大王山动力变质带中蠕英石的特征和成因
来源期刊：中南大学学报(自然科学版)1991年第1期
论文作者：朱余德 何绍勋
文章页码：9 - 16
关键词：蠕英石; 糜棱片麻岩; 变形作用; 动力变质作用; 大王山动力变质带
Key words：myrmekite; mylonite-gneiss; dynamometamorphism; deformation; Dawangshan dynamometamorphic zone
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。
Abstract: 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 geometric 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 suggested that the myrmekite was formed as a product of the reaction of aqueous Na+ and Ca2+ on Kfeldspar in an amphibolite facies.
