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- [9] Grain-size features of a Miocene loess-soil sequence at Qinan: Implications on its origin[J]. QIAO Yansong1,3, GUO Zhengtang2,1, HAO Qingzhen1, YIN Qiuzhen1, YUAN Baoyin1 & LIU Tungsheng1 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China;3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China.Science in China(Series D:Earth Sciences). 20