招菜地区花岗岩钾长石变斑晶特征及其形成

CHARACTERISTICS AND C ENESIS OF POTASH FELDSPAR IN GRANITES IN THE ZHAOYUAN- YEXIAN AREA

摘要:

本文论述了招菜地区与金矿关系密切的花岗岩,尤其是郭家岭斑状花岗岩中,发育大量的钾长石斑晶。从钾长石斑晶的化学成分、光性特征、与其他矿物的交代关系以及被其包裹的先成矿物与基质的相似性,表明钾长石斑晶是在花岗岩化过程中的钾化阶段,由成岩溶液对先成岩石的渗透—扩散交代而成。

Abstract:

Potash feldspar porphyroblasts occur in large quantity in the granite closely related to the gold ore deposits in the Zhaoyuan-Yexian area, especially in the Guojialing porphyritic granite. Based on the study of the chemistry, optical properties of the potash foldsparporphyroblasts, their replacement relationship with other minerals, and similarities to the pre-existing minerals enclosed in the porphyroblasts and the matrices of granites, it is suggested that the potash feldspar porphyroblasts wore formed b...