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Rai, S. K.
- Natural Resource Conservation through Weather-Based Agro-Advisory
Abstract Views :215 |
PDF Views:78
Authors
Affiliations
1 Indian Grassland and Fodder Research Institute, Gwalior Road, Jhansi 284 003, IN
1 Indian Grassland and Fodder Research Institute, Gwalior Road, Jhansi 284 003, IN
Source
Current Science, Vol 111, No 2 (2016), Pagination: 256-258Abstract
Natural Resources (NR) are not only important in enhancing and sustaining economic growth, but are also key in reducing poverty through providing employment, livelihood and food security. However, these resources have been largely overexploited in an unsustainable manner for human welfare. Climate change-related events have further threatened our NR. The extreme weather events may be related to climate change and are expected to further accelerate in the coming years.Full Text
- In situ U-Pb Zircon Micro-Geochronology of MCT Zone Rocks in the Lesser Himalaya Using LA–MC–ICPMS Technique
Abstract Views :223 |
PDF Views:74
Authors
P. K. Mukherjee
1,
Saurabh Singhal
1,
Vikas Adlakha
1,
S. K. Rai
1,
Som Dutt
1,
Aditya Kharya
1,
A. K. Gupta
1
Affiliations
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun 248 001, IN
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun 248 001, IN
Source
Current Science, Vol 112, No 04 (2017), Pagination: 802-810Abstract
A multi-collector (MC) inductively coupled plasma mass spectrometer (ICPMS) was used in combination with an Excimer (193 nm) laser to carry out in situ U-Pb dating of zircons. High performance twovolume sample cell provided unmatched laser ablated aerosol transportation efficiency resulting in reducing laser-related down-hole fractionation. Three wellcharacterized natural zircon reference standards (Harvard zircon 91500, GJ-1 zircon, Plesovice) were repeatedly measured in different sessions to evaluate the analytical figures of merits. Precision of <1% was achieved for spot sizes 20 μm with accuracies well within 2% of the reference values for these standards. Zircons from MCT Zone in the inner Lesser Himalaya reveal a highly discordant Palaeo-proterozoic (1901 ± 11 Ma) magmatic crystallization age inferred from the upper intercept in the concordia plot. The 207Pb/206Pb ages are also internally consistent with the disconcordia age with a weighted mean of 1900 ± 10 Ma and in turn suggest a major phase of Palaeo-proterozoic magmatic activity along the northern margin of Indian craton, while Early Miocene (~25 Ma) Pb loss in zircon inferred from lower intercept in disordria may be related to tectono-thermal activity along MCT.Keywords
LA–MC–ICPMS, Lesser Himalaya, MCT Zone, U–Pb Geochronology, Zircon.Full Text
- Occurrence of kornerupine-bearing granulite from Kunjan locality, Salem district, Tamil Nadu, India
Abstract Views :193 |
PDF Views:79
Authors
D. Prakash
1,
C. K. Singh
1,
R. S. Kumar
2,
R. Yadav
1,
S. K. Rai
1,
M. K. Yadav
3,
Pradip K. Singh
1,
S. Jaiswal
1
Affiliations
1 Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Earth Sciences, Annamalai University, Annamalai Nagar 608 002, IN
3 Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, IN
1 Centre of Advanced Study in Geology, Banaras Hindu University, Varanasi 221 005, IN
2 Department of Earth Sciences, Annamalai University, Annamalai Nagar 608 002, IN
3 Centre of Advanced Study in Geology, University of Lucknow, Lucknow 226 007, IN
Source
Current Science, Vol 121, No 9 (2021), Pagination: 1241-1248Abstract
Kornerupine, although a rare mineral, has been reported from several locations around the world in various types of aluminomagnesian Proterozoic rocks subjected to amphibolite and granulite facies metamorphism. Here we report the occurrence of kornerupine in quartzo-feldspathic gneisses near Kunjan town located in the southwestern part of Salem district, Tamil Nadu, India. These kornerupine granulites show well-preserved retrogression texture, involving hydration reactions which helped develop the various mineral assemblages. The common stable assemblage in these granulites is orthopyroxene–cordierite–kornerupine–biotite–spinel–K-feldspar–plagioclase. The P–T conditions of these granulites have been derived using the winTWQ program, which gives results of ~800°C and ~6 kbar for kornerupine-bearing assemblage. The high P–T assemblage reported from this area bears a significant relationship with the metamorphic history and exhumation of the Salem–Namakkal blockKeywords
Hydration reactions, kornerupine granulites, metamorphic evolution, mineral assemblages, retrogression texture.Full Text
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