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Prakash Narasimha, K. N.
- Vermiculite in the Gopalpura Area, Karnataka - A Mineralogical Study
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Authors
Affiliations
1 Department of Geology, University of Mysore, Mysore - 570 006, IN
2 M P D, N G R I, Hyderabad-500 007, IN
3 Center for Neo-Ecofriendly Studies and Training, Mysore, IN
1 Department of Geology, University of Mysore, Mysore - 570 006, IN
2 M P D, N G R I, Hyderabad-500 007, IN
3 Center for Neo-Ecofriendly Studies and Training, Mysore, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 67, No 2 (2006), Pagination: 159-163Abstract
Vermiculite mineralization in the Gopalpura area, Karnataka in the Archean supracrustal rocks of the Sargur Group occurs as discontinuous lenses and pockets within the ultramafic rock and at the contact with acid intrusives. Detailed mineralogy as studied using microscopy, X-Ray diffraction, infrared spectroscopy, differential thermal analyses, and electron microprobe analyses are presented. The probable origin of the vermiculite from biotite through hydrobiotite is discussed.Keywords
Vermiculite, Sargurs, Gopalpura, Mysore District, Karnataka.- UNESCO Regional Training Programme on Recent Advances in Earth Observation for Geo-Resources Management
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PDF Views:139
Authors
Affiliations
1 Dept.of Geology University of Mysore Manasagangotri Mysore - 570 006, IN
1 Dept.of Geology University of Mysore Manasagangotri Mysore - 570 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 63, No 2 (2004), Pagination: 233-234Abstract
No Abstract.- Petrography and Fluid Inclusion Studies on Late Proterozoic Palnad Siliciclastics, Kurnool Group, Andhra Pradesh
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Authors
Affiliations
1 Department of Studies in Geology, Manasagangotri, University of Mysore, Mysore - 570006, IN
1 Department of Studies in Geology, Manasagangotri, University of Mysore, Mysore - 570006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 61, No 5 (2003), Pagination: 612-618Abstract
Petrographic studies of Palnad siliciclastics reveal medium to fine grained, sub rounded to rounded detrital quartz grains cemented by silica mostly as authigenic overgrowth. Fluid inclusions trapped in the quartzites of Kurnool Group (Palnad Basin) are of aqueous saline type. The melting temperature indicates salinity values of 5-17.2 wt % NaCl equivalent and the density of these saline fluids vary from 0.889-0.952 gcm3. The entrapment of fluids in quartz grains took place between the temperature range of 76.5° to 202°C. Petrography and microthermometric data of these quartzites points to granites and granitic gneisses as the source rocks. The presence of secondary inclusions indicates probable tectonic activity during the deposition of the sediments in the study area.- Chemical Character of Detrital Garnet in Cauvery River Sediment and its Provenance, South India
Abstract Views :619 |
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Authors
Affiliations
1 Department of Geology, Anna University, Chennai-600025, Tamil Nadu, IN
2 Department of Studies in Earth Sciences, University of Mysore, Mysore-570006, Karnataka, IN
1 Department of Geology, Anna University, Chennai-600025, Tamil Nadu, IN
2 Department of Studies in Earth Sciences, University of Mysore, Mysore-570006, Karnataka, IN
Source
International Journal of Earth Sciences and Engineering, Vol 10, No 4 (2017), Pagination: 752-756Abstract
The study attempts to determine the chemical characters of detrital garnets provenance in the Cauvery River Basin. The geochemical results reveal that the detrital garnets are derived from biotite schist, charnockite, and gneisses of intermediate felsic, moderate to strong weathered provenance. The end member composition of the garnets indicates almandine species that are metamorphosed in amphibolite to granulite facies P-T conditions. The angular outline of detrital garnet in the upstream and sub-rounded to rounded grains in the downstream attribute it’s transport from the upstream of the Cauvery River.Keywords
Detrital Garnet, Mineral Chemistry, Provenance, Cauvery River.References
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- Mafic Rock Hosted Vermiculite Occurrence From Ajjampalli Area, Kolar Schist Belt, Eastern Dharwar Craton, South India
Abstract Views :150 |
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Authors
Affiliations
1 Department of Studies in Earth Science, University of Mysore, Manasagangotri, Mysore-570006, IN
2 Department of Studies in Geology, Karnatak Science College, Dharwad, Karnataka, IN
1 Department of Studies in Earth Science, University of Mysore, Manasagangotri, Mysore-570006, IN
2 Department of Studies in Geology, Karnatak Science College, Dharwad, Karnataka, IN
Source
International Journal of Earth Sciences and Engineering, Vol 9, No 1 (2016), Pagination: 150-156Abstract
The vermiculite in its macroscopic form occurs associated with the mafic rocks in the vicinity of the acidic intrusions around Ajjampalli area in the Kolar schist belt in south India. Mafic rocks form part of the ancient supracrustals and belong to Sakarsanahalli association in the Kolar schist belt of Eastern Dharwar craton. The study area is covered in the Survey of India toposheet 57L/1 and lies between the 12058’ latitude and 78014’ longitude. The present study forms the first detailed investigation of the occurrence of the macroscopic vermiculites in the Ajjampalli area in Kolar schist belt. The study involves field and Petrographic features linked with the mineral chemistry aspects to understand the genesis of vermiculites. XRD, TGA and FTIR techniques have been used to characterize the vermiculites of the study area. The formation of vermiculite in the study area is attributed to the hypogene process followed by epigene process through an intermediate stage of hydrobiotite.Keywords
Vermiculites, Kolar Schist Belt, Eastern Dharwar Craton, Hydrobiotite.- Geochemistry of Lower Jurassic Sandstones of Shemshak Formation, Kerman Basin, Central Iran: Provenance, Source Weathering and Tectonic Setting
Abstract Views :170 |
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Authors
Affiliations
1 Department of Studies in Earth Science, University of Mysore, Manasagangotri, Mysore - 570 006, IN
2 Department of Earth Science and Resource Management, Yuvaraja's College, University of Mysore, Mysore - 570 005, IN
1 Department of Studies in Earth Science, University of Mysore, Manasagangotri, Mysore - 570 006, IN
2 Department of Earth Science and Resource Management, Yuvaraja's College, University of Mysore, Mysore - 570 005, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 5 (2012), Pagination: 483-496Abstract
Lower Jurassic sandstones of Shemshak Formation of Kerman basin, central Iran were analyzed for major and select trace elements to infer their provenance, palaeoweathering of source rocks and tectonic setting. Average modal framework components (Qt: F: L = 67.25: 2.41: 30.48) and chemical composition of the sandstones classify them as litharenites. The sandstones are quartz-rich (∼67% quartz; 75.34 wt.% SiO2) and derived from a recycled orogen composed of quartzose sedimentary rocks. Average CIA, PIA and CIW values (69%, 76% and 80%, respectively) indicate moderate to intense chemical weathering of the source material. The inferred index of weathering/alteration is the sum total of intensities of weathering witnessed by the lithocomponents during atleast two cycles of sedimentation involving (1) chemical weathering of the source rocks («ultimate» granodiorite source and «proximal» quartzose sedimentary source), (2) chemical weathering during fluvial transport of the detritus, (3) chemical weathering of the detritus in depocenters, and (4) chemical weathering during diagenesis. Sandstones exhibit moderate maturity and were deposited under humid climatic conditions. Plots of the chemical analyses data on tectonic setting discrimination diagrams indicate active continental margin setting, which is in agreement with the tectonic evolutionary history of the Central Iran during Jurassic period.Keywords
Sandstones, Lower Jurassic, Provenance, Palaeoweathering, Tectonic Setting, Shemshak Formation, Kerman Basin, Central Iran.References
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