中条山变质岩系的层序和年代讨论

涑水杂岩的归属和宋家山群的地层对比是中条山区变质岩系的两大基本问题。经野外对各套岩系的变形变质期次、接触关系性质的重新认识，初步查明流水杂岩是绛县运动及其后热事件的产物；宋家山群可能比绛县群更老，或两者为同期异相。将各套岩系中的不同样品按不同测试方法、地质背景、测年数据进行对比后，得出担山石群、中条山群、绛县群／宋家山群、虎坪杂岩５套岩系的年龄上限依次为１．８５Ｇａ、２．０Ｇａ、２．５Ｇａ、２．８Ｇａ。

THE SEQUENCE AND AGE OF THE ZHONGTIAOSHAN METAMORPHIC ROCK SERIES

The assignment of the Sushui complex and stratigraphic correlation of the Songjiashan Groupare two basic problems on the metamorphic rock series in the Zhongtiao Mountains. Proceedingfrom a new understanding of the phases of deformation- metamorphism and nature of contact rela-tionships of various rock series through field surveys, it has been ascertained preliminarily thatthe Sushui complex is the product of the Jiangxian movement and its subsequent thermal eventand that the Songjiashan Group might be older than the Jiangxian Group or both might be syn-chronous but heteropic. Comparison of different samples from various rock series in terms of dif-ferent measuring means,geological settings and age data suggests that the upper limits of the agesof the Danshanshi Group,Zhongtiaoshan Group,Jiangxian Group/Songjiashan Group and HupingGroup are 1.5,2.0,2. 5 and 2. 8 Ga respectively.