摘要
根据岩石学特征,本文全岩样品被分为三组。各组岩石具有不同的微量元素含量和锶氧同位素组成,还呈现不同的变异特征。各类岩石的Rb,Ba,Nb,Sr等元素含量明显高于原始地幔值。这些特征与其他已发表的资料均反映出超镁铁岩和铬铁岩有地幔残余成因和岩浆结晶成因,以及上涌地幔经历过多期部分熔融和大陆岩石圈中壳幔物质混染作用。
The samples in this paper can be divided into three groups according to their petroiogical features. They show different microelement contents and strontium-oxygen isotope abundances,and different variational modeles from each other. Rb,Ba,Nb,Sr contents of all samples are higher than that of primary mantle. The above-mentioned features and other published data suggest that the ultramafites and chromitites belong to mantle-residue genesis and magmatic-cumulate genesis,and complex events of upwelling mantle plume about multiperiod partial meltings and crustal-mantle contaminations in continental lithosphere.
出处
《矿物岩石》
CAS
CSCD
1992年第4期88-95,共8页
Mineralogy and Petrology
基金
国家自然科学基金(4840006)
关键词
超基性岩
铬铁岩
微量元素
锶
氧
geochemistry
petrogenesis
crustal-mantle contamination
mantle plume
