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中国东秦岭北部前寒武纪区,在地质构造和变质作用研究的基础上建立了地层层序,主要的结论是: 1)较老的变质岩群(秦岭群)是秦岭一带最老的,年龄老于1800m·y;
Based on the study of geological structure and metamorphism, the Precambrian region in the northern part of East Qinling in China established the sequence of stratigraphy. The main conclusions are: 1) The older metamorphic group (Qinling Group) is the oldest in the Qinling Mountains, Old age 1800m · y;