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Mukherjee, P. K.
- In situ U-Pb Zircon Micro-Geochronology of MCT Zone Rocks in the Lesser Himalaya Using LA–MC–ICPMS Technique
Abstract Views :229 |
PDF Views:77
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
- Migmatization, Granite Generation and Melt Accumulation in the Himalayan Orogenic Channel, Central and Eastern Bhutan
Abstract Views :274 |
PDF Views:85
Authors
Affiliations
1 CSIR-Central Building Research Institute, Roorkee 247 667, IN
2 Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee 247 667, IN
3 Department of Geosciences, Texas Tech University, Lubbock, TX 79409, US
1 CSIR-Central Building Research Institute, Roorkee 247 667, IN
2 Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee 247 667, IN
3 Department of Geosciences, Texas Tech University, Lubbock, TX 79409, US
Source
Current Science, Vol 114, No 09 (2018), Pagination: 1903-1912Abstract
In Central and Eastern Bhutan Himalaya, the Great Himalayan Sequence (GHS) reveals mesoscopic structures within the migmatite–leucogranite association due to crustal anataxis above the Main Central Thrust (MCT). The first phase of dominant melting generates stromatitic migmatite along the main foliation during high grade of metamorphism, possibly by dehydration melting. Subsequent ductile strike–slip shearing caused in situ melting in dilatational sites to produce structureless, non-foliated patchy leucogranite leucosome as well as in boudin necks and post-tectonic patches. In addition, melt-enhanced deformation caused doming of accumulated melt and subsidiary ductile shear zones on either margins of these domes. Surrounded by biotite-rich melanosome, leucosomes destroy the pre-existing foliation during new anatectic phase, which post-dates earlier stromatitic migmatite. These migmatites are the snapshot of mutual relations between newly-developed migmatite and leucogranite melt, and signify the transportation of Himalayan Orogenic Channel to the extreme south in Central and Eastern Bhutan over the Lesser Himalayan sedimentary belt along the MCT.Keywords
Bhutan, Channel, Himalayan Orogenic Migmatite, Leucogranite.Full Text
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