摘要
报道二元混合体系的端元Sm-Nd模式年龄的计算方法,即利用二元混合体系的Rb-Sr、Sm-Nd同位素分析结果,可以计算2个端元的Sm-Nd同位素组成,两端元在混源样品中的质量百分比,以及地壳残留时间。同时计算了广西花山复式花岗岩的端元模式年龄,结果显示该岩体的物质来源于2500Ma华南古陆壳和622Ma从亏损地幔分异出来的大洋地壳的混合物。
The paper presents a calculation method of end-member Sm-Nd model ages in a two-component mixing system, which can be used to calculate end-member Sm-Nd isotopic compositions, weight fractions of two end-members in any binary mixture and the model ages. Based on the method, the end-member model ages of Huashan composite granite body have been obtained. The results show that the materials of the granite body were derived from a mixing source at the Huanan basement formed at about 2500 Ma ago and an oceanic crust differentiated from DM with an age of about 622 Ma.
出处
《地质科学》
CAS
CSCD
北大核心
1993年第1期37-43,共7页
Chinese Journal of Geology(Scientia Geologica Sinica)
关键词
花岗岩
钐
钕
年龄
二元混合体系
End-member Sm-Nd model ages, Two-component mixing system, Basement, Huashan composite granite body
