白马崖金矿床地质—地球化学特征及其成矿意义  

Study on Geology,Geochemistry and Its Metallogenic Significance of Baimaya Gold Deposit

作　　者：张志军[1] 龚庆杰[2] 刘辰曦 沈柳生 

机构地区：[1]天津华北地质勘查局,天津300181 [2]中国地质大学,北京100083 [3]华北地质勘查局五一四地质大队,河北承德067000

出　　处：《黄金科学技术》2014年第6期18-25,共8页Gold Science and Technology

基　　金：国家重点基础研究发展计划(973项目)"三江特提斯复合造山与成矿作用"(编号:2009CB421000)资助

摘　　要：白马崖金矿床处于康滇地轴北,是康定杂岩体内典型的石英脉—蚀变岩型金矿床。矿区出露古老的变质结晶杂岩基底,多呈刚性较强的块状岩石,岩性以斜长角闪岩、黄铁绢英岩、绢英片岩和构造片岩等为主。矿石矿物以石英为主,占90%以上,含少量绢云母、黄铁矿及其他硫化矿物。矿区断裂以近SN向脆—韧性剪切断裂为主,具多期次活动特点。通过矿床地球化学主量元素、稀土元素、硫同位素及流体包裹体的研究,白马崖金矿区围岩与蚀变岩在稀土元素配分曲线上均表现为缓右倾型;白马崖金矿床δ34S变化于-2.1‰-4.4‰之间,均值为1.6‰;含矿石英中流体包裹体以富含CO2为特征。白马崖金矿床断裂构造发育,深部岩浆流体带来成矿物质,并对围岩进行改造,富集成矿,对于进一步的研究和找矿工作具有一定的指导意义。The Baimaya gold deposit located in north of the Kang-Dian was typical quartz vein-altered rock type gold deposit in the Kangding complex rock mass.Old metamorphic crystalline complex mining area exposed basement and formed strong blocky rock rigidity mainly with amphibolite plagioclase,spun silk the schist as well as tectonic schist,etc.Key component of ore mineral was quartz that accounted for more than 90%,and contained a small amount of sericite,pyrite and other sulfide minerals.Fracture of mining area was seemed to be the SN direction with brittle-ductile shear fracture,which displayed various characteristics of the activity.Through studying the main elements of ore deposit geochemistry,rare earth elements,sulfur isotope,and fluid inclusion, obviously,surrounding rock and altered rock of the Baimaya gold deposit in rare earth elements distribution curve belonged to the right type.δ34S of the gold deposit varied between 2.1‰and 4.4‰ with the average of 1.6‰,and containing fluid inclusions in ore was characterized by rich CO2 The Baimaya gold deposit presented fault development with metallogenic substances brought by the deep magmatic fluid that could improve the surrounding rock and enrichment,which was of great significance for further research and the ore-prospecting work in the future.

关 键 词：地球化学 成矿流体 白马崖金矿 康定矿田 

分 类 号：P618.51[天文地球—矿床学]