根据对蓬莱宝石矿区新第三纪火山岩地质特征研究,划分出庙岭和蓬莱岭两个火山机构,4个火山岩相,5个喷发韵律,两个喷发旋回;将火山岩分为火山熔岩和火山碎屑岩两大类,火山岩属碱性系列岩石;火山岩人工重砂中均含有蓝宝石和红锆石,说明火山岩是宝石的成矿母岩,宝石矿物来自地幔,结晶后随玄武岩浆喷溢带到地表;火山岩经风化剥蚀后,其中的宝石被解脱出来经迁移富集形成残坡积和洪冲积宝石砂矿床. Based on the study of the geologic characteristics of the Neoproterozoic volcanic rocks in the Penglai gem mining area, two volcanic institutions, four volcanic facies and five eruptive volcanic facies in Miaoling and Penglailing are divided into two eruption cycles. The volcanic rocks are divided into volcanic lava and volcanic debris Volcanic rocks are alkaline series of rocks; sapphire and red zircon are contained in the volcanic artificial sand, indicating that volcanic rocks are the metallogenic mother rocks of gemstones, gem minerals from the mantle and crystallized with basalt magma spurt After the weathering and denudation of the volcanic rocks, the gems are liberated and migrate and enrich to form the residual slope sedimentary and flood alluvial gem sands deposits.