During the research work, we appreciated advice from Senior Engineer Yang Bin of the Gansu Province Geology and Mining Bureau and Zhang Xiang, Engineer, of Gansu Province Geological Survey. We thank the editors and anonymous reviewers for comments that greatly improved the presentation of the paper. Thanks to Shuangshuang Wang for the help during the laboratory work. This study was supported by the National Natural Science Foundation of China (Grant No. 41173014), the Central Universities Fundamental Research Project (Lzu-Jbky-2012-128), and Gansu Key Laboratory of Mineral Resources in Western China (Lanzhou University) funded project.
The Paleo-Asian Ocean (Southern Mongolian Ocean) ophiolitic belts and massive granitoids are exposed in the Alxa block, in response to oceanic subduction processes. In this work, we report petrographic, geochem- ica...