Abstract
The granites and granite gneisses from a tectono-metamorphic complex exposed along the Shyok Valley in the Karakoram region, India, forms the southern margin of Asian plate in the India-Asia collision zone. These rocks have been subjected to mineralogical, geochemical, and U-Pb zircon geochronological investigations to constrain the petrogenetic and geodynamic evolution of the Karakoram terrane. Outcrop-scale observations reveal the presence of pre- and syn-kinematic leucogranite bodies intruded within the granites and granite gneisses. The foliation-parallel deformed leucogranite sill shows the dextral shear sense in an extensive metamorphic complex that is in concordance with the Karakoram Fault (KF) in the Ladakh region, NW India. Whole-rock elemental and biotite chemistry equivocally suggest subduction-related metaluminous (I-type) calc-alkaline nature for most of the host granites and gneisses, and generation of syn-collisional peraluminous (S-type) leucogranites through crustal anatexis of pre-existing rocks. The obtained U-Pb zircon ages for the granites, granite gneisses, deformed and undeformed leucogranites vary widely from ca. 160 Ma to 15 Ma and reveal: (a) the initiation of subduction of the Neo-Tethyan oceanic crust beneath the southern Asian Plate at least ~160 Ma ago, and (b) existence of continuous or intermittent deformation along ~1000 km long lithospheric scale dextral KF during ~27−15 Ma.
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Acknowledgements
Anil Gupta (former director) and Kalachand Sain (director), Wadia Institute of Himalayan Geology, Dehradun, are thanked for motivation and generous supports during the research work. Manoranjan Mohanty and Rajwant, Department of Science and Technology (DST) and Science and Engineering Research Board (SERB), New Delhi, are thanked for their continuous encouragement. Pulok Kumar Mukherjee and Athokpam Krishnakanta Singh are thanked for scientific discussions. We thank Ramesh Chandra Patel and Nand Lal (National Facility for Low-Temperature Thermochronology, Kurukshetra University) for providing access to their lab for zircon mounts polishing. Naresh Kumar Juyal helped during CL imaging, and Chandra Shekhar helped while ICPMS and XRF analyses. Satyajeet Singh Thakur is thanked for help during EPMA. Chhutapa Phuntsog Dorjay, Skalzang Namgyal, and Thinless Gyachho are thanked for field assistance. Gajender Kumar, Saurabh Gupta, and Kapil S. Panwar are especially thanked for the help rendered during the preparation of the manuscript. The Indo-Tibetan Border Police (ITBP) is highly acknowledged for help during fieldwork in the border area of the Ladakh region. Constructive comments of two anonymous reviewers, associate editor Qiuli Li and chief editor Lutz Nasdala, helped to improve the manuscript. This work was supported by Science and Engineering Research Board grant EMR/2014/000555 awarded to Vikas Adlakha.
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Pundir, S., Adlakha, V., Kumar, S. et al. Petrology, geochemistry and geochronology of granites and granite gneisses in the SE Karakoram, India: Record of subduction-related and pre- to syn-kinematic magmatism in the Karakoram Fault Zone. Miner Petrol 114, 413–434 (2020). https://doi.org/10.1007/s00710-020-00706-y
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DOI: https://doi.org/10.1007/s00710-020-00706-y