吕梁-晋北地区晚前寒武纪镁铁质岩墙群侵位方式的磁组构证据  

MAGNETIC FABRIC EVIDENCE OF THE STYLE OF EMPLACEMENT OF LATE PRECAMBR1AN MAFIC DYKE SWARMS IN THE LUL1ANG-NORTHERN SHANXI REGION,NORTH CHINA

作　　者：张臣[1] 侯贵廷[1] 钱祥麟[1] 

机构地区：[1]北京大学地质学系

出　　处：《地质论评》1994年第3期245-251,共7页Geological Review

基　　金：高等学校博士学科点专项科研基金

摘　　要：华北克拉通区内的吕梁-晋北地区广泛发育晚前寒武纪镁铁质岩墙群。该地区近EW向和NW-NNW向岩墙的磁组构测量结果表明,岩墙群磁各向异性与岩墙侵位的关系密切,磁化率的长轴能指示其岩浆侵位的流向。该区的岩墙群的岩浆源位于东侧的燕辽拗拉槽处,岩浆沿岩墙走向以一定仰角由ESE(或E)朝NW-NNW(或W)向流动,具板内裂谷模式。Late Precambrian mafic dyke swarms are developed extensively in the Luliang-northern Shanxi region of the North China craton. Measurements of the magnetic fabrics of the nearly E-W and NW-NNW sets of dykes in the region indicate that the magnetic anisotropy of the dyke swarms is closely related to the emplacement of dykes. The longest axis of the magnetic susceptibility can indicate the flow direction of dyke emplacement. The magma source is beleived to be located in the Yanliao aulacogen of the craton. The magma flowed upward at a certain angle along the trend of the dykes from ESE(or E)to NW-NNW (or W).

关 键 词：岩墙群 磁组构 侵位方式 镁铁质岩 

分 类 号：P588.242[天文地球—岩石学]