| 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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| 关键词:rutile U-Pb dating geochemical characteristics Jinxiantou Au-Cu deposit Wulian Qibaoshan complex |
| 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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| U-Pb Dating and Geochemical Characteristics of Rutile from the Jinxiantou Au-Cu Deposit, Wulian, Shandong Province |
| 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. |
| QIU Jing,LI Jie,SONG Mingchun,LONG Tao,BAO Zhe,WANG Xin,LI Shuangfei.2026.U-Pb Dating and Geochemical Characteristics of Rutile from the Jinxiantou Au-Cu Deposit, Wulian, Shandong Province[J].Acta Geoscientica Sinica,47(1):205-219. |
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