江西赣州淘锡坑钨矿床稀土地球化学研究

REE Geochemistry of the Taoxikeng Tungsten Deposit in Ganzhou,Jiangxi Province

淘锡坑钨矿床是赣南地区典型的云英岩型黑钨矿矿床。本文重点研究震旦系浅变质砂板岩围岩、成矿花岗岩及含矿云英岩、石英脉稀土元素地球化学特征,通过对岩石化学组成、稀土元素配分模式及特征值LREE/HREE-REE、δEu-LREE/HREE相关性的分析,对比现代海相、陆相沉积物稀土元素组成特点,确定震旦系浅变质砂板岩原岩为浅海相陆源沉积岩;成矿花岗岩属于陆壳熔融成因花岗岩;含矿云英岩、石英脉及成矿物质属于岩浆期后热液产物。

The Taoxikeng tungsten deposit, located in southern Jiangxi Province, is a typical greisen-type wolframite deposit. This paper focuses on REE geochemistry of the Sinian sand-slates, ore-forming granites, mineralization greisen veins and the quartz veins in this deposit. Based on analyses of petrochemical compositions, REE distribution patterns and characteristic values （including EREE-LREE/HREE and ~Eu-LREE /HREE）, comparisons with REE compositions of modern marine and terrestrial sediments, we infer that protoliths of the Sinian sand-slates are shallow marine terrlgenous sedimentary rocks, and the genesis of ore-forming granites is related to melting of the continental crust. The mineralization greisen veins, quartz veins and oreforming materials are all the products of postmagmatism hydrothermal fluid.