1. Institute of Geology Chinese Academy of Geological Sciences No. 26 Baiwanzhuang Road, Xicheng District Beijing 100037 China
2. Department of Geology University of Vienna Althanstrasse 14 A‐1090 Vienna Austria
3. Geothermal Department Chinese Academy of Geological Sciences No. 26 Baiwanzhuang Road, Xicheng District Beijing 100037 China