Funding for this research was provided by:
National Key R&D Program of China (2017YFB0502700)
National Natural Science Foundation of China (61331016)
National Natural Science Foundation of China (41702376)
National Natural Science Foundation of China (41774006)
Fundamental Research Funds for the Central Universities, China University of Geosciences (CUG170634)
Article History
Received: 28 December 2017
Accepted: 1 March 2018
First Online: 24 March 2018