REE Daughter Minerals Trapped in Fluid Inclusions in the Giant Bayan Obo REE-Nb-Fe Deposit,Inner Mongolia,China
作者单位：School of Applied GeologyCurtin University of TechnologyGPO Box U 1987Perth 6001Australia
会议名称：《中国科学院地质与地球物理研究所2004学术年会》
会议日期：2004年
学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程]
基 金：supported by The National Natural Science Foundation of China (Project No.49972036) supported by the Key Programs of Chinese Academy of Sciences(Grant No.KZCX1-07)
摘 要：The Bayan Obo REE-Nb-Fe deposit hosts the world’s largest known REE *** deposit consists of replacement bodies hosted in dolomite marble and of magnetite,REE fluorocarbonates, fluorite aegirine,amphibole,calcite,and *** types of fluid inclusions have been recognized: two-phase aqueous liquid-vapor(L-V),two-to three-phase CO(C),and three-phase liquid-vapor-solid (L-V-S) *** measurements indicate that the carbonic phase in C inclusions is nearly pure *** heating experiments,hexagonal or irregular-shaped daughter minerals in L-V-S inclusions complete dissolution at temperatures of 420 480℃and recrystallize again at about 400 320℃.These show that daughter minerals in multiphase inclusions in mineralizing veins were crystallized from trapped fluids,and are real daughter ***-carbonates,halite,sylvite,barite, calcite,and pyroxene(?) have been identified on the basis of crystal habit(microscopic and SEM) and EDX *** comparison with Raman spectra of reference REE-carbonate mineral crystals,hexagonal or irregular-shaped daughter minerals in L-V-S inclusions might be cebaite and ***. presence of REE-carbonates as an abundant solid in the ore-forming veins shows that the original ore-forming fluids were very rich in REE,and therefore had the potential to produce economic REE ores at Bayan Obo.