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辽西地区中元古代变质表壳岩包括石英岩、千枚岩 -片岩、大理岩及细粒长英质片麻岩和少量阳起石片岩 ,为中酸性火山活动及钙碱性玄武岩活动之后的海进型沉积旋回 ,显示出一套较为连续的火山 -沉积系列。变质深成岩以斜长花岗质片麻岩为主体。根据同位素测年、微古植物化石分析及与地层的接触关系等 ,厘定它们为中元古代产物。在中元古代该区经历了大陆边缘岛弧的形成、发展过程
The Mesoproterozoic metamorphic crust rocks in western Liaoning include quartzite, phyllite-schist, marble, fine-grained feldspathic gneiss and a small amount of pedrocolitic schist, which are intermediate-acidic volcanic activities and calc-alkaline basaltic rocks The sea-type sedimentary cycle, showing a more continuous volcano - sedimentary series. Metamorphic pluton to plagiogranite gneiss as the main body. According to the dating of isotopes, analysis of microfossils of ancient plants and the contact with the strata, etc., they are determined to be the Proterozoic products. In the area of Mesoproterozoic, the island experienced the formation and development of continental arc at the continental margin