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首页> 外文期刊>Journal of Asian earth sciences >A porphyry-skarn metallogenic system in the Lesser Xing'an Range, NE China: Implications from U-Pb and Re-Os geochronology and Sr-Nd-Hf isotopes of the Luming Mo and Xulaojiugou Pb-Zn deposits
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A porphyry-skarn metallogenic system in the Lesser Xing'an Range, NE China: Implications from U-Pb and Re-Os geochronology and Sr-Nd-Hf isotopes of the Luming Mo and Xulaojiugou Pb-Zn deposits

机译：中国东北小兴安岭斑岩-矽卡岩成矿系统：鹿鸣钼矿和徐老九沟铅锌矿床的U-Pb和Re-Os年代学以及Sr-Nd-Hf同位素的意义

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摘要

The Luming porphyry Mo deposit and the Xulaojiugou skarn Pb-Zn deposit are located in the southeast Lesser Xing'an Range, NE China. They are about 15 km apart, and are both related to monzogranite. Mo orebodies in the Luming deposit are hosted within the medium- to fine-grained monzogranite, while Pb-Zn orebodies in the Xulaojiugou deposit are hosted by the contact zone between the medium-grained monzogranite and the marbles of the early Cambrian Oianshan Formation. LA-ICP-MS zircon U-Pb dating of the ore-related monzogranite in the Luming deposit yields crystallization age of 180.7 ±1.6 Ma, and the medium-grained and porphyritic monzogranites from the Xulaojiugou deposit yield crystallization ages of 181.2 ±1.1 Ma and 179.9 ±1.0 Ma, respectively. Analyses of seven molybdenite samples from the Luming deposit display Re-Os isochron age of 177.9 ± 2.6 Ma. These results indicate that the mineralization in the Luming and Xulaojiugou deposits occurred at about 181-178 Ma. These two deposits are genetically linked and belong to a porphyry-skarn metallogenic system. Combined with the previously reported geochronological data for ore deposits in adjacent areas, we consider that the early Jurassic is an important epoch for Mo and Pb-Zn mineralization in the Lesser Xing'an Range. The monzogranites from the Luming and Xulaojiugou deposits are enriched in and Rb, Th, U, Pb and light rare earth elements (LREEs), and are depleted in Ba, Nb, Ta, P, Ti and Eu. They have positive ε_(Hf)(t) values of 1.0-4.0 with two-stage Hf model ages (T_(DM2)) of 868-1033 Ma. Whole-rock Sr and Nd isotopes show restricted ranges of initial compositions, with (~(87)Sr/~(86)Sr)_1 between 0.706346 and 0.707384 and ε_(Nd)(t) between -3.5 and -1.8. These data indicate that their primary magmas originated from the partial melting of a depleted lithospheric mantle which had been metasomatized by subducted slab-derived fluids/melts. The early Jurassic magmatic-metallogenic events in the Lesser Xing'an Range are interpreted as a response to the subduction of the Paleo-Pacific Plate.
机译：鹿鸣斑岩钼矿床和徐老九沟矽卡岩铅锌矿床位于中国东北小兴安岭东南。它们相距约15公里，并且都与辉长花岗岩有关。鹿鸣矿床中的钼矿体存在于中粒至细粒斑岩中，徐老九沟矿床中的Pb-Zn矿床则由中等粒度的辉石花岗岩与早寒武纪Oianshan组的大理石之间的接触带占据。鹿鸣矿床中与矿石有关的辉长花岗岩的LA-ICP-MS锆石U-Pb测年产生的结晶年龄为180.7±1.6 Ma，徐老九沟矿床中粒状和斑状的辉长岩的结晶年龄为181.2±1.1 Ma，分别为179.9±1.0 Ma。鹿鸣矿床的七个辉钼矿样品的分析显示Re-Os等时年龄为177.9±2.6 Ma。这些结果表明鹿鸣和徐老九沟矿床的矿化发生在大约181-178 Ma。这两个矿床具有遗传联系，属于斑岩-矽卡岩成矿系统。结合先前报道的邻近地区矿床的地质年代数据，我们认为侏罗纪早期是小兴安岭钼和铅锌矿化的重要时期。鹿鸣和徐老九沟矿床的辉长花岗岩富含Rb，Th，U，Pb和轻稀土元素（LREEs），而Ba，Nb，Ta，P，Ti和Eu贫化。它们的正ε_（Hf）（t）值为1.0-4.0，两阶段Hf模型年龄（T_（DM2））为868-1033 Ma。整个岩石的Sr和Nd同位素显示出有限的初始组成范围，其中（〜（87）Sr /〜（86）Sr）_1在0.706346和0.707384之间，而ε_（Nd）（t）在-3.5和-1.8之间。这些数据表明，它们的主要岩浆起源于枯竭的岩石圈地幔的部分融化，该地幔已被俯冲的板状流体/熔体交代。小兴安岭侏罗纪早期岩浆成矿事件被解释为对古太平洋板块俯冲的一种反应。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第15期|88-100|共13页
  • 作者

    Xinlu Hu; Zhenju Ding; Mouchun He; Shuzhen Yao; Bopeng Zhu; Jun Shen; Bin Chen;

  • 作者单位

    Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, PR China;

    Faculty of Earth Resources, China University of Geosciences, No. 388 Lumo Road, Hongshan District, Wuhan 430074, PR China;

    Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, PR China,State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Wuhan 430074, PR China;

    Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, PR China,Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, Wuhan 430074, PR China;

    Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, PR China;

    Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, PR China;

    Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, PR China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    U-Pb geochronology; Re-Os geochronology; Sr-Nd-Hf isotopes; Luming deposit; Xulaojiugou deposit; Lesser Xing'an Range;

    机译：铀铅年代学Re-Os年代学;Sr-Nd-Hf同位素;鹿鸣矿床;徐老九沟存款;小兴安岭;

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