摘要
本文以北大别地块中典型燕山期花岗岩——天堂寨、九资河花岗岩为例,研究了其黑云母、角闪石的矿物成分及岩石包体特征;并结合当前有关脱水熔融和含自由水体系的熔融实验岩石学成果,对花岗质岩浆的形成方式进行了讨论,认为天堂寨、九资河花岗岩是由含自由水体系的熔融作用形成的,含水流体的主要来源可能为南大别地块。
There are large areas of late Yanshanian granites in the Dabie erogenic belt, but the formation mode of the relevant granitic magma is still under discussion. Taking the typical Yanshaniangranites in the North Dabie block——the Tiantangzhai and Jiuzihe granites as examples, thewriters endeavour to discuss contain aspects of the formation mode of the granitic magma by studying the characteristics of the chemical compositions of biotite and hornblende of the granites and petrological features of enclaves in the intrusions, in the light of recent results of experimental petrology on dehydration melting and aquifer melting. It is suggested that:① Some biotites in the Tiantangzhai and Jiuzihe granites and their enclaves were residual minerals. ② Some of the hornblends could be new-born minerals, and others,residual ones.③ The banded bodies in granites were residuals of anatexis. ④The Tiantangzhai and Jiuzihe granites were formed by aquifer melting, and the South Dabie block could be the important source region of water.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2000年第1期63-71,共9页
Acta Geologica Sinica
基金
原地质矿产部基础研究项目"大别山1:5万九资河幅
张家嘴幅区域地质调查"基金
关键词
花岗岩
脱水
水体系
大别山造山带
花岗质岩浆
petrogenesis of granite
dehydration melting
aquifer melting
mineral charac- teristics
enclave characteristics
aquifer fluid
Dabie erogenic belt
