中亚地区南天山大型金矿带的地质特征、成矿模型和勘查准则
Geological characteristics, metallogenic model and criteria for exploration of the large South Tianshan gold metallogenic belt in Central Asia
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摘要: 概要介绍了中亚南天山大型金矿带的构造环境、地质特征和分布特点。中亚南天山是世界重要的金成矿带,其中发育有一系列世界级矿床。在该带中,除了剪切带型(造山型)金矿外,还有夕卡岩型、细网脉型以及爆破角砾岩型。成矿围岩是前寒武纪和早古生代浅变质岩系,成矿与二叠纪花岗质岩石密切相关,成矿流体以富CO2为特征,与矿化有关的围岩蚀变强烈发育,通常以Au,Ag,Sb,Te,As,W和Bi元素组合为地球化学找矿标志。Abstract: This paper briefly introduces the tectonic environment ,geological characteristics and distribu tion of the large South Tianshan metallogenic ore belt in Central Asia.The South Tianshan of Cen tral Asia is an important gold metallogenic belt in the world,in which there occur a number of world-class mineral deposits.In the belt,in addition to shear zone type(orogenic)gold deposits,there are also skarn,vein-let-stockwork and cryptoexplosion breccia types.Country rocks are Precambrian and Early Paleozoic low-grade metamorphic series and mineralization is closely related to Permian granitic rocks.Ore fluids are rich in CO 2 and wall-rock alteration related to mineralization is strong.Generally the assemblage of the ele-ments Au ,Ag ,Sb,Te ,As ,W and Bi is the ore guide.