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本文利用电子显微镜研究了江苏东海榴辉岩中的角闪石和陕西鱼洞子群变质角闪岩中的角闪石微结构,发现这些角闪石存在位错和其他缺陷。在榴辉岩的角闪石中,位错为刃型位错,刃位错线平行c轴,B矢量值为9,矢量方向有两类:大多数//[100],少数//b轴。位错露头在a~*-b~*面上线型排列成位错壁。位错壁两侧的亚晶粒有微小的取向偏差,形成2—5°的小角晶界,且刃位错露头间隔越密,晶体扭曲越大,小角晶界也越大。在含水条件下角闪石通过交代反应,逐步增宽pyribole链体,在剪切带内生成滑石结构,并不断把角闪石颗粒细粒化。
In this paper, we studied the amphiboles in the East China Sea eclogites and hornblende amphiboles from the Yudong-Qiangzi metamorphic amphibole in eastern China by means of electron microscopy and found that there exist dislocations and other defects in these amphiboles. In the amphibole of the eclogite, the dislocations are edge dislocations, the dislocation line of the edge is parallel to the c-axis, the value of B vector is 9 and there are two kinds of vector directions: most // [100], few // b axis. Dislocation outcrop a ~ * -b ~ * surface linear arrangement of dislocation wall. The subgrains on both sides of the dislocation wall have slight misorientations, forming small angle grain boundaries of 2-5 °, and the more dense the dislocations of the edge dislocations, the larger the crystal distortion and the larger the small angle grain boundaries. The amphiboles, through hydroponics, progressively broaden the pyribole chain, generate talc structures within the shear band, and continue to fine hornblende particles.