摘要
利用同源不同程度平衡部分熔融作用形成的两种原生岩浆岩的微量元素浓度，提出了一种定量反演原岩微量元素丰度的方法。反演前不需要做任何人为假设，为定量研究源区的微量元素地球化学提供了一个有力的手段。对汉诺坝新生代橄榄拉斑玄武岩和碱性玄武岩的成因及地幔源区特征作了讨论。反演结果显示本区地幔相对球粒陨石有过明显的ＲＥＥ富集过程，并且不同的ＲＥＥ富集程度存在显著的差异。
Using trace element concentrations of consanguineous primary magmas formed by different degrees of equilibrium partial melting,the author has put forward an inverse method for quantitatively calculating trace element abun-dances of source rocks.In the inverse calculation,there is no need to assume parameters such as C°,Dand F,so it provides an effective means for study-ing geochemical composition of the provenance.In addition,the paper has dealt with the genesis of the Cenozoic olivine tholeiites and alkali basalts and the characteristics of the upper mantle in Hannuoba area. The inverse results show that the upper mantle had obviously undergone enrichment of REE relative to chondrite before the melting process,with different rare earth elements experiencing obviously different degrees of enrichment.
出处
《岩石矿物学杂志》
CAS
CSCD
1994年第1期33-41,共9页
Acta Petrologica et Mineralogica
关键词
岩浆
定量反演
原岩
微量元素
丰度
equilibrium partial melting
quantitative inverse calculation
initial abundance of trace element
Hannuoba
