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首页> 外文期刊>Journal of Asian earth sciences >Processes of ore genesis at the world-class Yuchiling molybdenum deposit, Henan province, China
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Processes of ore genesis at the world-class Yuchiling molybdenum deposit, Henan province, China

机译：中国河南玉池岭钼矿床的成矿过程

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摘要

The Yuchiling molybdenum deposit is one of the most significant porphyry molybdenum systems in the eastern Qjnling of central China. The mineralization is mainly hosted by a porphyritic granite and associated cryptoexplosive breccia. Hydrothermal alteration minerals include K-feldspar, sericite, pyrite, chlorite, epidote, carbonate, kaolinite, fluorite, and gypsum. Ore minerals are dominated by molybdenite and pyrite, with lesser amounts of chalcopyrite, galena, scheelite, wolframite, ilmenite, leucoxene, native gold, sphalerite, and hematite. The δ~(34)S compositions of sulfide minerals range from -6.0‰ to +4.0‰ The deposit is characterized by four hydrothermal stages: quartz-K-feldspar (stage Ⅰ), molybdenite-quartz (stage Ⅱ), pyrite-sericite-quartz (stage Ⅲ), and quartz-carbonate (stage Ⅳ). Microthermometric studies of fluid inclusions show that the fluids evolved gradually during the ore-forming process. Homogenization temperatures, salinities, and minimum pressure estimates for the inclusions from each mineralization stage evolved as follows: (1) stageⅠ: homogenization temperatures - 203.7-525.8 ℃, salinities = 2.96-10.49 and 29.66 wt.% NaCl equiv., and minimum pressures = 101.9-196.2 MPa; (2) stage Ⅱ: homogenization temperatures = 173.6-448.6 ℃, salinities = 1.81-9.74 wt.% NaCI equiv., and minimum pressures = 93.1-172.0 MPa; (3) stage Ⅲ: homogenization temperatures = 130.1-386.0 ℃, salinities = 1.40-9.73 and 34.07 wt.% Nad equiv., and minimum pressures = 95.5-142.5 MPa; (4) stage Ⅳ: homogenization temperatures = 170-230 ℃ and salinities = 0.18-5.71 wt.% NaCI equiv. Various fluid inclusions were observed to contain H_2O, CO_2, CH_4, SO_2, C_2H_2, C_2H_4, C_2H_6, and (or) H_2S, as well as solids that include halite, sylvite, anhydrite, chalcopyrite, hematite, molybdenite, and jamesonite. The δ~(18)O and 8D of the hydrothermal fluids vary from -4.4‰ to +8.5‰ and -81‰ to -61‰, respectively. Microthermometric and stable isotope data indicate that the ore-forming fluids for the Yuchiling molybdenum deposit evolved from early magmatic, to a mixture of meteoric and magmatic water, and finally to a principally late stage meteoric water. A molybdenite Re-Os age of 131.2 ±1.4 Ma coincides with the early part of the 131-112 Ma period of magmatic and related ore-forming events that are widely recognized in eastern Qinling.
机译：于池岭钼矿床是中国中部东部秦岭最重要的斑岩钼系统之一。矿化作用主要由斑状花岗岩和相关的隐爆角砾岩引起。热液蚀变矿物包括钾长石，绢云母，黄铁矿，绿泥石，山竹，碳酸盐，高岭石，萤石和石膏。矿石矿物以辉钼矿和黄铁矿为主，较少量的黄铜矿，方铅矿，白钨矿，黑钨矿，钛铁矿，次生辉石，原生金，闪锌矿和赤铁矿。硫化物矿物的δ〜（34）S组成范围为-6.0‰至+ 4.0‰。该矿床具有四个热液阶段：石英-钾长石（Ⅰ阶段），辉钼矿-石英（Ⅱ阶段），黄铁矿-绢云母。 -石英（阶段Ⅲ）和碳酸氢盐（阶段Ⅳ）。流体包裹体的热力学研究表明，流体在成矿过程中逐渐释放。每个成矿阶段夹杂物的均质温度，盐度和最小压力估算结果如下：（1）阶段Ⅰ：均质温度-203.7-525.8℃，盐度= 2.96-10.49和当量NaCl当量，最小压力为29.66 wt。％ = 101.9-196.2兆帕; （2）第二阶段：均质温度＝ 173.6-448.6℃，盐度＝ 1.81-9.74wt。％NaCl当量，最低压力＝ 93.1-172.0MPa。 （3）第三阶段：均质温度＝ 130.1〜386.0℃，盐度＝ 1.40〜9.73，Nad当量为34.07重量％，最小压力＝ 95.5〜142.5MPa。 （4）阶段Ⅳ：均质温度＝ 170-230℃，盐度＝ 0.18-5.71重量％NaCl当量。观察到各种流体包裹体均包含H_2O，CO_2，CH_4，SO_2，C_2H_2，C_2H_4，C_2H_6和（或）H_2S，以及包括盐石，钾盐，硬石膏，黄铜矿，赤铁矿，辉钼矿和钙锰矿的固体。热液的δ〜（18）O和8D分别在-4.4‰至+ 8.5‰和-81‰至-61‰之间。显微热力学和稳定的同位素数据表明，玉池岭钼矿床的成矿流体从早期岩浆演化为流水和岩浆水的混合物，最后发展到主要为后期的流水。辉钼矿的Re-Os年龄为131.2±1.4 Ma，与东部秦岭普遍认为的岩浆和相关成矿事件的131-112 Ma早期相吻合。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第ptab期|666-681|共16页
  • 作者

    Juan Zhang; Hui-shou Ye; Ke Zhou; Fang Meng;

  • 作者单位

    MLR Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China,School of the Earth Science and Mineral Resources, China University of Ceosciences, Beijing 100083, China;

    MLR Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;

    MLR Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;

    School of the Earth Science and Mineral Resources, China University of Ceosciences, Beijing 100083, China;

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  • 正文语种 eng
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  • 关键词

    Fluid inclusions; Stable isotopes; Re-Os geochronology; Porphyry Mo; Yuchiling; Qinling;

    机译：流体夹杂物;稳定同位素;Re-Os年代学;斑岩钼;鱼池岭;秦岭;

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