黔西南台地相区金矿构造蚀变体稀土元素特征

REE Characteristic of Structure Alteration Rocks in Tableland Lithofacies Area,Southwestern Guizhou Province

对贵州西南部台地相区泥堡金矿、戈塘金矿和水银洞金矿区构造蚀变体稀土元素特征研究发现,3个金矿区构造蚀变体稀土总量富集程度由高到低依次为泥堡金矿、戈塘金矿、水银洞金矿,且含黏土质和凝灰质成分的岩石,其稀土总量高,而硅质岩、硅化灰岩和灰岩稀土总量低,轻重稀土分馏程度水银洞最高,泥堡金矿构造蚀变体岩及矿石轻重稀土分馏程度高于围岩,戈塘金矿与水银洞金矿则相反。稀土配分曲线显示,构造蚀变体成矿流体可能存在多源性,但主要与峨眉山玄武岩相关。

The REE characteristics of structure alteration rocks of Nibao gold deposit,Getang gold deposit and Shuiyindong gold deposit in tableland lithofacies area are investigated.The result shows that,the degree of ∑ REE enrichment of structure alteration rocks from high to low are Nibao gold deposit,Getang gold deposit,and Shuiyindong gold deposit.The rocks containing sticky soil and lime coagulation has a higher ∑ REE,but silicalite,silicified limestone and limestone have a lower ∑ REE.The degree of LREE ＆ HREE fractionating in Shuiyindong gold deposit is highest,and LREE ＆ HREE fractionating of structure alteration rocks is higher than wall rocks in Nibao gold deposit,besides that,the phenomenon in Getang gold deposit and Shuiyindong gold deposit is opposite.The REE partition curve indicates that,the ore-forming fluid of structure alteration rocks may be multi-sourced,but mainly related to Emeishan basalt.