论文部分内容阅读
利用电子探针对胶北荆山群泥质低压麻粒岩开展了深入的独居石定年研究, 通过建立环带结构独居石的年龄分布图和非环带结构独居石的 PbO-ThO2*年龄等时线图, 确定了胶北荆山群的多阶段变质演化年龄, 即早期进变质作用达到角闪岩相的年龄为 1720±15 Ma, 峰期麻粒岩相变质作用年龄为1687±16 Ma, 峰期后抬升冷却阶段年龄为 1568±15 Ma, 从而为探讨胶北地块的热构造演化提供了有利的年代学制约.
Using electron microprobe, we conducted in-depth study of monazite dating of argillaceous low-pressure granulite in Jiaoanshan Group of Jiaohsi North. By establishing the age distribution of monazite in the zonal structure and the PbO-ThO2 * age isochron The figure shows the multi-stage metamorphic evolution ages of Jingshan Group in the Jiaobei area, ie, the age of the amphibolite facies in the early metamorphism reaches 1720 ± 15 Ma and the age of the granulite facies metamorphism in the peak period is 1687 ± 16 Ma. After the peak period The age of the uplifting and cooling stage is 1568 ± 15 Ma, which provides favorable geochronological constraints for exploring the thermal structural evolution in the Jiaobei block.