【摘要】 方解石是芙蓉锡矿田重要的脉石矿物。根据芙蓉矿田白蜡水矿区和狗头岭矿区不同产状(云英岩型、蚀变岩体型和构造蚀变带-矽卡岩型)矿石中方解石稀土元素地球化学特征研究表明:两矿区成矿期热液方解石具有两种稀土模式,LREE(轻稀土元素)富集型和相对平坦型。其中,蚀变岩体型方解石所具有的相对平坦型稀土模式代表了LREE带出后残余热液的稀土模式特征,而云英岩型和构造蚀变带—矽卡岩型方解石的LREE富集型稀土模式与骑田岭新鲜花岗岩类似,表明成矿过程中没有LREE明显带出的迹象,残余热液继承了岩浆期后热液的特征。成矿流体来源于骑田岭花岗岩岩浆期后热液。更多还原

【Abstract】 Calcite is the dominant gangue mineral in the Furong tin-polymetallic deposit.The calcites associated with greisen type ore,altered rock type ore and skarn type ore from Bailashui and Goutouling mineral district,are characterized by two types of REE distribution patterns,LREE-enriched pattern and flat REE pattern.LREE-enriched pattern of calcites accompanying greisen type ore and skarn type ore are very similar to those of Qitianling granite.It implied that this REE behavior of calcite inherited from the characteristics of LREE-enriched magmatic hydrothermal fluid derived from the Qitianling granite plution.The calcites associated with altered rock type ore with flat REE distribution patterns indicate LREE of the hydrothermal fluid extracted during the alteration or mineralization process.Therefore,the data of calcites suggest a magmatic source for the or-forming hydrothermal fluid.更多还原