Significance and Characteristics of REE Geochemistry in Calcite in the Eastern Ore Belt of the Baiyangping Poly-Metallic Metallogenic Province,Northwestern Yunnan Province,China

Calcite is a dominant gangue mineral in the eastern ore belt of Baiyangping poly-metallic metallogenic province.Geochemical characteristics of rare earth element(REE) of calcite from different ore bodies reveal that there are two types of REE distribution patterns: light rare earth element(LREE)-enriched and flat REE.The former represents that the REE behavior of calcite is that of inherited from pre-hydrothermal ore-forming hydrothermal features and the LREE was not apparently carried out during the mineralization process.The latter indicates that LREE was apparently brought out during the mineralization process;the REE content,relevant parameters and REE distribution patterns of calcite from different types of ore bodies change significantly,but they show continuous change tendency;combined with other isotope data and geological background of the mine,it is considered that ore-forming fluids were mainly hot brines and some mantle fluid participated in the ore forming process;The ore-forming conditions change from the reducing to oxidizing ones during the metallogenic process.