摘要
近年来 1∶5万和 1∶25万区域地质调查研究发现,湘东北地区原中元古代冷家溪群实际上包含了时代更老的不同构造环境的物质建造,其应予以解体,分离出基本无序的变质沉积 -火山岩系,使之与区域上中元古代冷家溪群原有的基本属性能对比。根据对这些变质沉积 -火山岩系的岩石组合、岩石学、同位素年代学等研究,初步厘定出“涧溪冲岩群”、“仓溪岩群”和“连云山杂岩”3个群级构造-岩石地层单位,属绿片岩 -角闪岩相,其原岩形成地质时代是新太古-古元古代。
According to research of rock assemblages,petrology and isotopic dating as well as recent (1∶50000) and 1∶250000 geological survey,the so-called Lengjiaxi Group can be subdivided into Mesoproterozoic Lengjiaxi Group consisting of metamorphic sedimentary rocks and volcanic rocks,Neo-Archean-Paleoproterozoic Jianxichong Group,Canxi Group and Lianyunshan complex.The Jianxichong Group and Canxi Group endured green schist facies to hornblende facies metamorphism.
出处
《华南地质与矿产》
CAS
2005年第1期47-53,71,共8页
Geology and Mineral Resources of South China
基金
中国地调局区域地质调查项目(200013000107).
关键词
变质沉积-火山岩系
冷家溪群
中元古代
湘东北
metamorphic sedimentary rocks and volcanic rocks
Lengjiaxi Group
Mesoproterozoic
Northeast Hunan
