Funding for this research was provided by:
National Key R&D Program of China (2017YFB0502700)
National Natural Science Foundation of China (61331016, 41702376, 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