1.Geophysical Measuring Exploration Institute of Liaoning Province, Shenyang 110032, China;

2. Faculty of Earth Sciences, China University of Geosciences (Wuhan), Wuhan 430074, China

Based on REE geochemical characteristics of the dolomites in Zhangcun profile, Middle Permian Qixia Formation, SW Sichuan Basin were studied by combined application of X??ray diffraction (XRD) and induc? tively coupled plasma?mass spectrometry (ICP??MS). The results show that the dolomites have low non?carbonate minerals including quartzs and feldspar minerals ranging from 0 to 4. 5% . The total REE content of dolomites are low, ranging from 1. 64 to 3. 24 μg / g with the depletion of LREEs and the enrichment of HREEs. The REE pat? terns of saddle?shape dolomites normalized by post?Archean Australian shale and seawater, respectively, show ob? vious positive Eu anomaly, indicating the involvement of hydrothermal fluid.