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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)
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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)
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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)
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Journal Article
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)
2023
Overview
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.
