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Dutt, Som
- 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
- Regional disparity in summer monsoon precipitation in the Indian subcontinent during Northgrippian to Meghalayan transition
Abstract Views :184 |
PDF Views:77
Authors
Affiliations
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun 248 001, IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
3 School of Earth, Ocean and Climate Sciences, Indian Institute of Technology Bhubaneswar, Argul 752 050, IN
1 Wadia Institute of Himalayan Geology, 33, General Mahadeo Singh Road, Dehradun 248 001, IN
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur 721 302, IN
3 School of Earth, Ocean and Climate Sciences, Indian Institute of Technology Bhubaneswar, Argul 752 050, IN
Source
Current Science, Vol 120, No 9 (2021), Pagination: 1449-1457Abstract
The present study reveals distinct spatial variability of summer monsoon precipitation in Indian subcontinent during Northgrippian to Meghalayan transition. Protracted dry phase lasting ~1000 yrs was observed ~4.2 ka BP in southern and northwestern India whereas 200–300 yrs event occurred in northeastern parts. Strong El Niño conditions beginning ~4.3 kyr BP were associated with the millennial long dryness in western parts but its influence was limited in the eastern region. Cross-verified, high-resolution records from different geographic regions of India are still required to ascertain if regional differences occurred in span and magnitude during Northgrippian to Meghalayan transition.Keywords
Indian summer monsoon, Indus civilization, Late Holocene, 4.2 ka event, Meghalayan ageFull Text
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