School of Geography and Planning, Ludong University, Yantai 264025, Shandong, China

Sedimentary are minerals good carrier to record material source and paleoclimatic change. Using microscope identification of detritalminerals and X-ray diffraction (XRD) , the authors analyse the clayminerals of 13 samp les from 2 profiles of loess-like loess in Zhifu Island, and the data by mathematical statistics. The results show the mineral taxa, morphological characteristics and the high contents of magnetite and deris revealed the multi-sources and near-derived features of the loess-like loess in Zhifu Island, and the main sources of loess are seabed plain, diluvium and residual sediments in the last glacial period, while thin sediments from Northwest inland desert are rare. The late period of loess accumulation with high contents of hornblende and epidote is mainly far source sedimentary with wind transport, and the early and middle periods of loess accumulation with high contents of magnetite and deris are mainly near-source sedimentary with comp lex transport. Profile sequence characteristics of loess and vertical variational characteristics of detrital and clayminerals indicate the climate in Zhifu Island was warm and wet in early period of loess accumulation, then changed to cold and dry, after that turned to warm, and to cold again. The fact shows the climate cycle of cold-warm alternate in the last glacial period.