【摘要】 本文从历史沿革、回龙湾强应变带的发现、原岩建造和沉积环境、变质作用、时代等方面对比研究了二郎坪群和石界河群的区别,认为应坚持二郎坪群的最初含意,并赞同建立石界河群。二郎坪群为新元古代—奥陶纪的火山岩—沉积岩建造,石界河群为晚古生代的泥砂质建造。它们作为北秦岭裂陷的中期和晚期形成物,对认识北秦岭造山带的演化史,有非常重要的意义。更多还原

【Abstract】 In terms of the evolution history, the discovery of the strain band in the Erlangping Group, the primary sedimentary formatin, sedimentary environments, metamorphism and ages , this paper studied the differences between the Erlangping and the Shijiehe groups. The authors consider that the broad sense of the Erlangping group should be sticked to. So. they agree to build up the Erlangping group. The narrow sense of the Erlangping group belongs to the volcanic-sedimentary formation of the Neoproterozoic - ordovician periods. The Shijiehe group is the mud-sand sedimentary formation of the late Palaeozoic era. The narrow senses of the Erlangping and Shijiehe groups in the North Qinling Rift are formed during the middle and late periods separately. These groups are the important recrds of the evolution of the North Qinling orogenic belt. Key words Erlangping group, Shijiehe group, Xixia of Henan province, North Qinling Rift, Orogenic belt更多还原