内蒙正镶白旗岩体中长石的初步研究

PRELIMINARY STUDY ON FELDSPER OF ZHENGXIANGBAI QI ROCK BODY IN INNER MONGOLIA

本文初步研究了内蒙正镶白旗岩体中有代表性的流纹质碎斑熔岩、花岗斑岩、石英二长斑岩中长石的结构状态、光学性质、成分与岩体的形成环境。结果表明从石英二长斑岩、花岗斑岩到流纹质碎斑熔岩,长石的有序度、三斜度由高到底;折射率、光轴角由大变小;形成温度由低变高,长石的成分由富钙到富钠的变化。

This paper is a preliminary study of the structural states, optical properties and compositions of the feldspars in rhyolitic porphyroclastic lava, granite-porphyry and quartzmonzonite porphyry which are typical rocks in Zhengxiangbai qi rock body of Inner Mongolia. It also is a discussion on the forming enviorment of the rockbody. From quartz-monzoniteporphyry, granite-porphyry to rhyolitic porphyroclastic lava, the order degree and triclinity of the feldspars change from high to low, the refraction indexes and axial angles from large to small, the forming temperatures from low to high and the compositions of feldspar are from calcium-rich state to potassium-sodiumrich state.