North Qilian Metamorphic Belt, Qilian Co., Haibei Autonomous Prefecture, Qinghai (Chinghai) Province, China

Blueschist belt, consisting of three tectonic slices within island-arc acid volcanic rocks. It mainly consists of high-pressure blueschists of various protoliths. Eclogite blocks of different size are randomly scattered within the blueschists and overprinted by late blueschist facies minerals.

Lawsonite was reported from an undisclosed eclogite within the belt.

Ref.:
- Song Shuguang, Zhang Lifei, Niu Yaoling, Song Biao, Zhang Guibing, and Wang Qianjie (2004): Zircon U-Pb SHRIMP ages of eclogites from the North Qilian Mountains in NW China and their tectonic implication. Chinese Science Bulletin 49(8), 848-852.
- Zhang Jianxin, and Meng Fancong (2006): Lawsonite-bearing eclogites in the north Qilian and north Altyn Tagh: Evidence for cold subduction of oceanic crust. Chinese Science Bulletin 51(10), 1238-1244.
- Zhang, J.X., Meng, F.C., and Wan, Y.S. (2007): A cold early Paleozoic subduction zone in the North Qilian Mountains, NW China: petrological and U-Pb geochronological constraints. Journal of Metamorphic Geology 25(3), 285-304.
- Song, S., Zhang, L., Niu, Y., Wei, C., Liou, J.G., and Shu, G. (2007): Eclogite and carpholite-bearing meta-pelite in the North Qilian suture zone, NW China: implications for Paleozoic oceanic subduction. Journal of Metamorphic Geology 25(4), 495.