摘要
分布于陕西省眉县斜峪关地区的斜峪关岩群与分布在豫陕交界的二朗坪群,处于古元古代隆起北侧的同一构造带上不同位置的构造块体,二者时代一般被限定在523～948 Ma。但二者岩石组合存在着明显的差别,构造环境具有一定差异。斜峪关岩群以中性火山岩为主,夹中酸性火山岩及少量基性火山岩。二朗坪群在陕豫交界发育拉斑玄武岩系列和钙碱性系列基性岩,且伴生较多的中酸性火山岩;南阳盆地以东,为基性和酸性火山岩,并以拉斑玄武质系列岩石为主,伴有相当数量的钠质火山岩,具类似的双模式岩套。前者岩石组合清楚、建造特征相近,时代归属和构造意义明确,具有一定的区域分布性,根据定名优先原则,建议重新启用斜峪关岩群。重新启用斜峪关岩群对研究与分析北秦岭岩石构造格架及地质演化史具有重要地质意义。
The Xieyuguan Rock Group is distributed in the Xieyuguan area in Meixian of Shaanxi province and the Erlangping Group in the border zone between Shaanxi and Henan Provinces. Both the groups are situated in different tectonic masses, which are attributed to the same tectonic zone at the north side of Paleoproterozoie upheaval, and they are dated the same period between 523 - 948 Ma. They have prominent differences in rock association and tectonic settings. The Xieyuguan Rock Group should be very important in research and probing into the tectonic framework and the geology evolution of lithology in the northern Qinling.
出处
《陕西地质》
2012年第1期1-5,共5页
Geology of Shaanxi
关键词
陕西省眉县
斜峪关岩群
二朗坪群
古元古代
火山岩
Meixian of Shaanxi
Xieynguan Rock Group
Erlangping Group
Paleoproterozoic
volcanic rocks
