青海省都兰县哈图稀土矿床地质特征及成矿模式  

Geological characteristics and mineralization pattern of Hatu Rare Earth Deposit in Dulan County,Qinghai Province

作　　者：张先福 吴树宽 赵立志 许皓 Zhang Xianfu;Wu Shukuan;Zhao Lizhi;Xu Hao(The Fifth Geological Exploration Institute of Qinghai Province;Qinghai State Investment Mining Investment Co.,Ltd.)

机构地区：[1]青海省第五地质矿产勘查院 [2]青海国投矿业投资有限责任公司

出　　处：《黄金》2023年第12期71-76,81,共7页Gold

基　　金：青海省自然资源厅基金项目(2022013031qj021)。

摘　　要：哈图稀土矿床为近年来新发现的矿床,位于昆中断裂以北,大地构造位置上处于东昆仑造山带的昆北复合岩浆弧带上,区域内构造-岩浆岩极为发育。哈图稀土矿区内的中志留世侵入岩体与已发现的稀土矿化关系极为密切,是矿体最主要的赋矿岩体,岩体编号分别为Ⅰ号、Ⅱ号和Ⅲ号,岩性均为碱性正长岩。Ⅰ号岩体内圈定出M1-1、M1-22条矿体,M1-3、M1-42条矿化体;Ⅱ号岩体内圈定出M2-1矿体,M2-2、M2-32条矿化体。矿(化)体主要赋存于碱性正长岩中,矿床成因类型为与碱性正长岩有关的稀土矿床,由软流圈地幔部分熔融形成的幔源岩浆与其诱发的古老地壳物质混合并经历高程度演化和岩浆自交代作用形成,稀土元素偏向于在最晚阶段的碱性正长岩中富集。Hatu Rare Earth Deposit is a newly discovered deposit in recent years,located north of the Middle Kunlun fault and geotectonically in the North Kunlun composite magmatic arc zone of the Eastern Kunlun orogenic belt.The tectonic-magmatic rocks are well-developed in the region.The intrusion rock bodies of the Middle Silurian in Hatu Rare Earth District are closely related to known rare earth mineralization.They are the main ore-hosting rocks of the ore body,with rock numbers I,II,and III,all of which are alkaline feldspar syenite.2 ore bodies,M1-1 and M1-2,and 2 mineralized bodies,M1-3 and M1-4,are delineated in rock body I;ore body M2-1,and 2 minera-lized bodies,M2-2 and M2-3,are delineated in rock body II.The ore(mineralized)bodies are mainly present in alkaline feldspar syenite.The deposit is a rare earth deposit related to alkaline feldspar syenite.It was formed by the mixing of mantle-derived magma from partial mantle melting and fusion in the asthenosphere and ancient crustal materials,followed by a high degree of evolution and magmatic self-metasomatism.Rare earth elements tend to be enriched in the latest alkaline feldspar syenite.

关 键 词：东昆仑造山带 哈图 稀土矿床 矿床成因 成矿模式 碱性正长岩 

分 类 号：TD11[矿业工程—矿山地质测量]