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Title: Petro-mineralogical Studies of the Paleoproterozoic Phosphorites in the Sonrai basin, Lalitpur District, Uttar Pradesh, India

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.
Authors:
; ; ;  [1] ;  [2]
  1. Aligarh Muslim University, Department of Geology (India)
  2. Aligarh Muslim University, Geology Section Department of Civil Engineering (India)
Publication Date:
OSTI Identifier:
22469809
Resource Type:
Journal Article
Resource Relation:
Journal Name: Natural Resources Research (New York, N.Y.); Journal Volume: 24; Journal Issue: 3; Other Information: Copyright (c) 2015 International Association for Mathematical Geosciences; http://www.springer-ny.com; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; APATITES; CALCITE; CARBONATES; DOLOMITE; INDIA; IRON OXIDES; LIMESTONE; MICA; ORGANIC MATTER; PHOSPHATES; PHOSPHORITES; QUARTZ; SCANNING ELECTRON MICROSCOPY; SHALES; SILICA; TEXTURE; X-RAY DIFFRACTION