北大别单元变形岩体构造变形特征研究

大别造山带内出露面积最大的北大别单元侵入有大量的早白垩世花岗岩和基性-超基性岩体。本文通过野外和室内工作并利用石英C组构方法,查明北大别单元变形岩体的几何学和运动学特征,将其与片麻岩的特征对比研究。研究表明北大别单元变形岩体和片麻岩上盘均向NW运动,表明北大别单元发生了大规模的造山后构造变形。两者变形特征相同,表明变形岩体的变形过程发生于混合岩化过程中,本次研究工作也很好的验证了前人的观点。

Structural deformation features of deformed intrusion in the North Dabie Unit

There are a great number of early Cretaceous granitic and basic-ultrabasic intrusions in the largest area of outcrops of the North Dabie unit of the Dabie Mountain orogen.This paper,through field and desktop work using quartz c-axis fabric method,figured out geometric and kinematic features of deformed intrusions in the unit,made a comparative study of them with gneisses.There are indications that the deformed intrusions in the unit and hanging wall of gneisses all moved toward NW,a sign of large post-orogenic structural deformation in the unit.The two have same deformation features,suggesting deformation of the deformed intrusion in the process migmatization.This study well tested previous views on it.