海南蓬莱地区火山岩地质特征及其与蓝宝石矿床形成的关系  

CHARACTERISTICS OF VOLCANIC ROCKS AND RELATIONSHIP WITH THE SAPPHIRE DEPOSIT, PENGLAI, HAINAN

作　　者：黄香定[1] 陈哲培[1] 钟盛中 

机构地区：[1]海南省地质矿产勘查开发局,海口570206

出　　处：《华南地质与矿产》1997年第3期39-45,共7页Geology and Mineral Resources of South China

摘　　要：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.Two volcanic mechanisms of Miaoling and Penglailing were recognized according to the research on the characteristics of Neogene volcanic rocks in Penglai sapphire deposit. The volcanic rocks are alkali series and can be divided into lava and volcaniclastic rock with four facies in five linits of rhythm during two eruptive cycles. There are heavy minerals of sapphire and jacinth in those rocks and they are the sources of gemstones. It is considered that the gemstones were derived from the mantle with the magma of basalt after they crystallized. While basalt was weathering, gemstones were separated from it, and formed gemstone deposit in eluvial and alluvial sediments.

关 键 词：火山岩 宝石矿床 蓝宝石矿床 地质特征 

分 类 号：P588.14[天文地球—岩石学] P619.281[天文地球—地质学]