南秦岭勉—略—带分布着一套展旦亚界的细碧-角斑质火山岩系,其出露总厚度大于3500米,分布范围约1万平方公里。主要由细碧质、少量角斑质、石英角斑质火山熔岩及火山碎屑岩组成,并夹有硅质板岩、泥质板岩、千枚岩、片岩等海相沉积岩层及灰岩透镜体。钠质辉绿岩等次火山相岩脉(或岩床)常与该火山岩系伴生。在此火山岩系中还广泛 South Qinling Mian - slightly - with distribution of a set of sub-Pitt Dan - sub-pyroBrite volcanic rock series, the total exposed thickness of more than 3500 meters, the distribution of about 10,000 square kilometers. Mainly by the fine bikini, a small amount of horny, quartz horny plagioclase volcano lava and volcaniclastic composition, and sandwiched with siliceous slate, shale, phyllite, schist and other marine sedimentary rock and limestone Lens body. Subvolcanic dikes (or bedrock), such as sodium-type diabase, are often associated with this volcanic series. In this volcanic rock series is also extensive