Characterizing anatexis in the Greater Himalayan Sequence (Kumaun, NW India) in terms of pressure, temperature, time and deformation

Phukon, Purbajyoti; Sen, Koushik; Singh, Prem; Sen, Aranya; Srivastava, H. K.; Singhal, Saurabh

doi:10.1016/j.lithos.2019.04.018

Cited by 11 publications

(3 citation statements)

References 157 publications

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“…It consists of MC-ICPMS (Neptune-plus, ThermoFisher Scientific Inc.) and a 193 mm excimer laser (UV Laser, Model Analyte G2, Cetec-Photon machine Inc.), equipped with a high-performance HelEx-II sample chamber. The methodology adopted is similar to that of Phukon et al (2019). The analyses were carried out with energy density 4 J cm −2 , a repetition rate of 5 Hz, 75 % laser intensity and 175 total shots per analysis, i.e.…”

Section: B Zircon U-pb La-mc-icp-ms Datingmentioning

confidence: 99%

“…Plausible petrogenetic models to explain the genesis of these leucogranites also vary from muscovite-dehydration melting (Patiño Douce & Harris, 1998;Phukon et al 2019) to biotite-dehydration melting (Visonà & Lombardo, 2002;Visonà et al 2012;Groppo et al 2013) to decompression melting (Zhang et al 2004(Zhang et al , 2005 and water flux melting (Harris & Massey, 1994;Davidson et al 1997). Thus, inferring a uniform source and postulating one single Yin, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Understanding pre- and syn-orogenic tectonic evolution in western Himalaya through age and petrogenesis of Palaeozoic and Cenozoic granites from upper structural levels of Bhagirathi Valley, NW India

Sen

Chatterjee

et al. 2021

Geol. Mag.

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The Himalaya is characterized by the presence of both pre-Himalayan Palaeozoic and syn-Himalayan Cenozoic granitic bodies, which can help unravel the pre- to syn-collisional geodynamics of this orogen. In the Bhagirathi Valley of Western Himalaya, such granites and the Tethyan Himalayan Sequence (THS) hosting them are bound to the south by the top-to-the-N extensional Jhala Normal Fault (JNF) and low-grade metapelite of the THS to its north. The THS is intruded by a set of leucocratic dykes concordant to the JNF. Zircon U–Pb laser ablation multi-collector inductively coupled plasma mass spectrometry (LA-MC-ICP-MS) geochronology of the THS and one leucocratic dyke reveals that the two rocks have a strikingly similar age distribution, with a common and most prominent age peak at ~1000 Ma. To the north of the THS lies Bhaironghati Granite, a Palaeozoic two-mica granite, which shows a crystallization age of 512.28 ± 1.58 Ma. Our geochemical analysis indicates that it is a product of pre-Himalayan Palaeozoic magmatism owing to extensional tectonics in a back-arc or rift setting following the assembly of Gondwana (500–530 Ma). The Cenozoic Gangotri Leucogranite lies to the north of Bhaironghati Granite, and U–Pb dating of zircon from this leucogranite gives a crystallization age of 21.73 ± 0.11 Ma. Our geochemical studies suggest that the Gangotri Leucogranite is a product of muscovite-dehydration melting of the lower crust owing to flexural bending in relation to steepening of the subducted Indian plate. The leucocratic dykes are highly refracted parts of the Gangotri Leucogranite that migrated and emplaced along extensional fault zones related to the JNF and scavenged zircon from the host THS during crystallization.

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Section: B Zircon U-pb La-mc-icp-ms Datingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Understanding pre- and syn-orogenic tectonic evolution in western Himalaya through age and petrogenesis of Palaeozoic and Cenozoic granites from upper structural levels of Bhagirathi Valley, NW India

Sen

Chatterjee

et al. 2021

Geol. Mag.

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“…The Chiplakot Crystalline Belt is less fractionated and may have intruded during a later part of continental arc magmatism into a thinner crust, associated with crustal extension probably driven by slab break-off and/or slab rollback. Phukon et al (2019) established relationships between peak metamorphism and partial melting of the GHS along with spatio-temporal relationship between anatexis and fault along the Kali River Valley, Kumaon Himalaya. Southern tectonic boundary of the GHS (Main Central Thrust-MCT) is marked based on structural, metamorphic and chronological evidences.…”

Section: Kali Valleymentioning

confidence: 99%

Tectonics of the Western, Sikkim and Arunachal Himalaya

Jain¹,

Thakur²,

Joshi³

et al. 2020

PINSA

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During the period 2016-2020, the Indian scientists undertook extensive research in the Himalayan Orogen, which incorporated extensive field mapping, structural analysis, geochemistry, metamorphic and igneous petrology, stratigraphy and palaeontology, Ar/Ar and U-Pb geochronology, besides low-temperature thermochronology. These activities were almost spread throughout the belt from western sector through Garhwal-Kumaon, Sikkim, Bhutan and Arunachal Pradesh. In addition, research was also undertaken using magnetotelluric methods for large-scale tectonics, seismology, paleoseismology and other disciplines, which are covered in other contributions. National laboratories have now started generating highresolution U-Pb dates, which have been providing impetus to model Himalayan tectonics, besides modelling its Paleoproterozoic and Neoproterozoic configuration.

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Records of Himalayan Metamorphism and Contractional Tectonics in the Central Himalayas (Darondi Khola, Nepal)

Catlos

2023

Compressional Tectonics

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Characterizing anatexis in the Greater Himalayan Sequence (Kumaun, NW India) in terms of pressure, temperature, time and deformation

Cited by 11 publications

References 157 publications

Understanding pre- and syn-orogenic tectonic evolution in western Himalaya through age and petrogenesis of Palaeozoic and Cenozoic granites from upper structural levels of Bhagirathi Valley, NW India

Understanding pre- and syn-orogenic tectonic evolution in western Himalaya through age and petrogenesis of Palaeozoic and Cenozoic granites from upper structural levels of Bhagirathi Valley, NW India

Tectonics of the Western, Sikkim and Arunachal Himalaya

Records of Himalayan Metamorphism and Contractional Tectonics in the Central Himalayas (Darondi Khola, Nepal)

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