The emplacement, alteration, subduction and metamorphism of metagranites from the Tso Morari Complex, Ladakh Himalaya

Abstract Eclogite-facies mineral assemblages are commonly preserved in mafic protoliths within continental terranes. It is widely accepted that the entirety of these terrains must also have been subducted to eclogite-facies conditions. However, evidence felsic material transformed at conditions lacking. Low-strain metagranites ultrahigh-pressure metamorphic Tso Morari Complex Ladakh, Himalaya, host sills and preserve subduction Following metamorphism, granites their gneissic equivalents were overprinted by amphibolite-facies Barrovian obscuring earlier history. We present a complex magmatic, hydrothermal polymetamorphic history involved four stages. Stage 1 was magmatic crystallisation, record which primary igneous mineralogy relict microstructures. Monazite grains U–Pb age 474.0 ± 11.6 Ma, concurrent with published zircon crystallisation age. 2 represents pervasive late-magmatic alteration granite during emplacement evident composition, particularly white micas domains. 3 (ultra)high-pressure metamorphism bodies Himalayan material. The high-pressure stage (>25 kbar 550–650°C) as thin coronas garnet phengite around biotite, kyanite inclusions pseudomorphs after cordierite, rare palisade quartz textures coesite. 4 result replacement biotite. Many features localised textural domains rock, where local equilibrium important anhydrous limited reaction progress, though aided preservation potential. Collectively, stages 480 Myr reworking northernmost Indian plate.