1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2. CAS Center for Excellence in Deep Earth Science, Guangzhou, 510640, China
3. University of Chinese Academy of Sciences, Beijing 10069, China
4. Norwegian Geotechnical Institute (NGI), P.O. Box 3930 Ullevaal Stadion, N-0806 Oslo, Norway
5. Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway