云开元古宙眼球状花岗岩Sm-Nd和Rb-Sr同位素体系定年及其动力学意义  

Dating of Sm Nd, Rb Sr isotopic systems and its dynamic singificance for the Proterozoic augen granite in Yunkai area.

作　　者：彭松柏[1] 张业明[1] 战明国[1] 陈富文[1] 邱瑞照[1] 

机构地区：[1]中国地质科学院宜昌地质矿产研究所,宜昌443003

出　　处：《岩石学报》2000年第1期99-105,共7页Acta Petrologica Sinica

基　　金：国家自然科学基金 (青年 )项目! (编号 495 0 2 0 36 );地质矿产部"九五"重点科技攻关项目! (编号 95 -0 2 -0 0 7)

摘　　要：对云开核部韧性 -流变剪切变形眼球状花岗岩石样品进行了全岩 Sm- Nd、Rb- Sr同位素年龄测定 ,获得 1414±6 8Ma的 Sm- Nd等时线和 490± 36 Ma的 Rb- Sr等时线年龄 ,它们分别代表这套花岗岩的形成时代和加里东期韧性 -流变剪切部分熔融构造热事件发生时间 ,表明云开地区不仅在加里东期发生造山运动 ,而且在中元古晚期发生了更为重要的构造—岩浆造山运动 。The same set of ductile rheologic shear deformational augen granite samples in the Yunkai uplifted area are measured by whole rock Sm Nd, Rb Sr isotopic dating system method, obtaining respectively 1414±68Ma for Sm Nd isochron age and 490±36Ma for Rb Sr isochron age. These ages are respectively interpreted as the time of the granitic rock formation and the time of the tectono thermal event of ductile rheologic shear partial melting in Caledonian, indicating that the orogeny not only took place in Caledonian, but also the more important tectono magmatic orogeny in the late Mesoproterozic Era and can be compared with the time of global Grenville orogeny.

关 键 词：元古宙 花岗岩 同位素体系定年 铲-钕 Ru-锶 

分 类 号：P588.121[天文地球—岩石学] P597.3[天文地球—地质学]