论文部分内容阅读
嵩山地区的前震旦系至少可以分出两个不同的变质岩群:即早元古界嵩山群和晚太古界登封群.登封群现有同位素年龄为25.62±1.70亿年;是华北地台南沿最古老岩群之一.本文讨论登封群区域变质作用的压力类型及其变质历史.
The former Sinian in Songshan area can separate at least two different metamorphic groups: the Songliao Group of the Early Proterozoic and the Dengfeng Group of the Late Archean. The existing isotopic age of Dengfeng Group is 25.62 ± 170 million years; One of the oldest rock masses in Tainan, this paper discusses the pressure types and their metamorphic history of metamorphism in the area of Dengfeng Group.