内蒙满洲里—新巴尔虎成矿集中区成矿演化、成矿模式与勘查模式

METALLOGENIC EVOLUTION,METALLOGENIC MODEL AND EXPLORATION MODEL OF THE MANZHOULI-XIN BARAG METALLOGENIC PROVINCE, INNER MONGOLIA

本区为具有超大型多金属资源潜力的成矿集中区。成矿受太平洋板块构造影响。矿床类型有斑岩型、次火山热液型、矽卡岩型,它们为具有成因联系的不同深度、不同地质环境下的产物,统称为斑岩成矿系列。总结了宏观、微观综合找矿评价标志,建立了勘查模式。

The study area, belonging to the Ergun Early Caledonian accretionary fold system, is a rnetallogenic province with potential supergiant polymetallic resources. The Upper Proterozoic-Lower Cambrian regional basement is the extension of the margin of the Siberian craton, and the metallization was intensely affected by the Pacific plate tectonics. The NE-trending Ergun-Hulun deep fault controlled strong Yanshanian volcanic-magmatic activity and the ore-forming process, whereas the NW-trending lateral tenso-shear or tensional faults controlled the formation of orefields. Ore deposits in this area are of porphyry type, subvolcanic hydrothermal type and skarn type. Being genetically-related products formed at different depths and in different environments, they may be regarded integratedly as a porphyry rnetallogenic series. 15 macroscopical and microscopical composite criteria for ore prospecting and assessment were summed up, an exploration model was advanced and, as a result, remarkable economic benefits have been achieved.