| 郭小飞.赣南西华山成矿花岗岩锆石U-Pb年代学和Hf同位素特征及其地质意义[J].地质与勘探,2022,58(3):585-596 |
| 赣南西华山成矿花岗岩锆石U-Pb年代学和Hf同位素特征及其地质意义 |
| Zircon U-Pb geochronology and Hf isotope characteristics of the Xihuashan granites in southern Jiangxi Province and their geological significance |
| 投稿时间：2021-12-23 修订日期：2022-03-25 |
| DOI：10.12134/j.dzykt.2022.03.010 |
| 中文关键词: 黑云母花岗岩 锆石U-Pb年代学 Hf同位素 源区分析 西华山钨矿 赣南 |
| 英文关键词: biotite granite, zircon U-Pb geochronology, Hf isotope composition, provenance analysis, Xihuashan granite, southern Jiangxi Province |
| 基金项目:江西省教育厅科技计划项目（编号：GJJ170539）和江西理工大学高层次人才科研启动项目（编号：jxxjbs17068、205200100459）资助 |
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| 中文摘要: |
| 赣南西华山钨矿是与侏罗纪花岗岩有关的大型石英脉型矿床，乃我国南岭成矿带赣南地区典型的钨矿床。本文选取西华山钨矿成矿花岗岩进行了锆石LA-ICP-MS U-Pb定年、微量元素和Hf同位素分析，旨在揭示花岗岩的形成时间并推断岩石成因及其对成矿的指示。锆石U-Pb测年结果表明，西华山中粒黑云母花岗岩锆石206Pb/238U加权平均年龄为154.8 ± 6.0 Ma。锆石形态、激光拉曼和地球化学特征表明，该花岗岩受到热液的影响。锆石的176Yb/177Hf和176Lu/177Hf比值较高，表明源岩浆有强烈的流体出溶作用。西华山黑云母花岗岩的εHf（t）变化范围较小，呈明显负值（–12.8~–10.8），且集中在华夏地块古老基底范畴内，指示其形成于古老地壳物质的部分熔融。 |
| 英文摘要: |
| The Xihuashan tungsten deposit in southern Jiangxi is a large quartz vein type deposit related to the Jurassic granite, and is a typical tungsten deposit in southern Jiangxi of Nanling metallogenic belt in China. This work performed zircon LA-ICP-MS U-Pb dating, and trace elements and Hf isotopic analysis on the mineralized granites from the Xihuashan tungsten deposit, aiming to reveal the formation time of granites, and thus to infer their petrogenesis and their implications for mineralization. Zircon U-Pb dating shows that the weighted average 206Pb/238U age of the medium-grained biotite granite in Xihuashan is 154.8 ± 6.0 Ma. Zircon morphology, laser Raman and geochemical characteristics indicate that the granites were influenced by hydrothermal fluids. The 176Yb/177Hf and 176Lu/177Hf ratios of zircons are relatively high, which reveals that the source magma has undergo strong fluid exsolution. The εHf (t) of the Xihuashan biotite granite varies in a narrow range from -12.8 to -10.8, indicative of their origination from the ancient basement of the Cathaysia Block. The Xihuashan biotite is inferred to be formed by partial melting of ancient crustal materials. |
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