Palaeoproterozoic metamorphism in the Jeori-Wangtu Gneissic Complex (JWGC), western Himalayas

Pant, N. C.; Kundu, A.; Kumar, Rakesh; Dorka, B.S.; Prasher, S.

doi:10.1016/j.jseaes.2004.12.004

Cited by 10 publications

(10 citation statements)

References 28 publications

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“…2) suggests upper-greenschist conditions of metamorphism, according to the dehydration reaction of pyrophyllite, restricted to high-Al pelites, relative to alkalis (Miyashiro 1994). However, although Pant et al (2006) map kyanite schist directly in the hangingwall to the Munsiari Thrust (above the Rampur Window), we are not so confident about the structural position of the kyanite schists, and herein consider the lowest grade of the Jutogh Group to be garnet. Vannay et al (1999, Fig. 1) identified both sillimanite and kyanite in what we here recognize as the hanging wall of the Sarahan Thrust, i.e.…”

Section: Field Relations and Petrologymentioning

confidence: 81%

Tectonic implications of Palaeoproterozoic anatexis and Late Miocene metamorphism in the Lesser Himalayan Sequence, Sutlej Valley, NW India

Chambers

Argles

Horstwood

et al. 2008

JGS

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Key litho-tectonic units in the Himalaya e.g. the Greater Himalayan Sequence, and the major faults that bound them e.g. the Main Central Thrust, can be traced continuously along the 2400 km strike of the orogen (Fig. 1). Understanding the metamorphic evolution of such units together with the recognition of the nature, location and timing of the principle structural elements of an orogenic belt is fundamental both to defining the tectonic architecture of that belt and to understanding the mechanical behaviour of continental crust during its deformation. The Greater and Lesser Himalayan Sequences are two key litho-tectonic units in the Himalaya. Using provenance studies based on detrital zircon ages (DeCelles et al. 2000;

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Section: Field Relations and Petrologymentioning

confidence: 81%

Tectonic implications of Palaeoproterozoic anatexis and Late Miocene metamorphism in the Lesser Himalayan Sequence, Sutlej Valley, NW India

Chambers

Argles

Horstwood

et al. 2008

JGS

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“…To its north, the Main Boundary Thrust (MBT) separates it from the Lesser Himalaya (Lesser Himalaya Sediments, LHS; Figure 1a). The rocks of the Lesser Himalaya are un‐metamorphosed to weakly metamorphosed sediments of Palaeozoic to early Cambrian age with a large number of klippen (Devrani & Dubey, 2009; Jayangondaperumal & Dubey, 2001; Law et al, 2013; Pant, Kundu, Kumar, Dorka, & Prasher, 2006). A Precambrian age for the Lesser Himalayan rocks was proposed in the early 1900s and subsequently, the Lesser Himalaya sediments were termed as Peninsular Himalaya (Auden, 1935).…”

Section: Geology Of the Areamentioning

confidence: 99%

“…The Lesser Himalaya is thrusted over the Higher Himalaya Crystalline Sequence (HHCS) along the Main Central Thrust (MCT; Figure 1a). The HHCS, which forms the core of the Himalaya, consists of medium‐ to high‐grade metamorphic rocks which are intruded by Palaeozoic to Mesozoic leucogranite melts (Pant et al, 2006; Parrish & Hodges, 1996; Sen, Dubey, Tripathi, & Pfänder, 2012). The South Tibetian Detachment (STD) separates the Higher Himalayan rocks from the typically unmetamorphosed (or low‐grade) Neoproterozoic to Eocene sedimentary rocks of Tethyan Himalaya (Law et al, 2013).…”

Section: Geology Of the Areamentioning

confidence: 99%

Geochemistry of meta‐sediments from Neoproterozoic Shimla and Chail Groups of Outer Lesser Himalaya: Implications for provenance, tectonic setting, and paleo‐weathering conditions

et al. 2021

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The depositional history of the Himalayas has been overprinted by the tectonic activities during the Himalayan Orogeny. A detailed investigation of the sedimentary units can provide crucial information regarding their depositional history and provenance.This study aims at constraining the weathering history, tectonic setting, and provenance of meta-sediments from the Shimla and Chail Groups of Outer Lesser Himalaya. With similar major element chemistry, these meta-sediments comprise a low-silica group (avg. SiO 2 /Al 2 O 3 <3.29). Weathering intensity parameters chemical index of alteration (CIA), plagioclase index of alteration (PIA) and index of chemical variability (ICV) range from 62 to 78 (avg. = 69.41), 70 to 96 (avg. = 85.34), and 0.45 to 1.45 (avg. = 1.01), respectively indicating moderate to severe degrees of weathering. Transition element ratios [Cr/V (1.68-5.18), Ni/Co (1.47-30.99), and V/Ni (0.87-4.61)], and trace element bivariate plots suggest a recycled, felsic to intermediate provenance that has primarily been derived from Post-Archean sources with minor inputs from Archean units. A passive margin depositional setting with arcderived sources is suggested for the Chail and Shimla meta-sediments. Rare-earth element patterns reveal similarities between the studied metasediments with TTG gneisses and sanukitoids from the Aravalli and Bundelkhand Cratons, as well as Chaur and Jutogh granitoids. Therefore, Neoproterozoic Himalayan granitoids and ArcheanAravalli-Bundelkhand granitoids (TTGs and high-K granitoids) could be potential sources of these meta-sediments, as also suggested by the detrital zircon age distribution from the Beas-Satluj-Pabbar valleys and Shimla Group.

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“…There are few reports of pre-Himalayan metamorphism (Miller et al 2000). Using overprinted contact metamorphic assemblages on the Paleoproterozoic Jeori"Wangtu granite gneiss, Pant et al (2006) demonstrated the presence of pre ~1800Ma low-grade regional metamorphism in the Jeori-Wangtu Tectonic window in NW Himalaya. An early Paleozoic metamorphic and magmatic event is also reported from several sections of the Lesser Himalaya (e.g.…”

Section: And Ak Jainmentioning

confidence: 99%

A Re-look at the Himalayan metamorphism

2020

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Regional metamorphic rocks preserve records of geodynamic evolution of orogenic belts. The Himalaya represents an evolving mountain belt with a complex geological history and is considered here as a composite of Trans-Himalaya and the Himalaya per se and the intervening Indus-Tsangpo Suture Zone. Each of these three tectonic domains is evaluated in the context of their metamorphic evolution. An episodic evolution is inferred and described. The beginning of the Himalayan orogeny is ascribed to the Cretaceous initiation of the suturing of the 'island arc' rocks with the Asian block, followed by underthrusting of the Indian block ~57Ma ago. Differences in metamorphism of underthrust and overthrust blocks are reflected in their P-T-t evolution. The exhumation along the strike length was unequal with significantly higher exhumation rates along the syntaxes. The anatectic melt produced at the time of the Tertiary age Himalayan metamorphism got emplaced within the Himalaya as well as within the Trans-Himalaya, possibly through crustal-scale faults such as the Karakoram fault.

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Palaeoproterozoic metamorphism in the Jeori-Wangtu Gneissic Complex (JWGC), western Himalayas

Cited by 10 publications

References 28 publications

Tectonic implications of Palaeoproterozoic anatexis and Late Miocene metamorphism in the Lesser Himalayan Sequence, Sutlej Valley, NW India

Tectonic implications of Palaeoproterozoic anatexis and Late Miocene metamorphism in the Lesser Himalayan Sequence, Sutlej Valley, NW India

Geochemistry of meta‐sediments from Neoproterozoic Shimla and Chail Groups of Outer Lesser Himalaya: Implications for provenance, tectonic setting, and paleo‐weathering conditions

A Re-look at the Himalayan metamorphism

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