摘要
新疆和田县大红柳滩509道班西锂铍稀有金属矿是近年发现的超大型锂多金属矿床。为了研究矿区花岗伟晶岩的岩浆分异演化过程,建立岩浆演化各阶段和稀有金属成矿的矿物学指标,笔者利用电子探针原位主量元素分析和自动矿物分析系统(TIMA)对矿区内伟晶岩和地层中的石榴子石展开研究。结果表明,矿区内花岗伟晶岩中的石榴子石为岩浆成因,属于铁铝榴石-锰铝榴石固溶体系列,变质砂岩中的石榴子石为变质成因。区内伟晶岩中的石榴子石随着岩浆演化程度的增加而逐渐富Mn,高Mn含量石榴子石(MnO>22.5%)可以作为该地区高分异矿化伟晶岩的标志。因电气石结晶分异的作用下使得石榴子呈现从核心到边缘Mn含量增加、Fe含量降低的现象。综合研究表明伟晶岩的演化顺序为白云母花岗伟晶岩-白云母电气石花岗伟晶岩-贫矿(锂)伟晶岩。
The West Kunlun Orogenic Belt of the 509 Daobaxi deposit is a super-large Li-Be rare metal discovered in recent years.In order to study the magmatic differentiation and evolution process of granite pegmatites in the mining area,and establish the mineralogical indexes of each stage of magmatic evolution and rare metal min-eralization,this paper used electron probe in-situ principal element analysis and automatic mineral analysis sys-tem(TIMA)to study various types of garnet in the mining area.The results show that the garnet in the granite-pegmatite in the mining area is of magmatic origin,belonging to the almandine-spessartine solid-solution,and the garnet in the metamorphic sandstone is of metamorphic origin.The garnet in the area is gradually enriched with the deepening of magma evolution.High-Mn garnet(MnO>22.5%)can serve as a marker for highly dif-ferentiated mineralised pegmatites in the region.Due to tourmaline crystal differentiation,Mn content increases and Fe content decreases from core to edge of pomegranate.The evolutionary sequence of pegmatite is Mus-covite granite-pegmatite,Muscovite tourmaline granite-pegmatite and ore-bearing pegmatite.
作者
王利波
王威
姚宗全
李永
陈川
王涵
WANG Libo;WANG Wei;YAO Zongquan;LI Yong;CHEN Chuan;WANG Han(College of Geology and Mining Engineering,Xinjiang University,China University,Urumqi 830047,Xinjiang,China;Key Laboratory of Central Asia Geological and Mineral Information Integration Autonomous Region,Urumqi 830047,Xinjiang,China;The Research Center Resource and Environment of Xinjiang,Urumqi 830000,Xinjiang,China;Institute of Geology and Mineral Resources,Xinjiang Nonferrous Geological Exploration Bureau,Urumqi 830099,Xinjiang,China)
出处
《西北地质》
北大核心
2025年第4期223-233,共11页
Northwestern Geology
基金
国家重点研发计划“西昆仑-阿尔金锂等稀有金属矿综合三维模型应用示范”(2021YFC2901904-3)
新疆维吾尔自治区天山英才项目“吐哈探区深层海相石炭系火山岩成藏机理与高效发现技术”(2023TSYCY0002)联合资助。
