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Closure of India–Asia collision margin along the Shyok Suture Zone in the eastern Karakoram: new geochemical and zircon U–Pb geochronological observations

Published online by Cambridge University Press:  24 February 2020

Shailendra Pundir ,
Vikas Adlakha Open the ORCID record for Vikas Adlakha [Opens in a new window] ,
Santosh Kumar  and
Saurabh Singhal
Shailendra Pundir
Affiliation:
Wadia Institute of Himalayan Geology, Dehradun, Uttarakhand, 248001, India
Vikas Adlakha*
Affiliation:
Wadia Institute of Himalayan Geology, Dehradun, Uttarakhand, 248001, India
Santosh Kumar
Affiliation:
Centre of Advanced Study, Department of Geology, Kumaun University, Nainital, Uttarakhand, 263001, India
Saurabh Singhal
Affiliation:
Wadia Institute of Himalayan Geology, Dehradun, Uttarakhand, 248001, India
*
Author for correspondence: Vikas Adlakha, Email: [email protected]
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Abstract

New whole-rock geochemical analyses along with laser ablation multi-collector inductively coupled plasma mass spectrometry U–Pb zircon ages of the granite–rhyolite from the Karakoram Batholith, exposed along the Shyok Valley, NW India, have been performed to understand the timing and geochemical evolution of these magmatic bodies and their implications for the geodynamic evolution of the Karakoram Batholith. New geochronological data on granites and rhyolites along with previously published geochronological data indicate that the Karakoram Batholith evolved during Albian time (~110–100 Ma) owing to the subduction of Tethys oceanic lithosphere along the Shyok Suture Zone. This region witnessed a period of no magmatism during ~99–85 Ma. Following this, the Kohistan–Ladakh arc and Karakoram Batholith evolved as a single entity in Late Cretaceous and early Palaeogene times. Late Cretaceous (~85 Ma) rhyolite intrusions within the Karakoram Batholith show calc-alkaline subduction-related signatures with a highly peraluminous nature (molar A/CNK = 1.42–1.81). These intrusions may have resulted from c. ~13.8 % to ~34.5 % assimilation of pre-existing granites accompanied by fractional crystallization during the ascent of the magma. The contamination of mantle wedge-derived melts with crust of the active continental margin of the Karakoram most likely enhanced the high peraluminous nature of the rhyolite magma, as has been constrained by assimilation fractional crystallization modelling. Two granite samples from the contact of the Shyok Metamorphic Complex and Karakoram Batholith indicate that the post-collisional Miocene magmatism was not only confined along the Karakoram Fault zone but also extends ~30 km beyond the Shyok–Muglib strand.

Keywords

magmatismgeochronologyKarakoramShyok Suture Zone
Type
Original Article
Information
Geological Magazine , Volume 157 , Issue 9 , September 2020 , pp. 1451 - 1472
Copyright
© Cambridge University Press 2020

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Table S2

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