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吉林省通化市北部光华乡一带 ,发育有一套由变质基性席状岩墙、变质气孔状玄武岩、黑云变粒岩、大理岩、含榴二云片岩、变质流纹岩为组合的中—浅变质岩系。该套岩系岩石组合、变质程度均有别于龙岗古陆内的太古宙上壳岩。具有陆内裂谷环境下形成的双峰式火山岩建造特征。依据区域地层对比、岩石组合特征、同位素年龄资料 ,与周围侵入岩的相互关系 ,结合本地区地壳演化历史综合分析认为 ,其形成时代当属早元古宙 ,建立光华岩群。
Jilin Province, Tonghua City, northern Guanghua Township, the development of a set of metamorphic basaltic dykes, metamorphic pore-like basalts, biotite granulites, marble, garnet-bearing two cloud schist, metamorphic rhyolite for the combination of - Shallow metamorphic rocks. The mafic rock assemblage and metamorphism are different from the Archean upper crust in Longgang ancient land. It has the bimodal volcanic rock formation features formed in the continental rift environment. Based on the correlation of regional stratigraphic correlation, rock assemblage characteristics, isotopic age data and the relationship with surrounding intrusive rocks, a comprehensive analysis of the crustal evolution history in this area shows that the formation age belonged to the Early Proterozoic and established Guanghua Rock Group.