内蒙古东乌旗达亚纳地区地质矿产调查与成岩-成矿作用

1：5万矿产地质矿产调查表明，内蒙古东乌旗达亚纳地区的主要地层为下泥盆统泥鳅河组和上石炭统-下二叠统格根敖包组，其次为上侏罗统、新近系和第四系。泥鳅河组为浅海相沉积，形成于被动陆缘环境；格根敖包组形成于活动陆缘，与古亚洲洋向西伯利亚板块向北俯冲有关。研究区构造主要为走向北东的褶皱构造，断裂较发育，与成矿有关的构造主要为北东向和近南北向断裂。该地区发育2期岩浆作用和相关的多金属矿化。研究区多金属矿床发育，类型众多，成矿时间跨度长，形成构造背景多样。已发现的矿床类型有热液充填型铅锌银多金属矿床、构造蚀变岩型金矿、高中温热液型钨钼矿床（石英脉型黑钨矿），分别形成于板块俯冲、陆陆碰撞和造山后伸展垮塌背景。研究区长期的构造-岩浆作用为成矿提供了良好的地质条件，暗示该地区具有良好的找矿前景。

Geological and mineral resources survey as well as magmatism and mineralization in Dayana area of Dong Ujimqin Banner,Inner Mongolia

1:50000 geological and mineral survey shows that the main strata in Dayana area of Dong Ujimqin Banner in Inner Mongolia are the Early Devonian Niqiuhe Formation and the Late Carboniferous-Early Permian Gegenaobo Formation, followed by the Late Jurassic, Neogene and Quaternary strata. The Niqiuhe Formation is composed of shallow marine sediments, formed on the passive continental margin. The Gegenaobao Formation is related to the subduction of the Siberian plate. The structure of the study area is mainly composed of NE-striking fold structure. The faults in the study area occur in different groups, and the ore-controlling fault is mainly NE-and nearly NS-striking faults. There are two periods of magmatic intrusion and associated polymetallic mineralization in the study area. The formation of polymetallic deposits is characterized by various types, long mineralization time span and diverse tectonic settings. The ore deposits include hydrothermal-filled lead-zinc-silver polymetallic deposits, tectonic alteration rock type gold deposits, and high-medium-temperature hydrothermal tungsten-molybdenum deposits (wolframite-bearing quartz vein type). These deposits were formed in continental-arc magmatism caused by subduction of oceanic plate, continental-continental collision and post-orogenic stretched collapse background, respectively. The long-term tectonic-magmatism in the study area provides good geological conditions for mineralization, and hence the area has a good prospecting potential for polymetallic deposits.