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J4 ›› 2010, Vol. 16 ›› Issue (2): 177-185.

• 矿床岩石地球化学及年代学专栏 • 上一篇    下一篇

粤北梅子窝钨矿区隐伏花岗闪长岩锆石SHRIMP U-Pb 年龄与40Ar/39Ar 成矿年龄及其地质意义

翟伟,  孙晓明,  邬云山,  孙妍,  华仁民,  杨永强,  李文铅,  李社宏   

  1. 1. 中山大学 海洋学院,广州 510275;2. 中山大学 地球科学系,广州 510275;3. 南京大学 内生金属矿床成矿机制研究国家重点实验室,南京 210093;4. 中国地质大学 地质过程与矿产资源国家重点实验室,北京100083; 5.中国科学院 广州地球化学研究所,广州 510640
  • 收稿日期:2009-10-12 修回日期:2010-02-28 出版日期:2010-06-20 发布日期:2010-06-20
  • 作者简介:翟伟,男,1965年生,博士,高级工程师,主要从事矿床地球化学的教学和研究; E-mail: eeszw@mail.sysu.edu.cn
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2007CB411404)与中央高校基本科研业务费专项基金

Zircon SHRIMP U-Pb Dating of the Buried Granodiorite and
Muscovite 40Ar/39Ar Dating of Mineralization and Geological Implications
of Meiziwo Tungsten Deposit, Northern Guangdong Province, China

ZHI  Wei,  SUN  Xiao-ming,  WU Yun-shan,  SUN  Yan,  HUA  Ren-min,  YANG Yong-qiang, LI Wen-qian, LI She-hong   

  1. 1. Marine College, Sun Yat-sen University, Guangzhou 510275, China; 2. Department of Earth Sciences, Sun Yat-sen University, Guangzhou 510275, China; 3. State Key Laboratory for Mineral Deposit Research, Nanjing University, Nanjing 210093, China; 4. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China; 5. Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China
  • Received:2009-10-12 Revised:2010-02-28 Online:2010-06-20 Published:2010-06-20

摘要:

梅子窝钨矿位于粤北瑶岭—梅子窝钨矿带的东部,成矿作用同期形成白云母的40Ar/39Ar 年龄为(155.9±0.6) Ma,与华南中生代燕山期大规模W,Sn 成矿作用的年龄一致,代表梅子窝钨矿的成矿年龄。矿床下部600 m 中段附近出现的隐伏黑云母花岗闪长岩体的锆石SHRIMP U-Pb 年龄为(430.4±3.6) Ma,为加里东期,与成矿作用无关。因此,矿区不存在前人提出的两套叠加的“五层楼”成矿模式。成矿年龄与隐伏花岗闪长岩的年龄显示梅子窝钨矿的形成可能与更深部的隐伏燕山期花岗岩有关,矿床向深部可能延伸更大。

关键词: 梅子窝钨矿, 隐伏花岗闪长岩, 锆石SHRIMP年龄, 成矿年龄

Abstract:

The Meiziwo tungsten deposit is located in eastern part of Yaoling-Meiziwo tungsten mineralization zone, northern Guangdong province. The 40Ar/39Ar age of muscovite formed in syn-mineralization period is (155.9±0.6) Ma, consistent with large scale tungsten and tin mineralization in the Mesozoic Yanshanian period in South China. This date represents the mineralization age of the Meiziwo tungsten deposit. The zircon SHRIMP U-Pb age of biotite granodiorite body, occurring at about 600 m level in the lower part of the mine, is (430.4±3.6) Ma. This age suggests that the granodiorite body formed in the Caledonian period has no genetic relation to the tungsten mineralization. Our new data disagree with the previously proposed model for the tungsten mineralization, i.e., two times of “five-story”mineralization overprinted each other in this deposit. The ages of the mineralization and granodiorite indicate that the formation of Meiziwo tungsten deposit may be related to an Yanshanian granite buried in a deeper level, and therefore, we expect that the ore bodies might have a larger extension in depth.

Key words: Meiziwo tungsten deposit, buried granodiorite, zircon SHRIMP U-Pb age, Mineralization age

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