摘要
湖北罗田黄土岭长英片麻岩是与紫苏石榴黑云片麻岩共生的浅色片麻岩，成分上近于Ａ型花岗岩．受到浅混合岩化，钾交代现象显著．在斜长石与钾长石新成体接触处有清楚的交代净边结构，背散射电子探针分析表明，净边成分为钠长石（Ａｂ８９～９７）．在净边结构上，发现叠加倒转双晶．净边结构产生于长英片麻岩部分熔融的高温条件下。
The quartzofeldspathic gneiss is a leucocratic rock compositionally akin to A-type granite associated with hypersthene garnet biotite gneiss in Huangtuling,Luotian County in Dabieshan area.It is a metatexitic rock with prominant K-metasomatism.On the grain boundary of the plagioclase in contact with K-feldspar neosomes,the corrosion-reaction margin (clean margin) is remarkable.Microprobe-analyses of the margin verify the composition of albite (Ab 89～97 ).Occasionally,inversion of polysynthetic twinning is developed cutting through the clean albitic margin.The clean margin of plagioclase occurs under high temperature during the partial melting of the quartzofeldspathic gneiss,which must be genetically related to the formation of the A-type granite during the post orogenic uplift.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1996年第5期513-518,共6页
Earth Science-Journal of China University of Geosciences
基金
国家自然科学基金
地质矿产部壳幔体系组成
物质交换及动力学开放研究实验室基金
关键词
混合岩
A型花岗岩
斜长石
净边结构
倒转双晶
K-metasomatism,A-type granite,clean margin texture,inverse polysynthetic twinning,Dabieshan.
