对法库地区“辽河群”的新认识

A FURTHER COGNITION ON LIAOHE GROUP IN FAKU AREA

经近几年区域地质调查研究发现：法库地区原辽河群变质岩系，实际上是由变质的安山岩、英安岩、碎屑岩、碳酸盐岩及变形的花岗岩组成。岩石遭到强烈的再造作用，特别是糜棱岩化作用，并且大部分地层在花岗岩中呈捕虏体存在。经野外宏观、室内微观的综合研究以及邻区对比，认为该地区变质地层具有槽区古生界的普遍特征，尤其是在原辽河群大石桥组大理岩中采到海百合茎化石。已可确认：原辽河群这套变质岩系，除了变形的花岗岩之外，均属地槽型古生代地层。

Through the regional geological exploration and research in recent years,it has been found that the former metamorphic rock series of Liaohe Group in Faku area actually is consisted of metamorphic andesite, dacite,clastic rock,carbonate rock and deformed granite, which all the rocks has experienced strong reconstruction, especially mylonitization , and in granite most strata in the form of xenolithes. Through the comprehensive research in outdoor microscrope and in indoor macroscope,the correlation with the adjacent area,it was considered that the metamorphic strata in the studied area had the common feaures of Paleozoic erathem in geosyncline,especially the fact that crinoidal fossils collected from marble of Dashiqiao Formation, Liaohe Group could indicate that the metamorphic rock series of the former Liaohe Group except deformed granite belonged to geosyncline type Paleozoic strata.