摘要
通过对鲁东胶西南地区早前寒武纪地层、岩浆岩、变质作用的分析得出:太古宙岩浆活动强烈,地层呈表壳岩残存,构造运动以塑性变形为主;元古宙时岩浆活动微弱,地层分布广泛,构造运动以脆性变形为主;变质作用呈角闪麻粒岩相—角闪岩的相互转换,且皆与构造运动相关呈现不均一性,整个胶西南地区在历经2800,2500,1800Ma的三次陆壳固化后形成完整的结晶基底。
Based on the analysis of the early pre-Cambrian strata, magmatic rocks and metamorphism in the southeast area of Jiaodong in east Shandong, some conclusions were obtained. Magmatic activity was powerful during Archaean era, and the strata only left a few parts as supracrustal rocks and plastic deformation was the main tectonic movement. During Proterozoic era, magmatic activity got weak, and the strata distributed widely and fragile deformation became the main tectonic movement. The metamorphism transformed from homblendite-granulite facies to hornblendite facies. Both facies were relative to the tectonic movement but their distribution not homogeneity. Through the three times of crust solidification in 2 800 Ma, 2 500Ma and 1 800Ma, the whole area of southwestern Jiaodong formed a perfect crystal basement.
出处
《华南地质与矿产》
CAS
1999年第1期38-45,共8页
Geology and Mineral Resources of South China
基金
国土资源部专项培训基金
关键词
早前寒武纪
古构造运动
地层
岩浆岩
变质作用
early pre-Cambrian crust the southwest area of Jiaodong east Shandong
