摘要
燕山造山带形成于中生代,由于构造、火山活动,产生一系列断陷盆地,与隆起带相间出现,有等间距特点。张麻井大型铀钼矿床位于蔡家营—双脑包次级火山构造洼陷带内。主要为次流纹斑岩体控制,赋存于次流纹斑岩体顶部隐爆角砾岩中。在古太古代末基底发生强烈变质作用,成矿元素第一次富集。中生代的火山热液活动,成矿元素第二次富集。经多期次热液活动,在隐爆角砾岩部位形成富矿体。
Yanshan orogenic belt was formed in Mesozoic era, a series of faulted basins and uplift belt appear alternatively with the characteristics of equal interval because of tectonic, volcanic activity. The Zhangmajing large uranium - molybdenum deposit is loca- ted in secondary volcanic - tectonic depression belt of Caijiaying - Shuangnaobao, and is controlled by the subrhyolite - porphyry to host in cryptoexplosive breccia on top of subrhyolite - porphyry. The strong metamorphism happening in basement at late early - arche- an resulted in the first enrichment for ore - forming elements. The Mesozoic volcanic hydrothermal fluid activities resulted in the second one. So the oreshoots were formed in cryptoexplosive breccia by multiperiodic hydrothermal activities.
出处
《矿产勘查》
2012年第4期452-457,共6页
Mineral Exploration
关键词
燕山造山带
火山-沉积盆地
次流纹斑岩
隐爆角砾岩
Yanshan orogenic belt
volcanic -sedimentary basin
Sub- rhyolite- porphyry
cryptoexplosive breccia
