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Ravindra, Rasik
- Geochemistry and Geochronology of A-Type Granite from Northern Humboldt Mountain, East Antarctica: Vestige of Pan-African Event
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Authors
Affiliations
1 Geological Survey of India, Jhalana Institutional Area, Jaipur 302 004, IN
2 Department of Geology, University of Rajasthan, Jaipur 302 004, IN
1 Geological Survey of India, Jhalana Institutional Area, Jaipur 302 004, IN
2 Department of Geology, University of Rajasthan, Jaipur 302 004, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 56, No 3 (2000), Pagination: 253-262Abstract
A-type granite and gabbro-norite-anorthosite (GNA) suite in the Nordvestoya and Hjornehorna Hills of Northern Hurnboldt Mountains, Central Dronning Maud Land, East Antarctica, intrude the multi-deformed basement rocks that show intermediate pressure, granulite facies metamorphism. The granite consists of perthitic K-feldspar, strain free quartz and sodic plagioclase as the main minerals, with minor biotite and hornblende and accessory phases of zircon, apatite and apaques. The granite is metaluminous and shows A-type geochemical signatures - high silica (69.26 to 78.09%), high alkalis, high FeO/MgO ratio and significant HFSE and LREE enrichment with prominent negative Eu anomaly. The granite has yielded whole rock Rb - Sr isochron age of 514±59 Ma with an initial 87Sr/86Sr ratio of 0.7071±0.0013. This age is synchronous with the Pan-African tectono-thermal event, recorded elsewhere in the Eastern Gondwanaland. The A-type granite has resulted from crustal melting initiated by mantle uprise. The ascent and emplacement of granite was facilitated by crustal thinning and fracturing under extensional tectonic regime.Keywords
East Antarctica, Northern Humboldt Mountain, A-Type Granite, Geochemistry, Geochronology.
- International Polar Year: Past, Present and Future
Abstract Views :188 |
PDF Views:138
Authors
Affiliations
1 NCAOR, Vasco-da-Gama, IN
1 NCAOR, Vasco-da-Gama, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 74, No 1 (2009), Pagination: 144-145Abstract
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- IPY Science Conference: Showcasing Polar Research
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PDF Views:126
Authors
Affiliations
1 NCAOR, Goa, IN
1 NCAOR, Goa, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 4 (2010), Pagination: 427-427Abstract
No Abstract.Full Text
- Three Decades of Polar Science in India
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Authors
Affiliations
1 National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-da-Gama, Goa - 403 804, IN
1 National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-da-Gama, Goa - 403 804, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 1 (2011), Pagination: 5-6Abstract
No Abstract.- Ionic Characters of Lake Water of Bharti Promontory, Larsemann Hills, East Antarctica
Abstract Views :224 |
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Authors
Affiliations
1 Geological Survey of India, Faridabad - 121 001, IN
2 National Centre for Antarctic and Ocean Research, Vasco-Da-Gama, Goa - 403 804, IN
1 Geological Survey of India, Faridabad - 121 001, IN
2 National Centre for Antarctic and Ocean Research, Vasco-Da-Gama, Goa - 403 804, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 78, No 3 (2011), Pagination: 217-225Abstract
The Larsemann Hills area represents a unique environmental setting between marine and glacial ecosystems. One of the promontories of this region, named Bharti, depicting similar set up was selected for the study of chemical parameters with special reference to its ionic characters. Water samples from 6 selected lakes of Bharti promontory, Larsemann Hills area were collected during the austral summer of 2004-05 and analysed for major ionic concentration and Total Dissolved Solid (TDS). This study is aimed at understanding the water chemistry of lakes of this island with emphasis on correlation between different ionic concentrations, TDS and its possible causes. The study will provide baseline data that will be useful for planning further studies. Analytical result shows that the water chemistry of these lakes is mainly governed by the lithology, precipitation, drainage and marine environment. Minor contribution of evaporation, has also been observed on the chemistry of one of the lake water. The main source of water for these lakes comes mainly from snow precipitation and its melting. The drainage line mostly goes towards eastern direction for these lakes.Keywords
Ionic Characters, Water Chemistry, Precipitation, Larsemann Hills, Bharti Promontory.References
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