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笔者于1977年对挡阳山—安坡山登封群剖面的地层、岩性、构造等进行了观察和研究,首次发现登封群中有两个不整合存在;并将登封群地层由下至上划分为青羊沟组、郭家窑组、金家门组及老羊淘组。前者置下太古界,次者置上太古界,后两者置下元古界。登封群中两个不整合,即青羊沟组与郭家窑组之间不整合(下不整合)和郭家窑组与金家门组之间不整合(上不整合),其依据是:(1)不整合上下两套岩系地层岩石组合有明显差异;(2)上下两套地层岩石变质程度有较大差别。并由此引起斜长石结构状态及角闪石光学常数不同;(3)上下两套岩石混合岩化程度不同;(4)构造形态和构造格局明显不同;(5)青羊沟组上部有类古风化壳物质存在;(6)接触带处(不整合附近)岩脉发育;(7)上下地层在时代上有明显差异等。
The author observed and studied the strata, lithology and tectonics of the block block of Dengshan-Anpo Mountain in 1977. For the first time, two unconformities exist in Dengfeng Group. The strata of Dengfeng Group are composed of The bottom is divided into Qingyanggou group, Guojiayao group, Jinjiamen group and old sheep Amoy group. The former set the archaic world, the second place the archaic world, the latter two set Proterozoic. The two unconformities in Dengfeng Group, ie, unconformity (unconformity) between Qingyanggou Formation and Guojiayao Formation and unconformity (unconformity) between Guojiayao Formation and Jinjiamen Formation are based on the following: (1) there is a clear difference in rock assemblage between the two sets of unconformity rock strata; (2) there is a great difference in rock metamorphism between the upper and lower strata. Which led to the different states of plagioclase structure and the optical constants of amphibole; (3) the degree of rock formation was different between upper and lower rocks; (4) the structure and tectonic pattern were obviously different; (5) the upper part of Qingyanggou Formation Ancient weathering crust material exists; (6) dikes at the contact zone (near the unconformity); (7) there are obvious differences between the upper and lower strata in the age and so on.