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Chakraborty, Sujit
- Our Heritage:Our Responsibility
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1 Zoological Survey of India, Kolkata, IN
1 Zoological Survey of India, Kolkata, IN
Source
Journal of Environment and Sociobiology, Vol 11, No 1 (2014), Pagination: 89-93Abstract
Richness, uniqueness, significance and importance of natural and cultural heritage of India have been discussed. National and international measures taken for conservation of the same are stated. Degradation of our heritage is going unabated. Examples of successful conservation programmes through peoples' participation are cited. Responsibilities of the present generation to ensure safe transfer of heritage to the future generations for their well-being are focused.Keywords
Heritage, World Heritage Sites, Conservation, Convention, Community Movement.- Petrogenesis of Archaean Chromite Deposits of the Roro-Jojohatu Areas in the Singhbhum Craton: A Boninitic Parental Melt in Supra-Subduction Zone Setting
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Authors
Affiliations
1 Petrology Division, ER, Geological Survey of India, Kolkata, IN
2 Project: Andaman and Nicobar, Op: WSA, ER, Geological Survey of India, Kolkata, IN
3 Monitoring Division, CHQ, Geological Survey of India, Kolkata, IN
1 Petrology Division, ER, Geological Survey of India, Kolkata, IN
2 Project: Andaman and Nicobar, Op: WSA, ER, Geological Survey of India, Kolkata, IN
3 Monitoring Division, CHQ, Geological Survey of India, Kolkata, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 72, No Spl Iss 5 (2008), Pagination: 635-647Abstract
The chromite bearing ultramafic rocks of Roro-Jojohatu areas in the Singhbhum Craton within the metasediments of the Iron Ore Group (IOG) is a part of Archaean greenstone terrain of Eastern India. In this area since all the primary silicates are altered, chromite has been used for host rock petrogenesis. Chromite occurs in different forms viz. (a) mainly cumulus phases in chromitite layers, (b) intercumulus phases forming banded/net textured chromite and (c) fine disseminations. Chemically all the chromites are aluminian chromite. The massive chromite and banded/net-textured chromites show high Cr-number (79-83) and intermediate Mg-number (51-60), but disseminated chromites have consistently low Cr-number (76-79) and low Mg-number (43-52). The plots of TiO2 versus Cr-number, Al2O3 versus TiO2, and Mg-number versus Cr-number reflect boninitic parental melt for the chromites. Al2O3 contents in liquid ranging from 9.67-11.03wt% and TiO2 contents in liquid 0.42-0.75wt% also correspond for boninitic parentage. The FeO/MgO ratio in liquid ranging from 1.15 to 1.29 for massive chromites and 0.86-1.23 for banded/net-textured chromite, also suggest for boninitic source. Al2O3 versus TiO2 plots indicate that chromites plot in the field of supra-subduction zone peridotites. Boninitic magma was produced from hydrous mantle melting in supra-subduction zone. At supra-subduction setting an oxidizing hydrous fluid derived from subducting slab facilitated the formation of chromitite layers at high fO2 conditions.Keywords
Chromites, Boninite, Supra-Subduction Zone, Roro-Jojohatu, Singhbhum Craton.- Sixteenth International Cancer Congress
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1 Surgeon and Oncologist, Head, Department of Radiotherapy, Chittaranjan National Cancer Institute, Calcutta, IN
1 Surgeon and Oncologist, Head, Department of Radiotherapy, Chittaranjan National Cancer Institute, Calcutta, IN