云南蒙自白牛厂银多金属矿床若干地质问题探讨  

Problems Pertaining to Bainiuchang Silver, Polymetallic Deposit in Mengzi Country, Yunan, China

作　　者：刘继顺[1] 张洪培[1] 方维萱[2] 郭军[1] 章霞林 

机构地区：[1]中南大学地学与环境工程学院,长沙410083 [2]有色金属矿产地质调查中心,北京100814 [3]蒙自矿冶有限责任公司,云南蒙自661100

出　　处：《中国工程科学》2005年第S1期238-244,251,共8页Strategic Study of CAE

基　　金：云南省省院省校科技合作资助项目(YX2004-6)

摘　　要：白牛厂大型、超大型银多金属矿床是滇东南锡多金属成矿带的重要组成部分,燕山晚期花岗岩是其主要控矿因素。花岗岩浆上侵过程中,使得上部沉积岩地层隆起,形成以寒武系地层为核的矿区短轴背斜构造;岩浆上隆作用还使矿区沉积岩层浅部产生一系列高角度阶梯状正断层,这些断层又进一步在下步收敛发育成一条规模较大的低角度剥离断层(F3)。已有工程揭示花岗质岩浆与寒武系碳酸盐、泥砂质岩石发生了较强的接触交代作用,并在接触带附近产生矽卡岩型铜锡多金属矿(化);在外带F3断层内形成银多金属矿体。主矿体(V1),实为一个较大的似层状矿体(白羊矿段上部)和若干个较小的扁豆状矿体(白羊矿段下部和穿心洞、对门山、阿尾矿段)构成的一个群体。白牛厂隐伏岩体接触带锡(铜)矿有良好的找矿前景;矿区西部茅山硐具备似层状锑矿和与热液作用有关脉状锑矿的形成条件。Bainiuchang deposit is one of three super-large polymetallic deposits in southeastern Yunnan.The mineralization is mainly connected with the lateYenshan period granitic intrusions including concealed granitic stocks and granite-porphyry veins.The bainiuchang short axis anticline and the fault F3 is made by the uplift of the granitic magma. F3 what major orebodies filled into is a gentle detachment fault. Contact metamorphism between granitic magma and sedimentary rocks, such as carbonate rocks and clastic rocks, occurred strongly in or near the contact area where skarn-type copper, tin and polymetallic ore bodies were formed in the same stage. Nevertheless silver, polymetallic ore bodies formed by the mineragenetic fluid filling into F3 and other faults, fissures are located at sedimentary rocks far from the granite. The mayor orebody V1 is a group of orebodies in fact. It is composed of a bigger stratoid orebody located in upper Baiyang and many small hyacinth bean-shaped orebodies located in in lower Baiyang, Chuanxindong, Duimenshan and Awei. Skarn-type copper, tin ore bodies are chief exploration aims in future.

关 键 词：白牛厂 银多金属 花岗岩 花岗斑岩 短轴背斜 剥离断层 锡 

分 类 号：P618.52[天文地球—矿床学]