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Chalapathi Rao, N. V.
- Science of the Earth System
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Affiliations
1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi - 221 005, IN
1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi - 221 005, IN
Source
Current Science, Vol 116, No 12 (2019), Pagination: 1942-1943Abstract
No Abstract.Keywords
No Keywords.Full Text
- Boron Measurement in Tourmaline from Pegmatite Veins, Simdega Area, Chhotanagpur Gneissic Complex, Eastern India using Electron Probe Microanalysis
Abstract Views :232 |
PDF Views:73
Authors
Affiliations
1 Mantle Petrology Laboratory, Department of Geology, Centre of Advanced Study, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
1 Mantle Petrology Laboratory, Department of Geology, Centre of Advanced Study, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
Source
Current Science, Vol 117, No 5 (2019), Pagination: 858-865Abstract
Tourmaline group of minerals, the primary source of boron, are cyclosilicates which are widespread in the earth’s crust. Earlier studies involving the nomenclature and classification of tourmaline were based on the measurement of its common elements (Al, Mn, Fe, Mg, etc.). In all such studies, boron was assumed to be fixed in the composition and restricted only to the triangular structural site. However, recent discovery of the presence of boron in the tetrahedral structural site as well, necessitates the measurement of boron content. Much of the earlier attempts to measure boron were based on solution methods, and electron microprobe analysis (EPMA) was the least used due to low levels of detection of its analytical crystals. In the present study, we quantify boron – particularly along with fluorine and other major elements – in tourmaline grains using high-sensitivity PC3 analytical crystal. We found that the measured boron content slightly exceeds that of the stoichiometrically calculated boron. Also, the studied tourmalines come under the alkali group in general and belong to the schorl– dravite solid solution series in particular.Keywords
Boron, Electron Probe Micro Analysis, Pegmatite, Tourmaline.Full Text
References
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- Singh, U. P., Venkatesh, N. S., Godhavari, K. S., Gopalkrishnan, R., Fareeduddin and Rao, M. S., Lamprophyre dykes in Chotanagpur gneissic complex, near Simdega, Gumla district, Jharkhand. J. Geol. Soc. India, 2004, 63, 655–658.
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- Volcanic and Igneous Plumbing Systems:Understanding Magma Transport, Storage, and Evolution in the Earth’s Crust
Abstract Views :317 |
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Authors
Affiliations
1 Mantle Petrology Laboratory, Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
1 Mantle Petrology Laboratory, Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
Source
Current Science, Vol 117, No 12 (2019), Pagination: 2060-2062Abstract
Volcanoes are some of the most fascinating features not only on the earth but also on some of its counterparts in our own solar system. For example, Olympus Mons on the Mars is the tallest yet known volcano in our solar system with a height almost three times that of the Mount Everest. Volcanoes are regarded to be the cradle for the development and evolution of life on the earth as well as edifices which have brought countless species (including giant dinosaurs) close to and/or complete extinction.Full Text
- The Department of Geology, Institute of Science, Banaras Hindu University, Varanasi:A Success Story of 100 Years
Abstract Views :257 |
PDF Views:84
Authors
Affiliations
1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
Source
Current Science, Vol 118, No 2 (2020), Pagination: 186-188Abstract
Completion of one hundred years of existence is a monumental occasion on every front. If an academic institution of eminence crosses this milestone it becomes imperative not only to celebrate this historic event, but also necessitate us to pause and ruminate with pride its long and illustrious journey through the past century. The Department of Geology of the Institute of Science, Banaras Hindu University (BHU), Varanasi, established in 1919, has completed its centennial year in October of 2019 and joins the proud list of such century old prestigious academic institutions of our country like Presidency University, Kolkata and Presidency College, Chennai, where such departments were started as early as in 1892 and 1910 respectively. It is a coincidence that two renowned earth science unions, viz. the International Union of Geodesy and Geophysics (IUGG) and the American Geophysical Union (AGU) have completed 100 years of their glorious services in 2019. This write-up briefly outlines the evolutionary history of the Department of Geology, BHU, its phenomenal role as a progenitor and mentor to several other distinguished earth science departments across the country, present status, and also its roadmap for the future.Full Text
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- Mesoproterozoic 40Ar/39Ar Age and Sr–Nd Isotopic Geochemistry of Calc-alkaline Lamprophyre fromthe Mudigubba Area, Eastern Dharwar Craton, India
Abstract Views :207 |
PDF Views:89
Authors
Affiliations
1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
2 Centre for Earth Sciences, Indian Institute of Science, Bengaluru 560 012, IN
1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
2 Centre for Earth Sciences, Indian Institute of Science, Bengaluru 560 012, IN
Source
Current Science, Vol 119, No 7 (2020), Pagination: 1142-1148Abstract
We report a 40Ar/39Ar Mesoproterozoic radiometric age for a calc-alkaline lamprophyre dyke from the Mudigubba area towards the western margin of the Cuddapah Basin, Eastern Dharwar Craton (EDC), Southern India. Amphibole phenocryst separates from this lamprophyre yielded a plateau age of 1169 ± 8 Ma (2σ ), which is almost 50 million years older than the majority of radiometric dates available for the Wajrakarur field kimberlites which are proximal to this dyke. Bulk-rock Sr–Nd isotopic analyses of the Mudigubba lamprophyre dykes (εNd(t) between –13.3 and –12.4) reveal their derivation from an old, enriched, continental lithospheric mantle unlike the kimberlites (bulk-rock and perovskite in situ εNd(t)) between –0.77 and +7.93), which originated either from a chondritic or depleted mantle source. This study provides further evidence for emplacement of compositionally distinct, mantle-derived Mesoproterozoic alkaline magmas in the EDC and highlights the extremely heterogeneous character of the lithospheric mantle beneath this craton.Keywords
Alkaline Magma, Lamprophyre Dyke, Lithospheric Mantle, Kimberlites, Radiometric Age.Full Text
References
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- Vanadium-Bearing Titaniferous-Magnetite Mineralization from the Simdega Area, Chhotanagpur Gneissic Complex, Eastern India
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Authors
Affiliations
1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, IN
Source
Current Science, Vol 120, No 5 (2021), Pagination: 759-763Abstract
No Abstract.Full Text
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