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湘东北虎形山钨铍矿区隐伏花岗岩体地球化学特征及成因研究

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徐军伟, 王玉华, 曾认宇, 廖凤初, 李素欣. 2024. 湘东北虎形山钨铍矿区隐伏花岗岩体地球化学特征及成因研究. 华南地质, 40(2): 365-379. doi: 10.3969/j.issn.2097-0013.2024.02.012
引用本文: 徐军伟, 王玉华, 曾认宇, 廖凤初, 李素欣. 2024. 湘东北虎形山钨铍矿区隐伏花岗岩体地球化学特征及成因研究. 华南地质, 40(2): 365-379. doi: 10.3969/j.issn.2097-0013.2024.02.012
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XU Jun-Wei, WANG Yu-Hua, ZENG Ren-Yu, LIAO Feng-Chu, LI Su-Xin. 2024. Geochemistry and Genesis of Concealed Granite in Huxingshan Tungsten-Beryllium Ore District, Northeast Hunan Province. South China Geology, 40(2): 365-379. doi: 10.3969/j.issn.2097-0013.2024.02.012
Citation: XU Jun-Wei, WANG Yu-Hua, ZENG Ren-Yu, LIAO Feng-Chu, LI Su-Xin. 2024. Geochemistry and Genesis of Concealed Granite in Huxingshan Tungsten-Beryllium Ore District, Northeast Hunan Province. South China Geology, 40(2): 365-379. doi: 10.3969/j.issn.2097-0013.2024.02.012
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湘东北虎形山钨铍矿区隐伏花岗岩体地球化学特征及成因研究

  • 1.地球化学过程与资源环境效应湖南省重点实验室，湖南 长沙 410014;

  • 2.湖南省地球物理地球化学调查所，湖南 长沙 410014;

  • 3.中南大学有色金属成矿预测与地质环境监测教育部重点实验室，湖南 长沙 410083;

  • 4.东华理工大学核资源与环境国家重点实验室，江西 南昌 330013

  • 基金项目:

    湖南省自然资源科技计划项目（20230134DZ）

详细信息
    作者简介: 徐军伟(1982-),男,博士,从事矿产勘查与矿床地质研究工作,E-mail:108350600@qq.com
    通讯作者: 王玉华(1994-),男,博士,从事成矿地球化学研究,E-mail:yuhuawang2018@126.com

  • 中图分类号: P618.67;P618.72

Geochemistry and Genesis of Concealed Granite in Huxingshan Tungsten-Beryllium Ore District, Northeast Hunan Province

  • 1. Provincial Key Laboratory of Geochemical Processes and Resource Environmental Effects, Central South University, Changsha 410014, Hunan, China;

  • 2.Geophysical and Geochemical Survey Institute of Hunan Province, Changsha 410014, Hunan, China;

  • 3. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Ministry of Education), Central South University, Changsha 410083, Hunan, China;

  • 4. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China

More Information

    摘要
  • 湘东北虎形山钨铍多金属矿床为一大型的石英、云英岩细脉带型白钨矿床和绿柱石铍矿床。本文通过对矿区内新发现的隐伏花岗岩体详细的岩石地球化学分析，探讨了该岩体的成因、物质来源和构造环境，以期为区域岩浆作用与成矿关系研究提供理论支撑。结果表明，虎形山花岗岩为富SiO2（71.86%～73.22%）和Al2O3（13.99%～14.55%），贫TFe2O3（1.17%～1.63%）和MgO（0.28%～0.36%），且相对贫钠富钾（K2O/Na2O介于1.11～1.78 之间）的高钾钙碱性、过铝质花岗岩，并具有强烈富集轻稀土元素（La N /Yb N =9.29~21.9）和大离子亲石元素（Rb、Ba、U、K）而相对亏损重稀土元素和高场强元素（Nb、Ti、P）的特征；虎形山花岗岩是在较低压力（<5 kbar）和初始温度为707~746℃环境中经高程度分离结晶作用（斜长石、钾长石、磷灰石等）形成的S型花岗岩，其地壳源区为泥质岩和砂屑岩组成的冷家溪群；结合区域构造演化，本文认为燕山期古太平洋板块的低角度俯冲造成湘东北地区地壳发生强烈的变形，随后区域应力的减弱使得增厚的岩石圈发生拆沉，在此情况下，地壳减薄或幔源物质底侵引起了该地区强烈的岩浆活动，进而形成了虎形山花岗岩。
    The tungsten-beryllium polymetallic deposit at Huxingshan in northeastern Hunan Province is a large-scale quartz and greisen vein-belt type scheelite and beryl beryllium deposit. To investigate its genesis, material source and tectonic environment, we carried out detailed rock geochemical analyses on the newly discovered concealed granite bodies in the Huxingshan mining area, so to provide the theory support for the relationship between local magmatism and mineralization. The results show that the Huxingshan granite is a series of high-K calc-alkaline peraluminous granite rich in SiO2 (71.86% ~73.22% ) and Al2O3 (13.99% ~ 14.55%), poor in TFe2O3 (1.17%~1.63%) and MgO (0.28%~0.36%), and relatively poor in Na and rich in K (with the (K2O /Na2O) ration between 1.11 and 1.78). It is characterized by strong enrichment of light rare earth elements (La N /Yb N =9.29~21.9) and large ion lithophile elements (Rb, Ba, U, K), and relative depletion of heavy rare earth elements and high field strength elements (Nb, Ti, P). The geochemical characteristics show that Huxingshan granite is an S-type granite formed in an environment of lower pressure (< 5 kbar) and an initial temperature of 727~785℃. It was formed by a high degree of fractional crystallization (plagioclase, potash feldspar, apatite, etc.), and its crust source area is Lengjiaxi Group composed of mudstone and sandstone. Combined with the tectonic evolution history of the region, this study concluded that the low-angle subduction of the Paleo-Pacific Plate during the Yanshan Period caused strong deformation of the crust in the northeast Hunan region, and the subsequent weakening of regional stresses led to the detachment of the thickened lithosphere, in which case the crustal thinning or underplating of mantle source material had caused intense magmatism in the region, which resulted in the formation of the Huxingshan Granite.
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收稿日期:  2024-02-20
修回日期:  2024-04-08
刊出日期:  2024-06-25

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