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Fahmi, Sohail
- Evidences for Soda Metasomatism in Ladera-Sakhun Area, Northeastern Rajasthan
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Authors
Affiliations
1 Department of Atomic Energy, C-31, Devnagar, Tonk Road, Jaipur-302018, IN
2 Department of Atomic Energy, AMD Complex, Begumpet, Hyderabad-560016, IN
1 Department of Atomic Energy, C-31, Devnagar, Tonk Road, Jaipur-302018, IN
2 Department of Atomic Energy, AMD Complex, Begumpet, Hyderabad-560016, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 5 (2000), Pagination: 573-582Abstract
Albitite and albitised banded gneissic country rock from the Ladera-Sakhun area, situated about 80km southwest of Jaipur, show several evidences for soda metasomatism. Megascopic evidences include reddening of outcrops due to aventurisation, gradational contacts between albitite and gneisses, development of metasomatic minerals, dequartzification, epidotization and cataclasitisation. Microscopic evidences include relict microcline in the newly formed albite grain, poor and discontinuous development of twin lamellae in albite giving step-like appearance, ubiquitous sweeping extinction in albite due to cataclasitisation, occasional mortar texture in albitite, tapering of twin lamellae within the grain, twin lamellae forming in chequered fashion, development of aventurine albite containing dusty Fe-oxide inclusions, development of albite along twin/cfeavage plane of microcline, formation of new albite in plagioclase, destruction of sericite in plagioclase of albitised granite, formation of myrmekite of intergranular, intragranular and rim types, development of epidote corona around clinopyroxene in pyroxenite, partial to complete dequartzification and filling up of voids by calcite. Petrochemical evidences of increased characteristic values of Na2O from 3.17 to 7.00 wt%, K2O and Si2O from -0.03 to -6.00 wt% and -0.76 to -10.55 wt% in the unalbitised to albitised rocks respectively, provide further support for soda metasomatism. Albitisation at Ladera-Sakhun area extends over a considerable distance into Haryana in the NE and beyond Tal in the SW, attesting to its regional significance and its potential for mineralisation.Keywords
Petrology, Metasomatism, Albitite, Ladera-Sakhun, Rajasthan.- Discovery of the Uraniferous Polymetallic Veins in the Gneisses of Chhota-Udaipur, Ajmer District, Ra Jasthan
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 521207 Pratap Nagar, Tonk Road, Sanganer-Jaipur -303 609, IN
1 Atomic Minerals Directorate for Exploration and Research, Department of Atomic Energy, 521207 Pratap Nagar, Tonk Road, Sanganer-Jaipur -303 609, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 5 (2002), Pagination: 469-472Abstract
Uraniferous polymetallic veins are found in the Gyangarh Asind acidic igneous suite and Sandmata Complex near Chhota-Udaipur in Rajasthan. These veins occur in continuation of the well-known U-Co-Mo mineralised albitite zone in Rajasthan and represent a potential target.- Nature of Uranium Mineralisation in the Kerpura - Tiwari-Ka-Bas Area, Sikar District, Rajasthan
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Authors
Affiliations
1 Atomic Minerals Directorate for Exploration and Research, Western Region, AMD Complex, Sector V Extn., Pratap Nagar, Sanganer, Jaipur - 302 030, IN
1 Atomic Minerals Directorate for Exploration and Research, Western Region, AMD Complex, Sector V Extn., Pratap Nagar, Sanganer, Jaipur - 302 030, IN