Mineral chemistry and K–Ar ages of plutons across the Karakoram fault in the Shyok-Nubra confluence of northern Ladakh Himalaya, India

A Cretaceous forearc ophiolite in the Shyok suture zone, Ladakh, NW India: Implications for the tectonic evolution of the Northwest Himalaya

“…The later northward subduction of the oceanic plate generated continental arc magmatism on the southern margin of the Karakoram block. This calc-alkaline magmatism has a zircon SHRIMP U-Pb and K-Ar biotite age of 97-115 Ma (Fraser et al, 2001;Ravikant, 2006;Searle et al, 1998;Thanh et al, 2010Thanh et al, , 2011Thanh et al, , 2012. These geochronological data are closely comparable with our data and those of Khan et al (2007) from basic rocks of the Shyok ophiolite.…”

“…97-115 Ma) batholiths and plutons that extend from North Pakistan through the Shyok-Nubra valley and the Pangong area in Ladakh to western Tibet (e.g. Fraser et al, 2001;Ravikant, 2006;Searle et al, 1999;Thanh et al, 2010). From their study of metamorphic rocks in the Pangong complex, Thanh et al (2011) suggested that subduction along the southern margin of the Karakoram block had caused prograde metamorphism of supracrustal rocks, giving rise to part of the Pangong complex ( Fig.…”

“…Deschamps et al (2010) suggested that the ophiolites at Spongtang and Nidar in the southern Ladakh arc formed in a forearc setting relative to northward subduction of Neo-Tethys beneath the Eurasian continental plate, corresponding to the Ladakh-Kohistan arc (100-40 Ma). The presence of two forearc ophiolitic complexes, corresponding to two magmatic arcs within the Ladakh-Kohistan region (Thanh et al, 2010), evidently suggests that there were two northward-dipping subduction zones in the northwestern Himalaya in the Cretaceous (Fig. 9a).…”

Age and structure of the Shyok suture in the Ladakh region of northwestern India: Implications for slip on the Karakoram fault system

“…The Ladakh block (Figures and ) makes up the bulk of the Ladakh Range (Figure a) and is comprised predominantly of calc‐alkaline batholithic rocks and their extrusive equivalents (typically referred to as the Khardung Volcanic sequence), with rare pendants of preintrusive country rock [ Weinberg and Dunlap , ; Thanh et al ., ]. Intrusive compositions range from gabbro to granite, while the Khardung (Kardung) Volcanics are dominantly felsic [ Dunlap and Wysoczanski , ].…”

Chromian-spinel compositions from the Bo Xinh ultramafics, Northern Vietnam: Implications on tectonic evolution of the Indochina block

“…They further suggest that a southward subduction model is unlikely because most of the intrusions are post-collisional rather than subduction-related granitoids in the southern Song Ma. The Red-river fault/shear zone is interpreted as a result of the India-Asia collision during Late-Paleocene and Early-Eocene (e.g., Patriat and Achache, 1984;Tapponnier et al, 1990;Thanh et al, 2010).…”