Funding for this research was provided by:
Science Fund for Creative Research Groups (41521002)
National Natural Science Foundation of China (41672282)
the National Natural Science Foundation of China (41472296)
China Geological Survey (DD20190717)
Article History
Received: 10 December 2018
Revised: 12 June 2019
Accepted: 14 June 2019
First Online: 29 July 2019