U-Pb zircon ages and Sm-Nd isotopic characteristics of the Lesser and Great Himalayan sequences, Uttarakhand Himalaya, and their regional tectonic implications

Mukherjee, Pinaki; Jain, Arvind K.; Singhal, Saurabh; Singha, Nikunj B.; Singh, Sandeep; Kumud, Kislay; Seth, Puneet; Patel, Ramesh C.

doi:10.1016/j.gr.2019.06.001

Cited by 62 publications

(51 citation statements)

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“…metamorphic-grade rocks (Searle et al, 2008;Larson and Godin, 2009). In contrast to the "traditional" definition that positions the MCT along the base of the GHS protolith, the structural boundary and the protolith boundary of the GHS/LHS do not always coincide (e.g., Larson and Godin, 2009;Larson et al, 2010b;Tobgay et al, 2010;McKenzie et al, 2011;Yakymchuk and Godin, 2012;Mottram et al, 2014;Braden et al, 2018Braden et al, , 2020Mukherjee et al, 2019;Hopkinson et al, 2020). Therefore, to avoid confusing the conflicting structural and protolith GHS definitions, the HMC is used here to describe the rocks in the hanging wall of the MCT, which can include rocks of both "GHS" and "LHS" protolith affinities (Fig.…”

Section: Research Papermentioning

confidence: 97%

“…However, data from NW India, Sikkim, and Bhutan Himalaya suggest that rocks with GHS εNd (0) values can appear in the footwall of the MCT, although mostly in the outer LHS rocks (upper LHS in McQuarrie et al, 2008) that have Paleozoic depositional ages. Conversely, rocks with LHS εNd (0) values have also been observed in the hanging wall of the MCT (Chakungal et al, 2010;Tobgay et al, 2010;McKenzie et al, 2011;Mottram et al, 2014;Mukherjee et al, 2019;Hopkinson et al, 2020).…”

Section: Sm-nd Isotopic Geochemistrymentioning

confidence: 99%

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Protolith affiliation and tectonometamorphic evolution of the Gurla Mandhata core complex, NW Nepal Himalaya

et al. 2021

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Assigning correct protolith to high metamorphic-grade core zone rocks of large hot orogens is a particularly important challenge to overcome when attempting to constrain the early stages of orogenic evolution and paleogeography of lithotectonic units from these orogens. The Gurla Mandhata core complex in NW Nepal exposes the Himalayan metamorphic core (HMC), a sequence of high metamorphic-grade gneiss, migmatite, and granite, in the hinterland of the Himalayan orogen. Sm-Nd isotopic analyses indicate that the HMC comprises Greater Himalayan sequence (GHS) and Lesser Himalayan sequence (LHS) rocks. Conventional interpretation of such provenance data would require the Main Central thrust (MCT) to be also outcropping within the core complex. However, new in situ U-Th/Pb monazite petrochronology coupled with petrographic, structural, and microstructural observations reveal that the core complex is composed solely of rocks in the hanging wall of the MCT. Rocks from the core complex record Eocene and late Oligocene to early Miocene monazite (re-)crystallization periods (monazite age peaks of 40 Ma, 25–19 Ma, and 19–16 Ma) overprinting pre- Himalayan Ordovician Bhimphedian metamorphism and magmatism (ca. 470 Ma). The combination of Sm-Nd isotopic analysis and U-Th/ Pb monazite petrochronology demonstrates that both GHS and LHS protolith rocks were captured in the hanging wall of the MCT and experienced Cenozoic Himalayan metamorphism during south-directed extrusion. Monazite ages do not record metamorphism coeval with late Miocene extensional core complex exhumation, suggesting that peak metamorphism and generation of anatectic melt in the core complex had ceased prior to the onset of orogen-parallel hinterland extension at ca. 15–13 Ma. The geometry of the Gurla Mandhata core complex requires significant hinterland crustal thickening prior to 16 Ma, which is attributed to ductile HMC thickening and footwall accretion of LHS protolith associated with a Main Himalayan thrust ramp below the core complex. We demonstrate that isotopic signatures such as Sm-Nd should be used to characterize rock units and structures across the Himalaya only in conjunction with supporting petrochronological and structural data.

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Section: Research Papermentioning

confidence: 97%

Section: Sm-nd Isotopic Geochemistrymentioning

confidence: 99%

Protolith affiliation and tectonometamorphic evolution of the Gurla Mandhata core complex, NW Nepal Himalaya

et al. 2021

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“…2.3) (e.g. Larson and Godin, 2009;Larson et al, 2010;Tobgay et al, 2010;McKenzie et al, 2011;Yakymchuk and Godin, 2012;Mottram et al, 2014a;Braden et al, 2018;Mukherjee et al, 2019;Braden et al, 2020;Hopkinson et al, 2020;Godin et al, 2021). The Main Central thrust initiated ca.…”

Section: The Himalayan Orogenmentioning

confidence: 99%

“…The Himalayan system exposes extensive volumes of high metamorphic-grade rocks and granites, mostly found in the hanging wall of the early Miocene Main Central thrust (e.g. Burg et al, 1984;Stephenson et al, 2001;Catlos et al, 2004;Martin et al, 2005;Imayama and Arita, 2008;Searle et al, 2008;Larson and Godin, 2009;Larson et al, 2010;Tobgay et al, 2010;McKenzie et al, 2011;Yakymchuk and Godin, 2012;Mottram et al, 2014a;Braden et al, 2017;Braden et al, 2018;Mukherjee et al, 2019;Braden et al, 2020;Hopkinson et al, 2020;Godin et al, 2021).…”

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confidence: 99%

Timing and Source of Melting at the Eastern Edge of the Gurla Mandhata Core Complex, Nw Nepal Himalaya

Martin¹,

Provided²,

Godin³

et al. 2020

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northwest sense of shear at ca. 15 Ma to 13 Ma, the Chuwa Khola exhibits dominant top-tothe southwest suggesting the existence of a strain partitioning boundary between the two areas.v ACKNOWLEDGEMENTS I would like to first and foremost thank my supervisor, Dr. Laurent Godin, for giving me the chance to work on such an exciting and challenging project, as well as for allowing me to travel to one of the most beautiful places on the planet. This has been a life changing opportunity and I am very grateful to have had his support and guidance through it all. I would also like to thank John Cottle for his expertise in guiding monazite petrochronology. I also thank Chris Yakymchuk for his invaluable help with interpreting my geochemical analyses.Thank you to the following people for their analytical and technical assistance: Agatha Dobosz for her help with thin section mapping and mineral characterization on the scanning electron microscope; Brian Joy for his help with X-ray chemical mapping of monazites on the electron microprobe; and Andrew Kylander-Clark (UCSB) for his help with guiding monazite petrochronology. I would also like to thank my thesis examination committee, Dr.

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“…In a parallel valley towards east along Alakhnanda-Dahaliganga valley, Garhwal Himalaya, Mukherjee et al (2019) reported U-Pb zircon age from deformed intrusive garnetiferous leucogranite around 480 Ma with older inherited Neoproterozoic cores. They also reported Paleoproterozoic Magmatic arc at the basal HHC i.e.…”

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confidence: 99%

Himalayan Magmatic Events

Singh¹,

Kumar²,

Gupta³

et al. 2020

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U-Pb zircon ages and Sm-Nd isotopic characteristics of the Lesser and Great Himalayan sequences, Uttarakhand Himalaya, and their regional tectonic implications

Cited by 62 publications

References 77 publications

Protolith affiliation and tectonometamorphic evolution of the Gurla Mandhata core complex, NW Nepal Himalaya

Protolith affiliation and tectonometamorphic evolution of the Gurla Mandhata core complex, NW Nepal Himalaya

Timing and Source of Melting at the Eastern Edge of the Gurla Mandhata Core Complex, Nw Nepal Himalaya

Himalayan Magmatic Events

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