1. School of Earth Sciences and Key Laboratory of Mineral Resources in Western China (Gansu Province)Lanzhou University Lanzhou 730000 China
2. Key Laboratory of Western China's Environmental Systems, Ministry of Education of China & College of Resources and EnvironmentLanzhou University Lanzhou Gansu 730000 China
3. Paleomagnetic Laboratory ‘Fort Hoofddijk’Utrecht University 3584 CD Utrecht The Netherlands
4. Lab of Coast and Ocean Geology, Third Institute of OceanographyState Oceanic Administration Xiamen 361005 China
5. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth EnvironmentChinese Academy of Sciences Xi'an 710075 China
6. State Key Laboratory of Biogeology and Environmental Geology and School of Ocean SciencesChina University of Geosciences Beijing 100083 China