新疆西地铜矿地球化学特征浅析  

Analysis of Geochemical Anomalies of the Xidi Copper Deposit,Xinjiang

作　　者：王晓伟[1,2] 王金荣[2] 杨春霞[2] 刘景显[1] 缪斌[1] 李鹏兵[1] 

机构地区：[1]甘肃省地矿局第三地质矿产勘查院,甘肃兰州730050 [2]兰州大学资源环境学院,甘肃兰州730000

出　　处：《西北地质》2011年第1期69-76,共8页Northwestern Geology

基　　金：国家自然科学基金重点项目(40534020);新疆国土资源厅项目(QD200509)资助

摘　　要：西地铜矿处于博格达造山带东段地球化学亚区内,受区域断裂的次级分枝断裂控制,地质构造复杂,岩浆岩发育。出露的地层主要有柳树沟组双峰式火山岩,地层走向受区域构造控制,呈北东东向分布,其间有大量辉绿岩侵入,以及较为强烈的岩浆晚期热液活动。化探异常以Cu、Pb、Zn、Au、Sb、As、Hg、Ti等元素组合为主,Cu、Pb、Zn、Ni、Cd、As等具有明显的富集,为本区的主要成矿元素和伴生指示元素。航磁异常总体上处在稍平缓的负异常中(△T为-120^+120nT),重力异常(幅值为-140×10-5^-170×10-5m/s2)由中部向南凸起,与航磁异常向北收窄相对应。辉绿岩与西地铜矿的生成具有密切的依赋关系,激电剖面显示存在两个高极化率异常区,表现出极其显著的高极化率、低电阻率的特点,表明下部存在隐伏铜矿体的可能。The Xidi Copper deposit is located in the sub-geochemical area of the eastern zone of Bogeda orogenic belt.Controlled by the secondary branched fault,this area is has a complicated geological structure and a well developed magmatic rock.The strata that lie in the area are mainly composed of bimodal volcanic rocks of the Liushugou Formation with the strike of strata being controlled by regional structure,mainly in the NEE direction.In addition,we can see a large amount of dolerite intrusion and an intensive hydrothermal activity of the late magmatic stage.The mainly geochemical anomalies are the combination of Cu,Pb,Zn,Au,Sb,As,Hg,Ti,of which the Cu,Pb,Zn,Ni,Cd,and As are obviously enriched.So they are the main ore-forming elements and indicator elements.The aeromagnetic anomaly is generally flat and slightly negative anomalies（△T=-120 to＋120nT）,and the gravity anomaly（amplitude-140 to-170×10-5m/s2） extrudes southward from the central bulge,which corresponds to the northward narrowing of the.corresponds aeromagnetic anomaly.Diabase is closely related the formation of copper deposit in Xidi.The IP profile shows that there are two high-profile polarization anomaly areas,showing a very prominent high polarization and a low electrical resistivity,indicating that the lower part is quite possible to have a concealed copper ore body.

关 键 词：西地铜矿 水系沉积物地球化学 岩石地球化学 

分 类 号：P595[天文地球—地球化学]