摘要
木落稀土矿床位于印度-亚洲陆陆碰撞带之东部转换带,是四川冕宁-德昌稀土矿带的重要组成部分,其成矿与喜山期岩浆碳酸岩关系密切。本文在详细的矿床地质研究基础上,通过矿床中主要稀土矿物氟碳铈矿中流体包裹体岩相学、显微测温分析、包裹体成分的 LRM 分析和包裹体中子矿物相的 SEM/EDS 分析等,对与稀土矿化有关的成矿流体的特征、演化及稀土迁移与沉淀的机制进行了讨论。结果表明,与稀土成矿有关的流体为富 CO_2、H_2、K^+、Na^+和 SO_4^(2-)的中高温、高压超临界流体。超临界流体对稀土的迁移起到重要作用,温度、压力降低造成的超临界流体中 CO_2相与水溶液相的分离是造成稀土矿物沉淀的主要机制。
Himalayan Mianning-Dechang REE belt, one of the most important ore-belt in China, is located in west margin of Yangtze craton in East India-Asia collision zone. Muluo REE deposit is one important part of them. It located at the northerm part of this belt. The Muluo REE deposit situated tectonically located on the northern Jinpingshan Mountains, a Cenozoic intracontinental orogenic belt in southwestern China. Based on petrography, microthermometry, LRM and SEM/EDS analysis of fluid inclusions in bastnaesite, this paper discussed the characteristics, the evolution of ore-forming fluid and REE precipitation mechanism. It is concluded that REE is transited in CO2 , H2 and SO4 rich supercritical fluid, decreasing of temperature and pressure, phase-separating is the dominated mechanism for REE precipitation,
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第3期555-561,共7页
Acta Petrologica Sinica
基金
国家自然科学基金(编号:40573035,40603012)
国家重点基础研究发展规划项目(编号:2002CG412610)联合资助
