In situ LA–ICP–MS analyses of muscovite: Constraints on granite-type Li mineralization in northwestern Jiangxi, South China
In situ LA–ICP–MS analyses of muscovite: Constraints on granite-type Li mineralization in northwestern Jiangxi, South China
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DOI：
10.1016/j.oregeorev.2023.105402
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发表时间：
2023-03
影响因子：
3.3
通讯作者：
Zhe Xu;Yong Zhang;Jiayong Pan;Fugong Zhang;F. Xia;Zheng-Chang Wu;Shan-chu Han;Guoqi Liu
中科院分区：
文献类型：
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作者：
Zhe Xu;Yong Zhang;Jiayong Pan;Fugong Zhang;F. Xia;Zheng-Chang Wu;Shan-chu Han;Guoqi Liu
赣北(中国南部)的狮子岭-白水洞(1.1Mt@0.3wt%Li2O)、宜春#414(0.6Mt@0.39wt%Li2O)等巨型花岗岩型锂(锂)矿床在构造上位于江南造山带。稀有金属的浓缩和富集机理(包括。(Li)在赣北仍不清楚。云母广泛分布于这种锂矿石类型中，并与矿石密切相关。因此，我们利用云母地球化学方法确定了狮子岭-白水洞和伊春#414矿床的成矿过程和成矿机制。在狮子岭-白水洞，锂矿化沿早白垩世高分馏S型白云母花岗岩的侵入-接触带集中分布。狮子岭-白水洞、伊春414号矿床普遍存在早期钠长石、白云母(富锂云母)蚀变和晚期云英岩(白云母、石英)蚀变。热液白云母和岩浆白云母分别主要为锂云母和锌铀矿。在伊春，黑云母或二云母花岗岩可能被富F和Na的岩浆热液改变，在白云母化和云英岩化阶段，Li-Nb-Ta-W为后续的成矿作用而淋失。蚀变花岗岩中交代(蚀变)平衡的白云母(M2R)具有最低的Li(663ppm)、Nb(15.2ppm)、Ta(16.7ppm)和W(6.12ppm)含量。在狮子岭-白水洞和伊春，岩浆白云母具有最高的Nb/Ta(主要是∼)，但Li/Rb较低(主要是1.5)，而热液白云母的Nb/Ta最低(主要是Nb)，但Li/Rb较高(主要是1.5)。重新平衡的白云母具有Nb/Ta=0.04~8，Li/Rb范围宽(0.1~2.0)。当锂沉淀时，重新平衡的热液白云母矿物学和化学特征表明，狮子岭-白水洞花岗岩型锂矿建造中的热液蚀变起主要作用。
Giant granite-type lithium (Li) deposits in northern Jiangxi province (South China), such as the Shiziling–Baishuidong (1.1Mt @ 0.3 wt% Li2O) and Yichun #414 (0.6 Mt @ 0.39 wt% Li2O), are tectonically located in the Jiangnan Orogen. The concentration and enrichment mechanism of rare metals (incl. Li) in northern Jiangxi is still unclear. Mica is widely distributed in this Li-ore type and is closely ore-related. Therefore, we used mica geochemistry to determine the mineralization process and mechanism of the Shiziling-Baishuidong and Yichun #414 deposits. At Shiziling-Baishuidong, lithium mineralization is concentrated along the intrusiveendo-contact of Early Cretaceous highly-fractionated S-type muscovite granite. Early albite and muscovite (with Li-rich mica) alterations, and late greisen (muscovite and quartz) alterations are common in the Shiziling-Baishuidong and Yichun #414 deposits. The hydrothermal and magmatic muscovite is mostly lepidolite and zinnwaldite, respectively. At Yichun, the biotite- or two-mica granite may have altered by F- and Na-rich magmatic–hydrothermal fluids, leaching the Li-Nb-Ta-W for the subsequent mineralization in the muscovitization and greisenization stages. The re-equilibrated muscovite (M2r), a metasomatic(altered) equilibrated muscovite in the altered granite, has the lowest Li (663 ppm), Nb (15.2 ppm), Ta (16.7 ppm), and W (6.12 ppm) contents. At both Shiziling–Baishuidong and Yichun, the magmatic muscovite has the highest Nb/Ta (mostly > 8) but lower Li/Rb (mostly 1.5), whereas the hydrothermal muscovite has the lowest Nb/Ta (mostly ∼ 4) but higher Li/Rb (mostly > 1.5). The re-equilibrated muscovite has Nb/Ta = 4 to 8 and a wide Li/Rb range (0.1 to 2.0). When lithium was precipitated, the re-equilibrated and hydrothermal muscovite mineralogy and chemistry show that hydrothermal alteration was essential in the granite-type Li ore formation at Shiziling–Baishuidong.