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Cai et al., 2010) also have ridge subduction. Due to the special structure and shape of ridges, ridge subduction plays an important role in the angle of the subduction slab, the thermal structure of subduction zones, magmatism, and mineralization (Cole & Stewart, 2009;Z. Zhang et al., 2010). Therefore, the identification of ridge subduction in the subduction zone is very important for understanding the tectonic evolution. The Qiangtang terrane in the central Tibet is sandwiched between the Bangong-Nujiang Suture and Jisha Suture. The Shuanghu Suture Zone divided the Qiangtang terrane into eastern Qiangtang and western Qiangtang subterrane, which is the key area for the evolution of the Shuanghu Palaeo-Tethys Ocean (C. Li, Zhai, Wang, Yin, & Mao, 2009). However, there are different opinions about the closing time of Shuanghu Palaeo-Tethys Ocean, including: (a) studies on the high-pressure metamorphic rocks in the central