西藏拉桌坎铜矿床地质特征及找矿前景探讨  

Geological Characteristics and Ore Prospect of Lazhuokan Copper Deposit in Xizang Province

作　　者：段晋[1] 吴鹏飞[1] 

机构地区：[1]中国冶金地质总局第三地质勘查院,山西太原030002

出　　处：《黄金科学技术》2012年第3期31-34,共4页Gold Science and Technology

摘　　要：拉桌坎铜矿床位于冈底斯火山—岩浆弧带中段南缘冈底斯斑岩型铜（金）矿带冲江—达布Cu、Mo矿集区古近纪始新世金株村单元细—中粒黑云角闪石英闪长岩和结蒲林单元中粒黑云二长花岗岩的接触带,含矿岩石主要为二长花岗岩、石英闪长岩及少量的巨斑花岗岩,氧化矿品位0.55%－0.72%,深部原生矿品位0.62%－0.66%,矿石结构以自形、半自形和他形粒状为主,围岩蚀变主要为硅化和绿泥石化,矿化主要为孔雀石化和黄铜矿化。在化探扫面和查证的基础上,通过对矿床成矿地质背景和地球化学异常特征进行综合分析,认为NE向构造是容矿构造,控制着矿体的分布、产状和形态,铜矿床的形成与燕山晚期中酸性岩浆岩有密切的成因联系,Cu-1号主矿体有向北延伸的趋势,南部土壤地球化学测量异常有查证价值,应加大勘查力度,寻找新的矿体。Lazhuokan copper deposit is located in the transitional zone between Ezj and Ezjp in middle of gandise island-ore belt,and mainly ore-bearing rocks are monzogranite,quartz diorite and megaporphyritic.Oxidation ore grade 0.55%-0.72%,deep original mineral grade 0.62%-0.66%,ore structure to granular structure is granular texture, uncharged structure,metasomatic structure.Wall-rock alteration and mineralization mainly are malachite,chalcopy- rite,pyrite,chloride,chloritization.The copper deposit formation is realated to late yanshanian granites acidic magmatic rocks and the NE structure with mine structure,control the distribution of orebodies, formation.Research shows that Cu-1 orebody have a deepening trend and soil geochemical anomalies have check value in the southern.

关 键 词：铜矿床 地质特征 找矿前景 拉桌坎 西藏 

分 类 号：P618.41[天文地球—矿床学]