Deep seismic reflection profiling and broad-band magnetotelluric sounding of the Qilian Orogenic Belt: evidence for bi-directional subduction of the Proto-Tethys Ocean plate and northward growth of the Qinghai-Tibet Plateau

Xuanhua Chen1, Rui Gao2, Xiaosong Xiong1, Zhaogang Shao1, Bing Li1 and Yiping Zhang1, (1)Chinese Academy of Geological Sciences, SinoProbe Center, Beijing, China, (2)Institute of Geology, Chinese Academy of Geological Sciences, Beijing, China