青海拉脊山地区位于青海省东部,大地构造属南祁连褶皱带,按地质力学观点处于中新生代形成的祁吕山字型前弧的西侧南翼,该地区广泛发育着寒武-奥陶系的中基性火山熔岩。由于地处青海东部,长期以来不少单位进行了大量地质和岩矿鉴定工作。广大地质人员和鉴定人员在长期的工作实践中,经过对比研究,把该区广泛发育的中基性火山熔岩的主要类型确定为安山岩,次为安山玄武岩、玄武岩、英安岩等。如第二区测队,近两年来在拉脊 The Lajishan area of ​​Qinghai is located in the eastern part of Qinghai Province. The geotectonic zone is a South Qilian fold belt. According to the geomechanical view, it lies in the south wing of the western front of the Qilu-Shan-type anterior arc formed by the Meso-Cenozoic. The Cambrian- Pottery-based volcano lava. Due to its location in the east of Qinghai, many units have conducted a large number of geological and rock mineral identification work for a long time. In the long-term working practice, the majority of geologists and appraisers identified the major types of volcanic lava widely developed in the area as andesite, followed by An-basalt, basalt and dacite. Such as the second district team, the last two years in the ridge