摘要
迷坝花岗岩位于甘肃东部的康县和陕西略阳交界处的迷坝一带。用Maniar的主元素判别法判定它为造山后花岗岩类(POG型)。角闪石和黑云母的^(40)Ar/^(39)Ar测年结果表明其侵位时代为239～229 Ma,是印支期岩浆活动的产物。在193.8Ma左右的早燕山期受到一次原因不明的热事件影响,导致了岩体中黑云母的氩同位素系统部分开放。
The Miba granite is located in the southeastern margin of Gansu province. It is revealed that this granite is of the POG type. The ^(40)Ar/^(39)Ar plateau ages of hornblende and biotite show that intrusion of the Miba granite took place about 239～229 Ma. At about 193. 8 Ma, a thermo-tectonic event affected this granite and resulted in the opening of the argon isotope system of biotite.
出处
《地质论评》
CAS
CSCD
北大核心
2002年第S1期110-114,共5页
Geological Review
基金
国家自然科学基金项目(编号49973003)
国家重点基础研究发展规划项目(编号2001CB409807)
国土资源部"十五"重点项目"中国东西部地貌边界带新构造运动及其对环境分异的影响"资助成果
