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辽北清河镇群是由一套蛇绿岩组成,其中硅质岩与绿片岩和碳酸盐岩密切共生。在硅质岩中釆到了下古生代化石,从而否定了辽北“辽河群”的存在。根据硅质岩的化学成分关系图解和硅质岩的平均原子量计算,以及与硅质岩共生的岩石组合等分析, 笔者认为清河镇群中硅质岩形成于深海平原,硅质来源于地壳深部,通过生物比学作用而沉积,属于大洋板块内部远海沉积的硅质岩,随着大洋板块的俯冲作用被带到俯冲带中残留下来。
The Qinghezhen group in northern Liaoning is composed of a set of ophiolite, in which the chert is closely intergrowth with greenschist and carbonate rocks. The lower Paleozoic fossils have been found in the cherts, thus negating the existence of “Liaohe Group” in northern Liaoning. According to the chemical compositions of siliceous rocks and the calculation of average atomic weight of silicalite and the combination of rocks with syenite, we believe that the cherts in Qinghe Formation are formed in deep-sea plain and the siliceous rocks come from deep crust , Deposited through biotermatism, belongs to siliceous rocks deposited in the distant ocean of the oceanic plateau and is carried to the subduction zone by the subduction of the oceanic plate.