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东南亚一个具有重要经济价值的宝石矿床位于越南北部安沛 (YenBay)地区的LucYen市附近。不同矿化的地质背景均位于红河剪切带南部的DayNuiConVoi变质带中。变质程度已达角闪岩相 ,变质温度 780°C ,变质压力 7kb。变质带主要由片麻岩和大理岩组成 ,伴有浅色岩和伟晶岩。至少已发现三种不同类型的原生宝石矿床 :(1)产于大理岩中的红宝石和尖晶石矿床 ,部分具有极高的宝石品质 ;(2 )产于片麻岩中的红宝石矿床 ,这类矿床以大的六方柱为特征 ;(3)产有电气石晶体的伟晶岩型矿化 ,有明显的颜色分带。类似的宝石矿床可能赋存于红河剪切带内适当的寄主岩石和围岩中 ,尤其是在中国的云南省内更有可能产出。
A gemstone deposit of significant economic value in Southeast Asia is located near LucYen, in the YenBay area of northern Vietnam. The different mineralized geological backgrounds are located in the DayNuiConVoi metamorphic belt in the south of the Honghe shear zone. Metamorphism has reached amphibole facies, metamorphic temperature 780 ° C, metamorphic pressure 7kb. Metamorphic belt is mainly composed of gneiss and marble, accompanied by light-colored rock and pegmatite. At least three different types of primary gem deposits have been identified: (1) ruby and spinel deposits produced in marble, partly with very high gem qualities; (2) ruby deposits produced in gneiss, which Class deposits are characterized by large hexagonal columns; (3) Pegmatite-type mineralization with tourmaline crystals with distinct color bands. Similar gem deposits may occur within the appropriate host rocks and surrounding rocks within the Honghe shear zone, and are more likely to be produced within Yunnan Province, China.