ZHANG Yong-san^1,2, HU Zhao-guo^1,2*, LIU Jing³, WANG Xiao-yu^1,2, ZHANG Bao-tao^1,2, LI Cheng-xi^1,2, HUA Bei^1,2, ZHANG Zhi-wu⁴, CAO Qi-chen^1,2, ZHAO Lei^1,2, ZHAO Xiao-bo^1,2, WEI Zheng-yu^1,2, XU Guang-dong^1,2

(1. Geological Exploration Institute of Shandong Zhengyuan, China Metallurgical Geology Bureau, Jinan 250014, China;
2. Institute of Mineral Resources Research，China Metallurgical Geology Bureau, Beijing 101300, China;
3. Exploration Research Institute of Shandong Coal Field Geology Bureau, Taian 271000, China;
4. China Metallurgical Geology Bureau, Beijing 100025, China)

Abstract: The Lincang area is located in the Lincang-Menghai Fe-Pb-Zn-Au-Ag-Sn-Sb-Ge-REE metallogenetic zone. Based on data of the stream sediment survey at scale of 1:50000 in the Lincang area, the geochemical characteristics of stream sediments have been made statistical analysis. Based on characteristics of element associations, geological background, and ore-forming conditions, we have delineated out ten comprehensive anomalies and four prospecting targets. Through the anomaly investigation, a certain amount of rare earth resources has been found. The relationship between geochemical anomalies of stream sediments and ion adsorption type REE deposits is summarized. The anomaly center can be inferred to the REE enriched part of the ore-forming parent rock, while the marginal part of anomaly could be the favorable supergene environment for the REE enrichment and mineralization. This work could be expected to provide useful information for the future exploration of the ion adsorption type REE deposit.

Keywords: Stream sediment; geochemical features; ion adsorption type REE deposit; Lincang area; Yunnan

ACTA MINERALOGICA SINICA Vol. 41, No.2, 2021, page 171-180