摘要
庐山变质核杂岩构造主要由拆离断层、玉琼山背形和五里正断层组成。它形成于中生代末—新生代初，是地区性伸展作用的产物，伸展拆离方位为北东东向。拆离断层上盘为中元古代彭山群浅变质的浊积岩和细碧－石英角斑岩，其下部发育褶迭层并形成动力变质带。拆离断层下盘为早前寒武纪星子群结晶岩系、前震旦纪片麻状花岗岩和燕山期花岗岩，其顶部形成初糜棱岩带，且部分地段迭加着脆性变形和退化变质作用。
The structure of the metamorphic nucleus complex in Lushan is mainly composed of de-tachment fault,Yuqiongshan antiform and wulizheng fault.It formed owing to the regional stretchingproces of the end of Mesozoic Era the beginning of cenozoic Era,the direction of the extension de- tachment is the east of Eastnorth.The upper wall of the extensional fault is the shallow metamorphicturbldite and spilite-quartz reratophyre of Pengshan group in the middle Proterozoic era. The lowerdeveloped fold layer and formed kinematic metamorphic zone. The lower wall of the detachment fault is the crystalline rock system of the early Precambrian Xinzi Group,the gneissoid granite of the Pre-cambrian and granite in Yansanian period,the top formed the primary mylonite zone and part sectionwas over printed by the brittle deformation and retrograde metamorphism.
出处
《华东地质学院学报》
1994年第1期11-17,共7页
Journal of East China Geological Institute
关键词
变质核
杂岩构造
岩石构造
structure of the metamorphic nucleus complex
extensional process
detachment fault
Lushan
