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Nature of the Shyok (Northern) Suture Zone between India and Asia: petrology, geochemistry and origin of the Tirit granitoids and associated dykes (Nubra Valley Ladakh Himalaya, NW India)

Published online by Cambridge University Press:  03 April 2023

Rakesh Chandra ,
Nazia Kowser ,
Michael E Brookfield Open the ORCID record for Michael E Brookfield [Opens in a new window] ,
Manavalan Satyanarayanan  and
Daniel Stöckli
Rakesh Chandra
Affiliation:
Department of Earth Sciences, University of Kashmir, Srinagar 190 006, India
Nazia Kowser
Affiliation:
Department of Earth Sciences, University of Kashmir, Srinagar 190 006, India
Michael E Brookfield*
Affiliation:
Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78712, USA
Manavalan Satyanarayanan
Affiliation:
CSIR – National Geophysical Research Institute, Hyderabad 500 007, India
Daniel Stöckli
Affiliation:
Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78712, USA
*
Author for correspondence: ME Brookfield, Email: mbrookfi@gmail.com
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Abstract

The Shyok Suture Zone is an oceanic remnant of the Neo-Tethyan ocean sandwiched between the Ladakh Batholiths to the south and Karakoram Batholith to the north. The Tirit granitoids in this suture are dark-coloured, relatively rich in ferromagnesian minerals and range from granodiorite–tonalite to gabbro–diorite in composition. Mafic igneous enclaves are quite common and they are intruded by NW–SE parallel doleritic and aplitic dykes. The Tirit granitoids have a wide range of major oxide compositions (SiO2 = 52.1–72.11 wt %, TiO2 = 0.21–1.23 wt %, Al2O3 = 11.42–13.52 wt %, MgO = 1.69–10.69 wt % and CaO = 3.24–9.31 wt %) and show calc-alkaline, metaluminous, I-type characteristics, transitional between primitive and mature arc continental plutons. Rare earth elements (REE) show considerable enrichment in light REE (LREE) as compared to the heavy REE (HREE). Late Cretaceous U/Pb dates (74–68 Ma) show that they formed during the pre-collision northward movement of India. The Tirit dykes are only slightly younger and probably part of the same episode.

Keywords

Granitoidsdykesenclavesmagmatismgeochronologysubduction
Type
Original Article
Information
Geological Magazine , Volume 160 , Issue 5 , May 2023 , pp. 1020 - 1039
Copyright
© The Author(s), 2023. Published by Cambridge University Press

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