| 山东五莲金线头金铜矿床金红石U-Pb定年及地球化学特征 |
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| 引用本文：邱晶,李杰,宋明春,龙涛,鲍喆,王欣,李双飞.2026.山东五莲金线头金铜矿床金红石U-Pb定年及地球化学特征[J].地球学报,47(1):205-219. |
| DOI：10.3975/cagsb.2025.112722 |
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| 基金项目:由新一轮找矿突破战略行动科技支撑项目(编号: ZKKJ202405; ZKKJ202406)、2024年度部省合作项目(编号: 2024ZRBSHZ130)和河北省全职引进国家高层次创新型人才科研项目(编号: 2023HBQZYCXY010)联合资助。 |
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| 中文摘要:山东省五莲县七宝山地区是我国东部重要的金多金属矿产地, 发育金线头、敞沟—杏山峪等大中型金多金属矿床。前人主要根据七宝山杂岩体的岩浆结晶年龄限定成矿年龄, 缺乏对矿床形成时代的精确厘定。本文以金线头金铜矿床为研究对象, 在对矿床地质和矿相学特征研究的基础上, 识别出了矿石中的热液金红石, 测试了其U-Pb同位素年龄和原位微量元素组成, 同时测试了黄铁矿的原位微量元素组成。测试结果表明: 热液金红石的形成年龄为(123.8±1.7) Ma; 金红石中富含Fe、Cr、V和少量Al、Mg等元素, 富集Nb、Ta、Zr、Hf等高场强元素; ΣREE含量为2.33×10–6~76.33×10–6, 相对富集轻稀土元素, 具有明显的负Eu异常和正Ce异常。黄铁矿富含Co、Ni、Cu、Pb、Zn等元素和少量Ag、Au。综合分析认为, 金线头金铜矿床的成矿时代为早白垩世, 金红石的微量元素组成指示成矿物质以古老的壳源物质为主, 少部分为幔源物质。黄铁矿的微量元素组成指示, 早期黄铁矿具有火山成因特征, 中期(主成矿阶段)黄铁矿为热液成因, 晚期黄铁矿为沉积成因。金线头金铜矿床与胶东金矿的形成时代一致, 是晚中生代热隆-伸展成矿作用的结果。胶莱盆地南缘具有较好的金铜矿找矿前景。 |
| 中文关键词:金红石 U-Pb定年 地球化学特征 金线头金铜矿床 五莲七宝山杂岩体 |
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| U-Pb Dating and Geochemical Characteristics of Rutile from the Jinxiantou Au-Cu Deposit, Wulian, Shandong Province |
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| Abstract:The Qibaoshan area in Wulian City, Shandong Province, is a significant gold polymetallic metallogenic province in Eastern China that hosts several large-and medium-sized gold polymetallic deposits, including the Jinxiantou and Changgou–Xingshanyu deposits. Previous studies have primarily constrained the mineralization age of the Qibaoshan Complex based on its magmatic crystallization age, which lacks robust geochronological constraints on the precise timing of distinct mineralization types. This study focuses on the Jinxiantou Au-Cu deposit. Based on detailed investigations of the geology of the deposit and ore petrography, hydrothermal rutile within the ores was identified. U-Pb isotopic dating was conducted on rutile, accompanied by in situ trace element analysis of both the rutile and associated pyrite.Analytical results demonstrate that hydrothermal rutile crystallized at (123.8±1.7) Ma, and was rich in Fe, Cr, and V, with trace amounts of Al and Mg. It also exhibited enrichment in high-field-strength elements such as Nb, Ta, Zr, and Hf. The ΣREE content ranges from 2.33×10–6 to 76.33×10–6, with a relative enrichment of light rare earth elements. Moreover, it displayed distinct negative Eu and positive Ce anomalies. The pyrite was enriched in Co, Ni, Cu, Pb, and Zn, along with minor amounts of Ag and Au. Integrated analysis indicated that the mineralization of the Jinxiantou Au-Cu deposit occurred during the Early Cretaceous. Trace element compositions of rutile revealed that the mineralizing materials were predominantly derived from ancient crustal sources with subordinate mantle-derived components. Furthermore, the trace element signature of pyrite reveals that the early-stage pyrite is of volcanic origin, the middle-stage (main mineralization stage) pyrite is hydrothermal, and the late-stage pyrite is sedimentary in origin. The metallogenic age of the Jinxiantou Au-Cu deposit is coeval with that of the Jiaodong Au deposits, both record a thermal doming-extension setting. A significant Au-Cu mineral exploration potential is indicated along the southern margin of the Jiaolai Basin. |
| keywords:rutile U-Pb dating geochemical characteristics Jinxiantou Au-Cu deposit Wulian Qibaoshan complex |
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