caa a22 4500 605538832 CHVBK 20210128100904.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s11053-014-9260-x doi (NATIONALLICENCE)springer-10.1007/s11053-014-9260-x Petro-mineralogical Studies of the Paleoproterozoic Phosphorites in the Sonrai basin, Lalitpur District, Uttar Pradesh, India [Elektronische Daten] [Shamim Dar, K. Khan, Saif Khan, Samsuddin Khan, M. Masroor Alam] The Paleoproterozoic phosphorites constitute an economically significant component of the Sonrai basin of Lalitpur district. These are associated with ferruginous shale, ironstone, limestone and quartz breccia. Petro-mineralogical studies of samples of the phosphorites, using X-ray diffractometry and scanning electron microscopy, reveal that the collophane (carbonate-fluorapatite) is the dominant phosphate mineral. Calcite, dolomite, quartz, mica and haematite are the dominant gangue constituents. The phosphate minerals occur as oolites mutually replaced by carbonate and silica. The presence of iron oxides has been found in most of the thin sections. There is meagre evidence of organic matter in the form of filaments of microbial phosphate laminae in the samples of phosphorite. The mineral assemblages, their texture and various forms in these phosphorites may be due to some environmental vicissitudes followed by replacement processes and biogenic activities. International Association for Mathematical Geosciences, 2014 Petro-mineralogy nationallicence Paleoproterozoic nationallicence Sonrai basin nationallicence Phosphorite nationallicence Carbonate-fluorapatite nationallicence Dar Shamim Department of Geology, Aligarh Muslim University, 202002, Aligarh, Uttar Pradesh, India aut Khan K. Department of Geology, Aligarh Muslim University, 202002, Aligarh, Uttar Pradesh, India aut Khan Saif Department of Geology, Aligarh Muslim University, 202002, Aligarh, Uttar Pradesh, India aut Khan Samsuddin Department of Geology, Aligarh Muslim University, 202002, Aligarh, Uttar Pradesh, India aut Masroor Alam M. Geology Section Department of Civil Engineering, Aligarh Muslim University, 202002, Aligarh, Uttar Pradesh, India aut Natural Resources Research Springer US; http://www.springer-ny.com 24/3(2015-09-01), 339-348 1520-7439 24:3<339 2015 24 11053 https://doi.org/10.1007/s11053-014-9260-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11053-014-9260-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dar Shamim Department of Geology, Aligarh Muslim University, 202002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 700 1- Khan K. Department of Geology, Aligarh Muslim University, 202002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 700 1- Khan Saif Department of Geology, Aligarh Muslim University, 202002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 700 1- Khan Samsuddin Department of Geology, Aligarh Muslim University, 202002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 700 1- Masroor Alam M. Geology Section Department of Civil Engineering, Aligarh Muslim University, 202002, Aligarh, Uttar Pradesh, India aut NATIONALLICENCE 773 0- Natural Resources Research Springer US; http://www.springer-ny.com 24/3(2015-09-01), 339-348 1520-7439 24:3<339 2015 24 11053