Geochronology and Isotope Geochemistry of the Xiqiu Spilite-Keratophyre in Zhejiang Province,China  

作　　者：沈渭洲 凌洪飞 章邦桐 

机构地区：[1]Department of Earth Sciences,Nanjing University,Nanjing 210008

出　　处：《Chinese Journal Of Geochemistry》1993年第1期25-34,共10页中国地球化学学报

摘　　要：Spilite-keratophyre is a key member of the Shuangxiwu Group volcanic series in Zhejiang Province.Presented in this paper are the reliable Sm-Nd internal isochron age (1012±18Ma,∈Nd(T)=4.4±0.1) and whole-rock Rb -Sr isochron age (972±40Ma,Isr=0.70327±8) obtained for the first time by the authors.From the available Nd ,Sr and O isotope data in conjunction with the major and trace elements data it is suggested that the Xiqiu spilite-keratophyre is the product of island-arc volcanism during the late Middle Proterozoic.Spilite-keratophyre is a key member of the Shuangxiwu Group volcanic series in Zhejiang Province. Presented in this paper are the reliable Sm-Nd internal isochron age (1012±28 Ma, Nd(T)=44±0.1)and whole-rock Rb-Sr isochron age (972±40 Ma,I_(Sr)=0.70327±8)obtained for the first time by the authors. From the available Nd,Sr and O isotope data in conjunction with the major and trace elements data it is suggested that the Xiqiu spilite-keratophy re is the product of island-arc volcanism during the late Middle Proterozoic.

关 键 词：地球年代学 同位素 地球化学 浙江 细碧岩 角砾岩 

分 类 号：P588.34[天文地球—岩石学] P597[天文地球—地质学]