摘要
关于蠕状石的成因，许多地质学家提出各种不同的成因假说，多数人认为是交代生成的。根据蠕状石总是产在麻粒岩相变质岩和相应的混合岩中，并常出现于斜长石、正长石和石英的接触部位，含蠕状石的斜长石的折射率低于不含蠕状石的斜长石以及近年来花岗质岩石熔融实验研究获得的成果，笔者认为，蠕状石是在麻粒岩相变质条件下。
There exists much controversy concerning the genesis of myrmekite, and most geologists hold that myrmekite is of metasomatic origin. Myrmekite occurs invariably in granulite facies metamorphic rocks and corresponding migmatites and is often found among plagioclase, orthoc lase and quartz; the index of refraction of myrmekite bearing plagioclase is lower than that of plagioclase without myrmekite. Based on these facts and taking into account the achievements obtained in recent experimental research on melting of granite rocks, the author considers that myrmekite is eventually formed by eutectic crystallization in the process of cooling and crystallization after granitic melts are formed through anatexis under the condition of granulite facies metamorphism.
出处
《岩石矿物学杂志》
CAS
CSCD
北大核心
1997年第2期185-189,T001,共6页
Acta Petrologica et Mineralogica
关键词
蠕状石
麻粒岩相
初熔温度
麻粒岩
myrmekite
granulite facies
initial melting temperature
eutectic crystallization
