摘要
所研究的玄武岩包括拉斑玄武岩、碱性玄武岩、苦橄粗玄岩和钾质玄武岩。主元素和微量元素的组成变化表明，中国东部玄武岩既是不同深度地幔部分熔融的产物，又经历了岩浆结晶分异作用。强不相容元素比值的变化特征显然与岩石圈地幔交代作用有关。软流圈地幔的上涌并导致上覆不均一的岩石圈地幔的部分熔融是形成中国东部新生代玄武岩的主要机制。
Cenozoic basalts from eastern China including tholeiitic, alkalic, picritetrachy and potassic basalts were studied in this paper. The variation of both major element and trace element abundances shows that these Cenozoic basalts were derived from the partial melting of mantle at various depths and subsequent fractional crystallization. Variable ratios of highly imcompatible elements might be related to lithospheric mantle metasomatism. It appears that the upwelling of asthenospheric magma and the melting of overlying heterogeneous mantle lithosphere generate the Cenozoic basalts of eastern China.
出处
《地球化学》
CSCD
北大核心
1995年第1期1-19,共19页
Geochimica
关键词
玄武岩
地幔源区
主元素
微量元素
岩石成因论
Cenozoic basalts
mantle source
major elements
trace elements
eastern China
