论文部分内容阅读
恒山灰色片麻岩中变基性岩的微量锆石U－Pb方法测定结果为：（1850±2）Ma，应代表吕梁期变基性岩墙（脉）的形成时代。三个由不同时代变基性岩构成的Sm－Nd全岩混合等时线年龄结果没有地质意义，不能作为恒山灰色片麻岩中变基性岩包体的形成时代。
The trace zircon U-Pb dating of the metamorphic rocks in the Hengshan gray gneisses is (1850 ± 2) Ma, which should represent the age of the formation of the dyke (veins) of the Lüliang phase. The results of the Sm-Nd whole-rock mixed isochron age, consisting of three metamorphic rocks of different ages, are of no geological significance and can not be used as the forming age of metamorphic petrofacies in the Hengshan gneiss.