摘要
湘东北文家市地区仓溪岩群为一套高绿片岩—低角闪岩相的变质岩系，其Sm—Nd全岩等时线年龄：2 090±20 Ma, ∑Nd（T）=5.4 ；2 030±8 Ma, ∑Nd（T）=5.7 代表了原岩形成年龄；1 860±17 Ma, ∑Nd（T）=5.0 代表样品形成年龄。因此，将其形成时代定格为古元古代，属华南陆壳结晶基底的一部份。
Cangxi group complex at Wenjiashi area of eastnorthern Hunan is a metamorphic rock series of higher greenschist to lower amphibolite facies, its whole rock isochron age: 2090±20Ma,∑Nd(T)=5.4; 2030±8Ma,∑Nd(T)=5.7, it represents protolith's formed age; the age of 1860±17Ma,∑Nd(T)=5.0 represents the sample's formed one, therefore, the Cangxi group complex's formed age is paleoproterozoic era, and it belongs to the part of continental crust crystallization basement of southern China.
出处
《湖南地质》
2000年第3期155-158,共4页
Hunan Geology
关键词
仓溪岩群
湖南
钐-钕同位素年龄
Cangxi group complex
Sm/Nd isochron
Eastnorthern Hunan
