“…Thus, partial melting of thickened or delaminated lower continental crust at depths greater than 50 km is often invoked in the genesis of continental adakitic melts (Chung et al, 2003;Ma, Zheng, Xu, Griffin, & Zhang, 2015;Xie, Zeng, Liu, & Gao, 2010). For example, igneous rocks with adakitic geochemical signature have been widely used for tracing crustal thickening processes of the Himalayan-Tibetan orogen (Chen et al, 2013;Chung et al, 2009;Guan et al, 2012;Ji et al, 2012;Lu et al, 2019;Ma et al, 2014;Xie et al, 2010;Xu, Wang, Wang, Guo, & Pei, 2006;Zhang, Li, Cao, Zhang, & Yong, 2019;. However, studies have mainly focused on the Lhasa or Qiangtang terrane, northern part of the Himalayan-Tibetan orogen (Chen et al, 2013;Chung et al, 2009;Guan et al, 2012;Ji et al, 2012;Lu et al, 2019;Ma et al, 2014;, FIGURE 1 Tectonic map of the Himalaya-Tibetan Plateau region: (a) geotectonic sketch of southeastern Asia Yin & Harrison, 2000); (b) simplified geological map of Himalaya, showing the distribution of leucogranites (modified after Cao et al, 2018;Guillot et al, 2008;.…”