新疆西南天山金矿分布、类型和成矿条件

DISTRIBUTION AND METALLOGENIC CONDITIONS OF GOLD DEPOSITS IN SOUTHWEST TIANSHAN MOUNTAINS

西南天山是我国重要金和有色金属矿产远景区。金矿点众多，具成带分布特点，主要分布在下古生界以及海西期花岗岩分布区，分岩浆水热、火山水热、沉积－变质（改造）、变质水热、地下热卤水溶滤、风化壳和砂金７种类型，其中最主要的是变质水热型和地下热卤水溶滤型。金成矿条件表明，金矿化具明显的层控性和时控性，主要赋矿层位有元古宇、志留系、泥盆系和石炭系，主成矿期为石炭纪—二叠纪；金成矿作用与岩浆活动有关；金矿在空间分布上明显受区域重大构造—热事件控制，多产于韧剪带、断裂破碎带、节理裂隙带、片理化带、接触带等构造部位。

Southwest Tianshan is an important prospect of gold and nonferous metals in China,which has a number of ore occurrences. with the characteristics of belted distribution.The gold is mainly distributed in Lower Paleozoic and Hercynian granites.There are magma hydrothermal type,volcano hydrothermal type,sedimentary metamorphic type,metamorphic hydrothermal type.underground thermal brine lixiviation type,gossan and placer gold, of which the main types are metamorphic hydrothemal type and underground thermal brine lixiviation type .By summarizing the gold metallogenic conditions,it indicates that the gold mineralization has the characteristics of strata bound and chron bound.The main hosting horizones are Proterozoic,Silurian,Devonian and Carboniferous,the main metallogenic stage is Carboniferous Permian.The gold metallogenesis is related to the magmatic activities.The spatial distribution of gold deposits is obviously controlled by the great regional tectonic and thermal events.They are often procduced in ductile zones,kata rocks of fault,fractures of joint,schistositized belts as well as the contact belts.