摘要
江西南部寻邬县的白面石盆地,分布一套菖蒲组基性玄武岩与酸性流纹岩互层的火山岩组合。其Rb-Sr等时线年龄:玄武岩为173Ma,流纹岩为165Ma,说明这是一套中侏罗世双峰式火山岩。通过进一步的同位素研究,玄武岩具有高ε_(Sr)及近于零的ε_(Nd)值,显示其明显受到地壳物质的混染;流纹岩则以其高ε_(Sr)及低ε_(Nd)值,表现为地壳成因。
In the southern Jiangxi Province, there are a number of Mesozoic volcanic basins along the Sannan-Xunwu tectonic belt, such as the Dongkeng-Linjiang basin and the Baimianshi-Changpu basin. In the basins are well developed Mid-Jurassic bimodal volcanics. It is revealed by the isotopic characteristics of Rb-Sr and Sm-Nd that the basalt in the volcanics has high εSr and εNd values, indicating obvious contamination by crustal materials, while the rhyolite appears to be a melted product of the upper crust for its high εsr and low εNd values.
出处
《地质论评》
CAS
CSCD
北大核心
2000年第2期186-189,共4页
Geological Review
基金
国家自然科学基金 (编号49772110)
关键词
白面石盆地
双峰式
火山岩
同位素
钐-钕
Baimianshi basin
bimodal volcanics
isotope
southern Jiangxi Province
