安徽沙溪式斑岩铜(金)矿床地质地球化学特征及成因分析  

On geological and geochemical features and cause of formation of porphyry copper gold deposit of Shaxi type in Lujiang County,Anhui

作　　者：姚孝德[1] 陈芳[1,2] 王利民[1] 孙明明[1] 

机构地区：[1]安徽省地质调查院,安徽合肥230001 [2]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《合肥工业大学学报（自然科学版）》2012年第10期1397-1404,1408,共9页Journal of Hefei University of Technology：Natural Science

基　　金：国土资源部地质大调查资助项目(1212010881616)

摘　　要：沙溪斑岩铜(金)矿床位于庐枞火山岩盆地西北外围,处于郯庐断裂带内部。矿体主要产于燕山期的石英闪长斑岩,次为黑云母石英闪长斑岩中。主要成矿期为岩浆期后热液期。蚀变分带自内向外:钠-更长石化带—硬石膏-黑云母-钾硅酸盐化带—钾硅酸盐青磐岩化叠加带—石英绢云母化带—青磐岩化带,主要工业矿体位于钾硅酸盐化带及其外侧。文章总结沙溪式斑岩铜(金)矿床地质地球化学特征,并对该类型铜(金)矿床的成因进行了探讨。The porphyry copper gold deposit of Shard type locates in northwest periphery of Luzong volcanic basin, inside of the Tanlu fault zone. The ore bodies mainly occur in quartz diorite of Yans- hanian, and then in biotite quartzdioriteporphyry. The main metallogenic period is the postmagmatic hydrothermal solution. The alteration zones from the inner to outward are successively the Na-oligo- clase zone, the anhydrite, biotite and K-silicate zone, the superimposed zone of K-silicate and propy- lite, the quartz-sericite zone, and the propylitic zone. The mainly industry ore bodies locate in the K- silicate zone and its outside. The geological and geochemical features of the porphyry copper gold de- posit of Shard type are summarized, and the cause of the formation of the deposit of this type is dis- cussed.

关 键 词：沙溪式斑岩铜(金)矿 地质地球化学特征 蚀变分带 矿床成因 庐江沙溪 

分 类 号：P612[天文地球—矿床学]