摘要
文章根据大王山糜棱片麻岩中蠕英石的形态特征、分布规律、以及与岩石有限应变状态之间的几何关系等,说明蠕英石是在钾长石变形时形成且受到压应力方向的控制。文中对糜棱片麻岩中蠕英石的形成机理进行了探讨。
Although there may be many different geneses for myrmekite, it has been demonstrated that the myrmekite in Dawangshan granitic mylonite-gneiss (DGMG) was formed during the deformation of K-feldspar and was controlled by the normal stress, on account of its shapes, distribution, and the geo- metric relationship between myrmekite development on K-feldspar augen and the finite strain state of the rock. The formation mechanism of the myrmekite in DGMG has been discussed and it has been sug- gested that the myrmekite was formed as a product of the reaction of aqueous Na^+ and Ca^(2+) on K- feldspar in an amphibolite facies.
关键词
蠕英石
变质带
动力
麻岩
myrmekite
mylonite-gneiss
dynamometamorphism
deformation
Dawangshan dynamometamorphic zone
