摘要
粤西黄岭岩组片麻状花岗质岩石属于云开地块的基底岩系（2600Ma～1700Ma），自下而上发育3种构造样式：下部透入性剪切变形带；中部平直均匀变形带；上部为揉皱带。应变分析表明．近水平分层剪切作用以及剪切应变带的向上迁移形成了上述不同构造样式。化学分析显示不同构造样式的花岗质岩石具有陆壳改造S型花岗岩特点。它们可能是形成于浅海一半深海的碎属原岩在原地或准原地剪切深熔的结果。剪切深熔深度约13km～15km，峰期变形在2000Ma～1700Ma。
Gneissic granitic rocks of the Huangling formation in western Guangdong are the basement metamorphic series (2600Ma -1700 Ma ). Three different structural styles are developed in these rocks:penetrating shear zone in the lower part,regular affine deformation zone in the middle part, and corrugation deformation zone in the upper part. Strain analysis shows that different structural styles are produced by the approximate horizontal shearing and its continuous upward migration. Chemical analysis reveals that gneissic granitic rocks possess the characteristics of crustal reformed S--type granite. In fact, these gneissic granitic rocks are resulted from autochthonous or near autochthonous shearing anatexis, whose protoliths are neritic-hypoabyssal clasolites. The depth of shearing anatexis is above 13km -15km,and the peak of shear deformation occurred on 2000Ma-1700Ma.
出处
《高校地质学报》
CAS
CSCD
1997年第4期429-437,共9页
Geological Journal of China Universities
基金
国家自然科学基金!49572100
广东省地矿局资助!"粤西高州岩群地质特征及金银多金属成矿关系"项目
关键词
花岗质岩石
化学分析
剪切深熔
片麻状岩石
granitic rocks, strain analysis, chemical analysis, layering shear anatexis, the Huangling formation, western Guangdong
