Fluid-present and fluid-absent melting of muscovite in migmatites in the Himalayan orogen: Constraints from major and trace element zoning and phase equilibrium relationships

The origin and compositions of melt inclusions in an Al2SiO5‐free paragneiss from the Namche Barwa Complex in the Eastern Himalayan Syntaxis

“…The Himalaya, the highest orogen in the world, was formed by continental collision between the Indian and the Eurasian plate at circa 55–50 Ma (e.g., Ding et al, 2016; Guillot et al, 2003; Najman et al, 2010; Yin & Harrison, 2000; Zhu et al, 2015). Widespread crustal anatexis occurred ~30 Ma after the collisioninvolving partial melting of metasedimentary rocks under fluid‐present or fluid‐absent conditions at different structural levels along the Himalayan chain (e.g., Gao et al, 2017; Meng et al, 2021; Weinberg, 2016). Most of rocks in the Eastern Himalayan Syntaxis (EHS), including orthogneiss, paragneiss and amphibolite, underwent high‐pressure (HP) granulite‐facies metamorphism and partial melting from circa 40 to 20 Ma (e.g., Ding et al, 2021; Rubatto et al, 2013; Zhang et al, 2015) at 1.1–1.8 GPa and 700–900°C (e.g., Booth et al, 2009; Ding et al, 2001; Guilmette et al, 2011; Tian et al, 2016).…”