In situ LA-MC-ICP-MS and ID-TIMS U-Pb ages of bastnäsite-(Ce) and zircon from the Taipingzhen hydrothermal REE deposit: New constraints on the later Paleozoic granite-related U-REE mineralization in the North Qinling Orogen, Central China
In situ LA-MC-ICP-MS and ID-TIMS U-Pb ages of bastnäsite-(Ce) and zircon from the Taipingzhen hydrothermal REE deposit: New constraints on the later Paleozoic granite-related U-REE mineralization in the North Qinling Orogen, Central China
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太平镇热液稀土矿床中氟碳铈矿和锆石原位 LA-MC-ICP-MS 和 ID-TIMS U-Pb 年龄：对北方晚古生代花岗岩相关 U-REE 矿化的新约束
DOI：
10.1016/j.jseaes.2019.02.002
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发表时间：
2019-04
影响因子：
3
通讯作者：
Li Jinghui
中科院分区：
文献类型：
--
作者：
Qu Kai;Sima Xianzhang;Zhou Hongying;Xiao Zhibin;Tu Jiarun;Yin Qingqing;Liu Xing;Li Jinghui
太平镇存款矿床是北秦岭造山带中新发现的稀土存款矿床。稀土矿赋存于古生代地层蚀变破碎带和花岗质侵入体中。矿石矿物主要有氟碳铈矿[（Ce（CO 3）F]、氟碳铈矿[CaCe 2（CO 3）3F 2]、正氟碳铈矿[CaCe（CO 3）2F]等，该存款中还含有钙硼镁石[Ce 2Al（SiO 4）2（OH）]、钙铝榴石[CaCe 3AlAl 2 Mg（Si 2 O 7）（SiO 4）3 O（OH）2]、氟铈矿[（La）LaF 3]和富F铈矿[（Ce，Ca）9 Mg（SiO_4）_3[SiO_3（OH）]_4F_3]，为首次在国内发现。为确定稀土成矿时代，探讨成矿作用与花岗岩岩浆作用的成因关系，获得了矿石中氟碳铈矿和容矿花岗岩中锆石的U-Pb年龄。氟碳铈矿的LA-MC-ICP-MS原位U-Pb年龄为409± 16 Ma，ID-TIMS U-Pb年龄为407.8± 3.3Ma;岩浆锆石U-Pb定年结果表明，围岩侵位时间为457.1±4.9Ma，399.4± 3.5Ma的热液锆石年龄记录了热液蚀变的时间，表明太平镇存款矿床的稀土成矿作用发生在409-400 Ma之间。该年龄与氟碳铈矿和锆石U-Pb年龄一致，揭示了热液与稀土成矿的成因联系。Hf同位素组成表明，古元古代下地壳高压和超高压榴辉岩的部分熔融为成矿提供了物质基础，存款形成于晚古生代碰撞后伸展事件的退变质环境。结合已发表的NQO其他铀-稀土金属矿床的年代学资料，研究表明，NQO与晚志留世-早泥盆世花岗岩有关的铀-稀土金属成矿作用主要发生在421-395 Ma之间。
The Taipingzhen deposit is a newly discovered REE deposit in the North Qinling Orogen (NQO), Central China. The REE ores are hosted in the altered fracture zones of Paleozoic strata and a granitic intrusion. The ore minerals mainly include bastnäsite-(Ce)[(Ce(CO3)F], parisite-(Ce)[CaCe2(CO3)3F2], and synchysite-(Ce)[CaCe(CO3)2F], and this deposit also contains some uncommon minerals, such as törnebohmite-(Ce)[Ce2Al(SiO4)2(OH)], gatelite-(Ce) [CaCe3AlAl2Mg(Si2O7)(SiO4)3O(OH)2], fluocerite-(La)[LaF3] and F-rich cerite-(Ce)[(Ce,Ca)9 Mg(SiO4)3[SiO3(OH)]4F3], which are identified here for the first time in China. To determine the timing of REE mineralization and explore possible genetic relationships between mineralization and granitic magmatism, the U-Pb ages of bastnäsite-(Ce) from ore and zircon from ore-hosting granite are obtained. The in situ LA-MC-ICP-MS U-Pb age of the bastnäsite-(Ce) provides a reliable 238U/206Pb-207Pb/206Pb lower intersection point age of 409±16Ma, and ID-TIMS analyses yield an U-Pb age of 407.8±3.3 Ma; the U-Pb dating of the magmatic zircon reveals that the wall rock was emplaced at 457.1±4.9Ma, and the hydrothermal zircon age of 399.4±3.5 Ma records the time of hydrothermal alteration, thus indicating that the REE mineralization in the Taipingzhen deposit occurred at approximately 409-400 Ma. This age coincides well with the U-Pb ages of the bastnäsite-(Ce) and zircon, revealing a genetic association between the hydrothermal fluid and the REE mineralization. The Hf isotopic compositions imply that the partial melting of Paleoproterozoic HP and UHP eclogite from the lower crust provided ore materials for the mineralization, and the deposit was generated in a retrograde metamorphic setting during the late Paleozoic postcollisional extension event in the NQO. Furthermore, combined with the geochronological data published for other U-REE metallic deposits in the NQO, our study indicates that the late Silurian-early Devonian granite-related U-REE metallic mineralization throughout the NQO mainly occurred during 421-395 Ma.
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