内蒙古赤峰塔西地区地质特征成矿规律与矿产预测

Geological Characteristics Metallogenic Regularity and Mineral Resources Predication of Taxi Region in Chifeng of Inner Mongolia

通过开展1∶5万区域矿产调查,对内蒙古赤峰市塔西地区的地质特征进行了综合研究,并总结了成矿规律,圈定了找矿靶区。该区处于天山-内蒙中部-兴安地槽褶皱区,内蒙古中部地槽褶皱系,苏尼特右旗晚华力西地槽褶皱带,哲斯-林西复向斜的西北翼,大兴安岭多金属成矿带之西南侧。区内主要出露二叠纪及侏罗纪地层;区域构造运动强烈,以脆性断裂为主,褶皱次之,主构造线为NE向;侵入岩多岩株状NE向展布,以形成于晚侏罗世和早白垩世的酸性、中酸性花岗岩为主。区内以银、铜、铅、锌、锡、钨、铁等金属矿产为主,划分为华力西晚期、印支期、燕山早期和燕山晚期等4个成矿期,以燕山晚期矿化作用最强,以充填交代为主。通过综合分析,将研究区划分二级成矿预测区4处,三级成矿预测区4处,为该区找矿工作指明了方向。

Through carrying out regional mineral resources survey with the scale of 1∶50000,geological characteristics Taxi area in Chifeng of Inner Mongolia has been studied comprehensively.Metallogenic regularities have been summarized,and the prospecting target areas have been circled.This area is located in Tianshan—central Inner Mongolia—Xingan geosyncline area,central geosyncline fold system in Inner Mongolia,late Variscan geosyncline fold belt in west Sunite banner,the northwest edge of Linxi syncline,and southwest edge of Da Hinggan Mountains polymetallic metallogenic belt.Permian and Jurassic strata mainly developed in this area.Regional tectonic movement is strong.It is mainly composed of brittle fractures,accompanying with folds.The main tectonic line has the trend of NE.The intrusive rocks distributed mainly with the trend of NE.It is mainly composed of late Jurassic and early Cretaceous acid and medium-acid granites.Main mental resources in this area are silver,copper,lead,zinc,tin,tungsten,iron and other metals.It can be divided into four mineralization periods,they are late Variscan period,Indosinian and early Yanshanian and late Yanshanian.Mineralization in late Yanshan period is the strongest with filling repalcement.Through comprehensive analysis,the study area has been divided into 4 metallogenic predication areas with the second level,and 4 metallogenic predictation areas with the third level.It will guide the direction of prospecting work in this area.