鲁西沂南金多金属矿床石榴子石U-Pb年代学、元素地球化学及其对成矿流体演化的约束

doi:10.3799/dqkx.2026.138

鲁西沂南金多金属矿床石榴子石U-Pb年代学、元素地球化学及其对成矿流体演化的约束

doi: 10.3799/dqkx.2026.138

刘传朋^1,2,3,4,
刘颜^5,,
马钊^2,3,
冯广²,
张伟²,
张英梅^2,3,
韩双元^2,3,
谭俊^6,

1. 中国地质大学（武汉）国家卓越工程师学院，湖北武汉 430074 2. 山东省鲁南地质工程勘察院（山东省地质矿产勘查开发局第二地质大队），山东济宁 272100 3. 三稀矿产勘查与综合利用山东省工程研究中心，山东济宁 272100 4. 山东省地质矿产勘查开发局第五地质大队（山东省第五地质矿产勘查院），山东泰安 271000 5. 长江大学资源与环境学院，湖北武汉 430100 6. 中国地质大学（武汉）资源学院，湖北武汉 430074

基金项目:

山东省自然科学基金面上项目(No.ZR2025MS658)；山东省鲁南地质工程勘察院（山东省地质矿产勘查开发局第二地质大队）开放基金项目(No.LNY202303)；国家自然科学基金项目(No.42302089).

详细信息

作者简介:
刘传朋(1981–)，男，正高级工程师，主要从事矿产勘查及研究工作. ORCID: 0009-0003-8370-5996. Email: liuchuanpeng666@163.com

通讯作者:
刘颜(1992–)，男，副教授，主要从事矿床学和矿床地球化学研究. ORCID: 0009-0002-5770-6613. Email: yanliu0820@yangtzeu.edu.cn

谭俊(1982–)，男，教授，主要从事矿床地球化学、矿产普查与勘探方面的研究. Email: tanjun@cug.edu.cn

中图分类号: P578.947; P597.3
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- 收稿日期: 2026-01-15

Garnet U-Pb Geochronology and Geochemistry of the Yinan Gold Polymetallic Deposit, Luxi District: Insights into fluid evolution during skarn formation

1. College for elite engineers, China University of Geosciences, Wuhan 430074, China 2. Shandong Provincial Lunan Geology and Exploration Institute (Shandong Provincial Bureau of Geology and Mineral Resources No.2 Geological Brigade), Jining 272100, China 3. Rare Mineral Exploration and Comprehensive Utilization Engineering Research Center of Shandong Province, Jining 272100, China 4. No.5 Geological Brigade of Shandong Provincial Bureau of Geology and Mineral Resources (No. 5 Institute of Geology and Mineral Exploration of Shandong Province), Taian 271000, China 5. College of Resources and Environment, Yangtze University, Wuhan 430100, China 6. School of Earth Resources, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 沂南金铜铁矿床是鲁西乃至山东省唯一的大型矽卡岩型金多金属矿床，但其矽卡岩期成矿流体的特征及演化过程仍研究较为薄弱。对该矿床深部矿体的石榴子石开展了系统的岩相学、原位U-Pb年代学和微区元素地球化学研究。结果显示，矿床中的石榴子石可分为四个世代，整体属于钙铝榴石-钙铁榴石（Grs_0.00-67.03Adr_31.36-100.00）固溶体系列，其形成年龄为127~126 Ma，代表成矿年龄的上限。微区微量元素特征表明，第一世代石榴子石结晶于低氧逸度、近中性、低水岩比的封闭系统，显示类球粒陨石的Y/Ho值（~28）；后三个世代石榴子石具有变化范围较大的Y/Ho值（0.91~68.7），其结晶的氧逸度经历了升高到降低再升高的变化，pH值则经历了降低到升高再降低的变化，流体系统逐渐由封闭转变为开放，水岩比持续升高。结合前人流体包裹体及H-O同位素研究，上述元素特征及物理化学条件的转变是两期岩浆水的脉动式注入及不同比例大气降水混入的结果，并伴随着流体沸腾和高氧逸度流体的形成，进而诱发后期金属矿物的大量沉淀。
- 石榴子石 /
- 原位U-Pb定年 /
- 微量元素 /
- 流体演化 /
- 沂南 /
- 鲁西
Abstract: The Yinan Au-Cu-Fe deposit is the only large-scale skarn-type Au polymetallic deposit in the Luxi District and even the entire Shandong Province. However, the characteristics and evolution of ore-forming fluids during the skarn stage remain poorly understood. This study presents systematic petrographic, in situ U-Pb geochronological, and micro-scale elemental geochemical analyses of garnet from the deep orebodies of the deposit. The results show that garnet in the deposit can be divided into four generations, all belonging to the grossular-andradite (Grs_0.00–67.03Adr_{31.36–100.00}) solid solution series. Their formation ages range from 127 to 126 Ma, representing the upper limit of the mineralization age. Micro-scale trace element characteristics indicate that the first-generation garnet crystallized in a closed system with low oxygen fugacity, near-neutral pH, and low water-rock ratio, exhibiting a chondrite-like Y/Ho ratio (~28). In contrast, the subsequent three generations of garnet display highly variable Y/Ho ratios (0.91–68.7), and their crystallization experienced fluctuations in oxygen fugacity (initially increasing, then decreasing, and finally increasing again) and pH (initially decreasing, then increasing, and finally decreasing again). The fluid system gradually evolved from a closed to an open system, accompanied by a progressive increase in the water/rock ratio. Combined with previous fluid inclusion and H–O isotope studies, these elemental characteristics and transformations in physicochemical conditions are interpreted as the result of pulsating injections of two episodes of magmatic water, mixed with varying proportions of meteoric water. This process was accompanied by fluid boiling and the formation of high-oxygen-fugacity fluids, thereby inducing extensive precipitation of metallic minerals in the later stage.
- garnet /
- in situ U-Pb dating /
- trace elements /
- fluid evolution /
- Yinan /
- Luxi District

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参考文献(51)

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鲁西沂南金多金属矿床石榴子石U-Pb年代学、元素地球化学及其对成矿流体演化的约束

doi: 10.3799/dqkx.2026.138

作者简介:
刘传朋(1981–)，男，正高级工程师，主要从事矿产勘查及研究工作. ORCID: 0009-0003-8370-5996. Email: liuchuanpeng666@163.com

通讯作者:
刘颜(1992–)，男，副教授，主要从事矿床学和矿床地球化学研究. ORCID: 0009-0002-5770-6613. Email: yanliu0820@yangtzeu.edu.cn

谭俊(1982–)，男，教授，主要从事矿床地球化学、矿产普查与勘探方面的研究. Email: tanjun@cug.edu.cn

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Garnet U-Pb Geochronology and Geochemistry of the Yinan Gold Polymetallic Deposit, Luxi District: Insights into fluid evolution during skarn formation

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鲁西沂南金多金属矿床石榴子石U-Pb年代学、元素地球化学及其对成矿流体演化的约束

doi: 10.3799/dqkx.2026.138

作者简介: 刘传朋(1981–)，男，正高级工程师，主要从事矿产勘查及研究工作. ORCID: 0009-0003-8370-5996. Email: liuchuanpeng666@163.com

通讯作者: 刘颜(1992–)，男，副教授，主要从事矿床学和矿床地球化学研究. ORCID: 0009-0002-5770-6613. Email: yanliu0820@yangtzeu.edu.cn 谭俊(1982–)，男，教授，主要从事矿床地球化学、矿产普查与勘探方面的研究. Email: tanjun@cug.edu.cn

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Garnet U-Pb Geochronology and Geochemistry of the Yinan Gold Polymetallic Deposit, Luxi District: Insights into fluid evolution during skarn formation

计量

出版历程

目录

作者简介:
刘传朋(1981–)，男，正高级工程师，主要从事矿产勘查及研究工作. ORCID: 0009-0003-8370-5996. Email: liuchuanpeng666@163.com

通讯作者:
刘颜(1992–)，男，副教授，主要从事矿床学和矿床地球化学研究. ORCID: 0009-0002-5770-6613. Email: yanliu0820@yangtzeu.edu.cn

谭俊(1982–)，男，教授，主要从事矿床地球化学、矿产普查与勘探方面的研究. Email: tanjun@cug.edu.cn