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现代地质 ›› 2023, Vol. 37 ›› Issue (06): 1449-1466.DOI: 10.19657/j.geoscience.1000-8527.2023.068

• 矿床学与区域成矿学 • 上一篇    下一篇

赣南金竹坪钨矿床多期成矿作用特征及地质意义

杨俊峰(), 张娟(), 刘新星, 邱佳炜, 王猛, 成嘉伟, 卢克轩, 王瑛雪   

  1. 河北地质大学河北省战略性关键矿产资源重点实验室,河北 石家庄 050031
  • 收稿日期:2022-08-27 修回日期:2023-06-02 出版日期:2023-12-10 发布日期:2024-01-24
  • 通讯作者: 张娟,女,博士,副教授,1987年出生,矿物学、岩石学、矿床学专业,主要研究方向为金属矿床学。Email:zhangjqtds@126.com
  • 作者简介:杨俊峰,男,硕士研究生,1998年出生,矿物学、岩石学、矿床学专业,主要从事金属矿床成矿作用的研究。Email:yangjunfeng0101@163.com
  • 基金资助:
    科技部国家重点研发计划青年科学家项目“藏北高Sr/Y淡色花岗岩W-Nb-Ta成矿作用与找矿快速定位”(2021YFC2900100);国家自然科学基金项目“基于稀土矿物波谱特征参量的稀土含量反演模型研究”(41702352)

Characteristics of Multiphase Mineralization of Jinzhuping Tungsten Deposit in Southern Jiangxi Province and Its Geological Significance

YANG Junfeng(), ZHANG Juan(), LIU Xinxing, QIU Jiawei, WANG Meng, CHENG Jiawei, LU Kexuan, WANG Yingxue   

  1. Hebei Key Laboratory of Strategic Critical Mineral Resources, Hebei GEO University, Shijiazhuang, Hebei 050031, China
  • Received:2022-08-27 Revised:2023-06-02 Online:2023-12-10 Published:2024-01-24

摘要:

金竹坪矿床是南岭东段赣南地区钨多金属成矿带内一处典型的石英脉型钨矿床。燕山期隐伏中粗粒(或似斑状)黑云母二长花岗岩与成矿作用密切相关,早期矿体受后期热液交代作用改造强烈而表现多世代成矿的特征。关于隐伏岩体与多期成矿活动的时间,目前依然缺乏精确的年代学制约。本文利用锆石和黑钨矿LA-ICP-MS U-Pb测年方法对矿床内似斑状黑云母二长花岗岩及3个世代的黑钨矿进行定年,揭示成矿多期演化史,并探讨成矿作用过程。结果显示,似斑状黑云母二长花岗岩岩浆锆石年龄为(155.2±0.7) Ma,3个世代黑钨矿年龄分别为(164.9±2.4) Ma、(157.4±1.0) Ma和(144.8±1.8) Ma。综合分析认为金竹坪钨矿床隐伏岩体侵位于159~155 Ma,三期热液钨矿化作用形成于164.9~144.8 Ma,它们均系燕山期南岭钨锡多金属成矿带大规模成岩成矿作用的产物。前两个世代钨矿化年龄与花岗岩体侵位时代在误差范围内基本一致,处于南岭中—晚侏罗世成矿高峰期;而第三个世代钨矿化则较岩体形成晚约10 Ma,可能代表中晚侏罗世成矿作用后新发生的一期早白垩世钨矿化作用。

关键词: 黑钨矿, U-Pb定年, 热液钨矿化作用, 金竹坪钨矿床

Abstract:

The Jinzhuping quartz vein-type tungsten deposit is located in the tungsten-polymetallic metallogenic belt in the eastern Nanling region, southern Jiangxi Province.The Yanshanian concealed granite is associated with the Tungsten mineralization, and the lithology is medium-coarse-grained (or porphyritic) biotite monzogranite.The early orebody was strongly affected by late hydrothermal metasomatism, showing multi-generational characteristics.At present, there is still a lack of precise chronology on the time of buried pluton and multi-stage mineralization.In this paper, zircon and wolframite LA-ICP-MS U-Pb dating methods are used to date the porphyrotic biotite monzolitic granite and three generations of wolframites in the deposit.Our data reveal the multistage metallogenic evolution, and we further discuss the mineralization process.The results show that porphyritic biotite monzogranite was formed at (155.2±0.7) Ma, whilst the three generationgs of wolframites were formed at (164.9±2.4) Ma, (157.4±1.0) Ma and (144.8±1.8) Ma.We considered that the concealed rock of Jinzhuping tungsten deposit was emplaced in 159-155 Ma, and the three stages of hydrothermal tungsten mineralization were formed in 164.9-144.8 Ma, which were the products of large-scale magmatism and mineralization in the Yanshanian Nanling tungsten-tin polymetallic metallogenic belt.The first two generations of tungsten mineralization age and granite emplacement age are within error, and is between the previously reported Middle to Late Jurassic for the Nanling metallogenic peak.Meanwhile, the tungsten mineralization age of the third generation is about 10 Ma later than the granite formation, which may represent the newfound Early Cretaceous tungsten mineralization after the Middle and Late Jurassic mineralization.

Key words: wolframite, U-Pb dating, hydrothermal tungsten mineralization, Jinzhuping tungsten deposit

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