摘要
西藏弄如日金矿位于青藏高原南部冈底斯-喜马拉雅构造区的南冈底斯复合构造岩浆带东段,矿体严格受北北东向断层控制,主要产于上侏罗-下白垩统林布宗组的红柱石角岩、长英角岩和硅化砂岩及晚渐新世二长花岗斑岩中。金矿化围岩蚀变包括硅化、黄铁矿化、水云母-绢云母化、钠长石化、高岭土化、碳酸盐化等。地球化学具有Au-As-Sb-Hg元素组合的异常,对金矿的勘探具有很好的指示意义。全面详细总结弄如日金矿成矿地质特征,结合野外详细的地质调查认为弄如日金矿床成因为斑岩期后热液与地下水混合的中低温热液型,工业类型属破碎蚀变岩型,大量断裂破碎带的发育,进一步证实弄如日金矿具有较大的找矿潜力。同时,提出了本地区该类型金矿的找矿方向及在冈底斯成矿带上的找矿意义。
The Longruri gold deposit is located in the south of the Gangdise-Himalaya metallogenic belts,Tibetan plateau.The mineralization was primarily controlled by NNE-trending faults.These ores are mainly distributed in the Oligocene adamellite rocks and upper Jurassic-lower Cretaceous Linbuzong formation rocks which consist of andalusite hornfels,felsic hornfels,and silicated rocks and sandstone.The related gold mineralization alterations include silication,pyritization,hydromica sericitization,albitization,kaolinization,and carbonization.The Au-As-Sb-Hg geochemical anomalies are the indicator of the gold mineralization distribution.Based on geological features,we suggest that the Longruri gold deposit is a typical epithermal gold deposit which has a major potential of exploration for gold.Meanwhile we propose the exploration direction for this type of gold deposits in this area and its significance to the work in the Gangdese metallogenic belt.
出处
《地质与勘探》
CAS
CSCD
北大核心
2010年第2期207-213,共7页
Geology and Exploration
基金
国家科技支撑计划课题(2006BAB01A01
2006BAB01A04
2006BAB01A05)联合资助
关键词
弄如日
金矿
地质特征
找矿方向
Longruri
gold deposit
geological characteristics
exploration direction
