【摘要】 方解石是白秧坪多金属矿集区东矿带矿石中的主要脉石矿物。不同产状矿体中方解石的REE地球化学特征研究表明,3个矿段成矿期方解石具有2种稀土模式:LREE(轻稀土元素)富集型和相对平坦型;前者表明成矿过程中没有LREE明显带出的迹象,残余热液继承了前期成矿热液的特征,而后者表明成矿过程中有LREE带出。不同类型矿体方解石中REE含量、有关参数和稀土配分模式等均变化较大,但在地球化学特征上具有连续变化规律,显示为同源不同阶段的产物。方解石为热液成因方解石,结合其他同位素的资料和矿区的地质背景,得出成矿流体以大气降水与围岩反应形成的热卤水为主、深部流体参与其成矿作用的观点。成矿过程中,由早到晚,成矿环境表现为还原向氧化环境变化。更多还原

【Abstract】 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.更多还原