THE METAMORPHIC ROCK SERIES IN JINING AREA, INNER MONGOLIA: Protolith restoration and ore-prospecting guide
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摘要: 集宁地区位于内蒙古中部，阴山山脉东段，隶属华北地台北缘内蒙台隆凉城断隆.基底主要出露太古宙中深变质岩系，以大土城隐伏深断裂为界，断裂以南为集宁岩群分布区，以北为乌拉山岩群分布区.集宁岩群变质岩系的原岩主要由泥质长石砂岩、泥质粉砂岩及碳酸盐岩组成，伴有基性岩体侵入；乌拉山岩群变质岩系的原岩是由长石砂岩、泥质长石砂岩、泥质砂岩、泥质粉砂岩夹安山岩、安山质凝灰岩及碳酸盐岩等组成的一套巨厚的火山-沉积建造.通过1：5万袁家房子等四幅矿调，对集宁地区的变质岩系的地球化学特征及含矿性进行了调查研究，综合分析认为变质岩系为本区的主要赋矿岩层，为本区找矿指出了方向.Abstract: Jining area, situated in the eastern section of the Yinshanian mountain range in central Inner Mongolia, tectonically belongs to the Liangcheng fault uplift of Inner Mongolia anteclise on the northern margin of North China platform. The basement outcrops are predominantly Archean medium-high metamorphosed rocks, which are divided by the Datucheng hidden deep fault into the Jining rock group in south and the Wulashan rock group in north. The protolith of the Jining rock group is composed of mainly argillaceous arkose, argillaceous siltstone and carbonate rock associated with basic intrusions. The protolith of the Wulashan rock group is a suite of volcanic-sedimentary formation in huge thickness, consisting of arkose, argillaceous arkose, argillaceous sandstone and argillaceous siltstone, intercalated with andesite, andesitic tuff and carbonatite. Based on four sheets of 1:50000 scale mineral survey in Jining area, the geochemistry and ore content of the metamorphic rock series are studied. It is concluded that the metamorphic rocks are the major host of ores in this area.
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