2237–2248 (2014). https://doi.org/10.1007/s12517-013-0903-8
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DOI: https://doi.org/10.1007/s12517-013-0903-8