摘要
济南辉长岩体的Rb Sr全岩 矿物参考等时线年龄为 144± 2 5Ma ,线性差的原因可能是该岩体来自于锶、钕同位素初始比值不均一的源区 ,结晶时处于同位素不平衡状态。钕同位素初始值εNd(t)值为 - 9.0 8～13.0 5 ,表明该岩体的源区为富集性质的地幔 ,并且表现出不均一性 ,εNd(t) 87Sr 86Sr(t)关系显示出源区满足DMM、EMⅠ和EMⅡ的三元混合关系。
The whole rock-mineral reference isochron of Jinan gabbro intrusion is 144±25 Ma. The isotopic data scattering of Jinan gabbro on the isochron diagram suggests that the Sr and Nd isotopic systems of the rock were unequilibrated during its crystallization. The ε Nd(t) values are from -9.08 to -13.05, indicating that the source of Jinan gabbro intrusion is enriched-mantle and have a heterogeneous characteristic. The ε Nd(t) vs. 87Sr/ 86Sr(t) plot shows that the Jinan gabbro resulted from the mixture of DMM、EMⅠand EMⅡ.
出处
《矿物岩石地球化学通报》
CAS
CSCD
2001年第4期302-305,共4页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
原地质矿产部重点科技项目 ( 95 0 110 2 3 2 )
博士学科点基金资助项目 ( 980 4910 7)
