中国东部燕山期岩石圈_软流圈系统大灾变与成矿环境

THE YANSHANIAN LITHOSPHERE_ASTHENOSPHERE CATASTROPHE AND METALLOGENIC ENVIRONMENT IN EAST CHINA

中国东部在燕山期发生了岩石圈＿软流圈系统（ＬＡＳ） 大灾变事件， 并识别出被扰动的ＬＡＳ的两种类型， 即在挤压造山环境下的岩石圈巨大减薄与巨大增厚作用； 它们分别对应相关的安第斯型和海西型成矿作用。大量的新生、热地幔物质和再活化的热的下地壳物质取代、加热和注入冷的岩石圈和地壳是燕山期成矿大爆发的基因和基本的深部环境。再活化和活动的岩石圈尺度的不连续带是成矿带的良好储矿空间。巨大的岩浆＿流体＿成矿系统是形成巨大矿集区的必需。从深部成矿环境来看，

This paper points out that catastrophe of the lithosphere_asthenosphere system (LAS) took place in East China during the Yanshanian movement. Two types of the Yanshanian disturbed LAS and metallogenesis in East China are recognized, viz., great lithosphere thinning and thickening in the compressional orogenic environment and related Andes_type and Hercynian type metallogenesis. Great amounts of juvenile and hot mantle materials and reactivated hot lower curstal materials replacing, heating and injecting into the cold lithosphere and curst are believed to have been a fundamental sources and a basic deep environment for the Yanshanian metallogenic explosion. Reactivated and active discontinuities on the lithosphere scale is considered to be the main ore_hosting space of the metallogenic zone. A large magma_fluid_metallogenic system is necessary for the formation of the large cluster area of ore deposits. East China is believed to have large potential for prospecting of ore deposits in terms of the metallogenic environment.