Early Processes and Tectonic Model for the India-Asia Continental Collision: Evidence from the Cenozoic Gangdise Igneous Rocks in Tibet HOU Zengqian1, MO Xuanxue2, GAO Yongfeng3, YANG Zhiming1, DONG Guochen2 and DING Lin4 (1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037; 2. China University of Geosciences, Beijing 100083; 3. Shijiazhuang College of Economy, Shijiazhuang, Hebei 050031; 4. Institute of Qinghai-Tibetan Plateau, China Academy …