二元混合体系的端元Sm-Nd模式年龄计算方法  

CALCULATION METHOD OF END-MEMBER Sm-Nd MODEL AGES IN A TWO COMPONENT MIXING SYSTEM

作　　者：杨晓松[1] 胡家杰[1] 

机构地区：[1]中国地质大学地质系,武汉430074

出　　处：《地质科学》1993年第1期37-43,共7页Chinese Journal of Geology(Scientia Geologica Sinica)

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.

关 键 词：花岗岩 钐 钕 年龄 二元混合体系 

分 类 号：P588.121[天文地球—岩石学]