1 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China; jmsun@mail.igcas.ac.cn brent.alloway@vuw.ac.nz.
2 School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington 6012, New Zealand; jmsun@mail.igcas.ac.cn brent.alloway@vuw.ac.nz.
3 Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China; Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;
4 Department of Geology, University of Leicester, Leicester LEI 7RH, United Kingdom.