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王先广, 刘战庆, 刘善宝, 王成辉, 刘建光, 万浩章, 陈国华, 张树德, 刘小林. 江西朱溪铜钨矿细粒花岗岩LA-ICP-MS锆石U-Pb定年和岩石地球化学研究[J]. 岩矿测试, 2015, 34(5): 592-599. DOI: 10.15898/j.cnki.11-2131/td.2015.05.016
引用本文: 王先广, 刘战庆, 刘善宝, 王成辉, 刘建光, 万浩章, 陈国华, 张树德, 刘小林. 江西朱溪铜钨矿细粒花岗岩LA-ICP-MS锆石U-Pb定年和岩石地球化学研究[J]. 岩矿测试, 2015, 34(5): 592-599. DOI: 10.15898/j.cnki.11-2131/td.2015.05.016
Xian-guang WANG, Zhan-qing LIU, Shan-bao LIU, Cheng-hui WANG, Jian-guang LIU, Hao-zhang WAN, Guo-hua CHEN, Shu-de ZHANG, Xiao-lin LIU. LA-ICP-MS Zircon U-Pb Dating and Petrologic Geochemistry of Fine-grained Granite from Zhuxi Cu-W Deposit, Jiangxi Province and Its Geological Significance[J]. Rock and Mineral Analysis, 2015, 34(5): 592-599. DOI: 10.15898/j.cnki.11-2131/td.2015.05.016
Citation: Xian-guang WANG, Zhan-qing LIU, Shan-bao LIU, Cheng-hui WANG, Jian-guang LIU, Hao-zhang WAN, Guo-hua CHEN, Shu-de ZHANG, Xiao-lin LIU. LA-ICP-MS Zircon U-Pb Dating and Petrologic Geochemistry of Fine-grained Granite from Zhuxi Cu-W Deposit, Jiangxi Province and Its Geological Significance[J]. Rock and Mineral Analysis, 2015, 34(5): 592-599. DOI: 10.15898/j.cnki.11-2131/td.2015.05.016

江西朱溪铜钨矿细粒花岗岩LA-ICP-MS锆石U-Pb定年和岩石地球化学研究

LA-ICP-MS Zircon U-Pb Dating and Petrologic Geochemistry of Fine-grained Granite from Zhuxi Cu-W Deposit, Jiangxi Province and Its Geological Significance

  • 摘要: 江西朱溪铜钨矿床是近年来在赣北地区发现的又一超大型矽卡岩型钨矿, 矿床的形成与花岗岩类侵入体密切相关, 矿区处于钦—杭结合带江西段塔前—赋春成矿带中部。该矿床的发现进一步证明了研究区建立的“南钨北扩”格局, 然而前人对其成矿岩浆岩地球化学特征及侵入时代缺少必要的研究, 直接制约了对这一格局的深入认识。本文选择朱溪铜钨矿区与成矿有关的细粒白云母花岗岩作为研究对象, 结合详细野外地质工作和前人研究成果, 首次采用LA-ICP-MS锆石U-Pb定年方法获得了该岩体中锆石206Pb/238U加权平均年龄为146.90±0.97 Ma(MSWD=0.55);并利用X射线荧光光谱和ICP-MS技术进行岩石地球化学分析, 结果显示该岩体具有高硅、高碱、富钾、强过铝质的地球化学特征, 属于典型的S型花岗岩, 说明晚侏罗世早期在江南隆起一带存在一期与成矿作用有关的岩浆侵位事件, 为研究朱溪超大型铜钨矿和区域上塔前—赋春成矿带成矿规律研究提供了新证据。

     

    Abstract: Zhuxi W-Cu deposit in northern Jiangxi Province is a recently found super large skarn W deposit. The formation of this deposit is closely related to granitic intrusions. The mining area is located in the central Jiangxi Taqian-Fuchun ore belt in Qin(zhou)-Hang(zhou) joint zone. The discovery of this deposit is further evidence for the model of the Southern tungsten North expansion. However, due to the lack of systematic geochemistry and geochronology of ore-related intrusions, the knowledge of this model is limited. Ore-related fine-grained muscovite granite was chosen as the research object for the study reported on in this paper. LA-ICP-MS zircon U-Pb dating of granite yielded a 206Pb/238U weighted average age of 146.90±0.97 Ma (MSWD=0.55). These granitic rocks have high silicon, alkali and potassium, and are strongly peraluminous, which belongs to the typical S-type granite. This study has indicated that ore-related magmatism occurred at the late Jurassic in Jiangnan uplift and provides new evidence for the genesis of Zhuxi W-Cu deposit and metallogenic regularity of the Taqian-Fuchun metallogenic belt.

     

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