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江西新余良山钼矿氢-氧-硫-铅同位素特征及指示意义

伍俊杰 陈正乐 付蕾 潘家永 韩凤彬 沈滔

伍俊杰, 陈正乐, 付蕾, 等, 2016. 江西新余良山钼矿氢-氧-硫-铅同位素特征及指示意义. 地质力学学报, 22 (2): 325-337.
引用本文: 伍俊杰, 陈正乐, 付蕾, 等, 2016. 江西新余良山钼矿氢-氧-硫-铅同位素特征及指示意义. 地质力学学报, 22 (2): 325-337.
WU Jun-jie, CHEN Zheng-le, FU Lei, et al., 2016. H-O-S-Pb ISOTOPIC COMPONENTS OF THE LIANGSHAN MOLYBDENUM DEPOSIT IN XINYU, JIANGXI PROVINCE AND THEIR IMPLICATIONS FOR THE ORE FORMING PROCESS. Journal of Geomechanics, 22 (2): 325-337.
Citation: WU Jun-jie, CHEN Zheng-le, FU Lei, et al., 2016. H-O-S-Pb ISOTOPIC COMPONENTS OF THE LIANGSHAN MOLYBDENUM DEPOSIT IN XINYU, JIANGXI PROVINCE AND THEIR IMPLICATIONS FOR THE ORE FORMING PROCESS. Journal of Geomechanics, 22 (2): 325-337.

江西新余良山钼矿氢-氧-硫-铅同位素特征及指示意义

基金项目: 

国家自然基金项目 U1403292

中国地质调查局地质调查项目 121201120936

"十二五"国家科技支撑计划项目 2015BAB05B04

详细信息
    作者简介:

    伍俊杰(1990-), 男, 江西抚州人, 硕士研究生, 地质学专业。E-mail:mary_wu901230@sina.com

  • 中图分类号: P618.65

H-O-S-Pb ISOTOPIC COMPONENTS OF THE LIANGSHAN MOLYBDENUM DEPOSIT IN XINYU, JIANGXI PROVINCE AND THEIR IMPLICATIONS FOR THE ORE FORMING PROCESS

  • 摘要: 在前人研究成果的基础上,对江西新余良山钼矿床的地质特征进行了详细研究,系统测试了矿床中石英脉型钼矿石样品的氢、氧、硫和铅同位素组成,进而探讨钼矿床的成矿流体性质以及成矿物质来源。良山钼矿床δD值变化范围-61‰~ -57.9‰,平均值-59.1‰;δ18OV-SMOW值变化于7.1‰~10.5‰,平均值9.2‰,流体的δ18OH2O值变化于-3.32‰~-0.52‰,平均值-1.52‰,表明成矿流体具有岩浆水和大气降水混合流体特征。硫化物的δ34SV-CDT值为-1.8‰~2.6‰,极差4.4‰,平均值1.12‰,其中黄铁矿δ34SV-CDT值为-1.8‰~2.6‰,辉钼矿δ34SV-CDT值为0.8‰~2.3‰,硫同位素表现为较小的正值特征,具有典型的岩浆硫组成特点。良山钼矿石中的矿石铅同位素206Pb/204Pb值为17.555~19.474,207Pb/204Pb值15.486~15.768,208Pb/204Pb值37.942~39.943,μ值9.35~9.7,ω值37.06~38.31,Th/U值3.8~3.96,矿石铅为混合铅,表明成矿物质为混合来源。良山钼矿床应为岩浆热液型-石英脉型钼矿床,是中生代华南板块板内构造演化区域金属成矿作用大爆发的产物。

     

  • 图  1  江西新余铁矿田地质图(据文献[14]略改)

    Figure  1.  Geological map of the Xinyu iron deposit in Jiangxi Province

    图  2  江西新余良山钼矿床地质简图(据文献[12]略改)

    Figure  2.  Geological map of the Liangshan molybdenum deposit in Xinyu, Jiangxi Province

    图  3  良山钼矿床矿石形态及镜下特征图片

    a—良山钼矿野外露头照片;b—含矿石英脉;c—辉钼矿与钾长石化;d—辉钼矿与硅化;e—石英脉型钼矿石;f—黄铁矿化、黄铜矿化及辉钼矿交代残留;g—辉钼矿纤维状结构

    Figure  3.  Morphological and microscopical characteristics of ores in the Liangshan molybdenum deposit

    图  4  新余良山钼矿δ18OH2O-δD同位素投影图(底图据文献[21])

    Figure  4.  The projection graph of δ18OH2O vs. δD of the Liangshan molybdenum deposit

    图  5  良山钼矿床H-O同位素组成与天然H-O同位素对比图解(底图据文献[25])

    Figure  5.  Contrast of H-O isotopic compositions in Liangshan molybdenum deposit and in nature

    图  6  江西新余良山钼矿硫同位素直方图

    Figure  6.  Frequency histogram of δ34SV-CDT in ore sulfides from Liangshan molybdenum deposit in Xinyu, Jiangxi

    图  7  新余良山钼矿矿床铅同位素207Pb/204Pb-206Pb/204Pb模式图(底图据文献[23])

    A—地幔; B—造山带; C—上地壳; D—下地壳

    Figure  7.  The mode pattern of 207Pb/204Pb-206Pb/204Pb for the Liangshan molybdenum deposit in Xinyu, Jiangxi Province

    图  8  新余良山钼矿矿石铅同位素构造环境演化图解(A,B,C,D分别为各区域中样品相对集中区)

    LC—下地壳; UC—上地壳; OIV—洋岛火山岩; OR—造山带

    Figure  8.  The lead isotope diagram of tectonic environment evolution in Liangshan molybdenum deposit in Xinyu, Jiangxi Province

    表  1  江西新余良山钼矿矿床石英氢、氧同位素组成

    Table  1.   Hydrogen and oxygen isotopic compositions of the Liangshan molybdenum deposit in Xinyu, Jiangxi

    样品号矿物检测结果
    δDV-SMOW/‰δ18OV-PDB/‰δ18OV-SMOW/‰δ18OH2O/‰Th/℃
    JX1-7石英-61.0-19.810.5-0.79206.5
    JX1-8石英-59.6-21.19.2-0.52234.2
    JX1-9石英-58.9-21.58.8-2.01214.0
    JX1-11石英-57.9-23.07.1-0.92221.4
    JX1-12石英-58.2-20.89.5-3.32221.4
    注:样品测试在核工业北京地质研究院分析测试研究中心完成
    下载: 导出CSV

    表  2  江西新余良山钼矿床硫同位素组成

    Table  2.   Sulfur isotopic composition of the Liangshan molybdenum deposit in Xinyu, Jiangxi Province

    样品号矿物δ34SV-CDT/‰
    JX1-7黄铁矿2.6
    JX1-7-h辉钼矿2.0
    JX1-8辉钼矿2.3
    JX1-9黄铁矿1.2
    JX1-10辉钼矿2.1
    JX52-3黄铁矿1.9
    JX52-4B黄铁矿0.8
    JX52-4C黄铁矿-0.3
    JX52-5B黄铁矿-1.8
    JX52-6A黄铁矿1.8
    JX52-6B黄铁矿-0.3
    JX52-6B-h辉钼矿0.8
    JX53-2A黄铁矿1.3
    JX53-2C黄铁矿1.3
    注:样品测试在核工业北京地质研究院分析测试研究中心完成
    下载: 导出CSV

    表  3  中文江西新余良山钼矿床铅同位素组成标题

    Table  3.   Lead isotopic composition of the Liangshan molybdenum deposit in Xinyu, Jiangxi Province

    样品号矿物208Pb/204Pb207Pb/204Pb206Pb/204Pbt/MaμωTh/U△α△β△γ
    JX52-3黄铁矿38.93115.63018.5081339.5138.273.8976.5419.8544.79
    JX52-4B黄铁矿38.67215.60618.3652079.4837.783.8673.9818.6141.09
    JX52-4C黄铁矿37.94215.48617.5556489.3538.283.9661.9713.2741.09
    JX52-5B黄铁矿38.43015.58018.2722439.4437.063.8071.3217.0836.14
    JX52-6A黄铁矿38.72215.62018.4901349.4937.423.8275.5419.2039.20
    JX52-6B黄铁矿39.94315.76819.474-3999.7038.313.82122.1028.3265.98
    JX52-6B-h辉钼矿38.50315.57418.2572469.4337.393.8470.7216.7038.26
    JX53-2A黄铁矿38.20015.54817.9454419.4237.663.8767.9416.0138.71
    JX53-2C黄铁矿38.14915.53217.913444.69.3937.473.8666.3714.9937.51
    注:样品测试在核工业北京地质研究院分析测试研究中心完成;μ=w(238U)/w(204Pb),ω=w(232Th)/w(204Pb);计算结果由Geokit软件计算所得;t为硫化物模式年龄
    下载: 导出CSV
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  • 收稿日期:  2015-11-02
  • 刊出日期:  2016-06-28

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