胶东早元古代荆山群变质作用演化样式及其构造环境探讨  

The Style of Metamorphic Evolution of Early Proterozoic Jingshan Group in Eastern Shandong Province and its Tectonic Environment

作　　者：董永胜[1] 王微[2] 

机构地区：[1]长春科技大学地球科学学院,长春130061 [2]长春科技大学测试中心,长春130026

出　　处：《世界地质》1998年第3期1-8,共8页World Geology

摘　　要：胶东地区发育大面积的早无古代变质地层──荆山群。该套岩系经历了三期五个阶段的变质作用，峰期温压条件为T＝700～750℃，p＝0．50～0．60GPa，达角闪麻拉岩相。变质作用pTt轨迹为逆时针形式，反映早元古代陆缘壳内裂陷带的闭合过程。The widespread early Proterozoic metamorphic sequence, the jingshanGroup, has experienced five periods of metamorphism in three episodes. The temperatureand pressure of its peak stage in amphibole granulite facies is around 700～750℃, and0.50～0.60 GPa. The metamorphic pTt path is counter clockwise, which reflects theenclosing process of an ensialic rifted belt on the continental margin during earlyProterozoic.

关 键 词：PTT轨迹 构造环境 荆山群 变质作用 早元古代 

分 类 号：P588.3[天文地球—岩石学] P534.3[天文地球—地质学]