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青海省内中生代以前的变质岩,分布在昆仑区和祁连区,如下元古的金水口群,达肯大坂群,沙柳河群,湟源群,化隆群和党河群,还有一些变质岩划归下古生界。为确定其地质年代,多年来,省内外的地质工作者做了不少工作,积累了一批钾氩法年龄数据。这些数据分布散乱,有70%的数据在海西期和印支期内。本文搜集的数据列在表1内,采样位置见图1,其中也列入了一部分混合岩钾氩年龄数据。如何根据变质岩及混合岩的表观年龄,分析它们反映的地质意义,这是本文探讨的问题。
Qinghai Province before the Mesozoic metamorphic rocks, distributed in the Kunlun District and the Qilian District, the following Proterozoic Jinshuikou Group, Dakan Daban Group, Shaliu River Group, Suyuan Group, Hualong Group and Danghe Group, there are some Metamorphic rocks are assigned to the Paleozoic. Over the years, geologists both inside and outside the province have done a lot of work to determine the geologic age and have accumulated a batch of potassium-argon-age data. These data are scattered, with 70% of the data in the Hercynian and Indo-China periods. Data collected in this paper are listed in Table 1, the sampling location shown in Figure 1, which also included a part of mixed rock potassium-argon age data. According to the apparent ages of metamorphic rocks and migmatites, it is the issue discussed in this paper to analyze the geological significance they reflect.