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首页> 外文期刊>Journal of Asian earth sciences >Origin of the Triassic Qilinchang Pb-Zn deposit in the western Yangtze block, SW China: Insights from in-situ trace elemental compositions of base metal sulphides
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Origin of the Triassic Qilinchang Pb-Zn deposit in the western Yangtze block, SW China: Insights from in-situ trace elemental compositions of base metal sulphides

机译：中国西南扬子地块三叠系麒麟厂铅锌矿床的成因：贱金属硫化物原位微量元素组成的见解

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摘要

The Qilinchang Pb-Zn deposit (5Mt of sulphide ore at mean grades of 2.3-9.2% Pb and 2.7-22.5% Zn) is hosted in Early Carboniferous carbonate rocks and mainly controlled by NE-, NS-, and NW- trending structural belts between the Xlaojiang and Zhaotong-Qujing buried faults. Ore minerals are sphalerite, galena, pyrite, chalco-pyrite, and marmatite, whereas gangue minerals are dolomite, calcite, and quartz. Three generations of pyrite are recognized; these include fine-grained anhedral pyrite (Py-I), medium-grained anhedral to subhedral hydrothermal pyrite (Py-II), and coarse-grained subhedral to euhedral hydrothermal pyrite (Py-III), while the sphalerite occurs in two forms as fine-grained intergrown with galena and associated with Py-I and Py-II.Laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis was performed to evaluate trace element compositions of pyrite and sphalerite from different generations of ores. Py-I has relatively higher concentrations of Mg, Mn, Co, Ni, and TI. Py-II in Cu, As, Se, Mo, and Sb relative to pyrite of other generations. The contents of trace elements in Py-III are variable but significantly enriched in Ti, V, Bi, Ag, and Pb compared to Py-I and Py-II. This variation indicates that these elements occur as micro mineral inclusions of possible Ag-Pb-bearing phases. Sphalerite of stage I has higher concentrations of Mn, Fe, Co, Ni, Cu, Ga, Ge, As, Ag, Cd, In, Sb, Hg, and Pb than stage II. These elements are homogeneously distributed in all samples analyzed. The incorporation of these elements is primarily through simple substitution mechanisms (e.g., 22n(2+) <-> Cu+ + In3+ ) as indicated from binary plots. Principal component analyses (PCA) applied to LA-ICP-MS dataset for pyrite reveal two main clusters; Py-I enriched in Ni, Co and As, Py-II and Py-III high in with V, Mn, Cu, Zn, Se, Mo, Ag, Sb, Au, and Bi. Likewise, the PCA also confirms two clusters of elements for sphalerite; Ge, Cu, As, Sb, Ag, Fe, and Cd corresponding to Sph-I and In, Sn, and Ga corresponding to Sph-II.Py-I has higher Co/Ni ratio ranging from 0.04 to 1.6 compared to Py-II and Py-III having Co/Ni ratios from 0 to 0.706 and 0 0.696, respectively. We report that the pyrites from the Qilinchang deposit have Co/Ni ratios slightly lower than typical Mississippi Valley-Type (MVT) deposits (0.2-7.2) and different from iron oxide copper-gold (IOCG) and porphyry Cu deposits. Considering these geochemical signatures, it can be suggested that the Qilinchang deposit was not related to magmatic activities. We thus propose that the ore-forming fluids responsible for the formation of the deposit were generated from a low-temperature environment, similar to typical MVT deposits.
机译：麒麟厂铅锌矿床（5Mt硫化物矿，铅平均品位为2.3-9.2％，锌品位为2.7-22.5％）位于早期石炭系碳酸盐岩中，主要受NE，NS和NW趋势构造带控制。 Xlaojiang和Zhaotong-Qujing之间的隐伏断层。矿石矿物为闪锌矿，方铅矿，黄铁矿，黄铜矿-黄铁矿和mar石，而脉石矿物为白云石，方解石和石英。可以识别出三代黄铁矿。这些包括细粒无水黄铁矿（Py-I），中粒无水热黄铁矿（Py-II）和粗粒亚湿热至正水热黄铁矿（Py-III），而闪锌矿以两种形式出现与方铅矿共生并与Py-I和Py-II相关联的细颗粒。进行了激光烧蚀电感耦合等离子体质谱（LA-ICP-MS）分析，以评估来自不同年代矿石的黄铁矿和闪锌矿的痕量元素组成。 Py-1具有相对较高的Mg，Mn，Co，Ni和TI浓度。相对于其他世代黄铁矿，Cu，As，Se，Mo和Sb中的Py-II。 Py-III中微量元素的含量是可变的，但与Py-I和Py-II相比，其Ti，V，Bi，Ag和Pb的含量显着丰富。这种变化表明这些元素以可能的含Ag-Pb的相的微矿物质夹杂物的形式出现。与阶段II相比，阶段I的闪锌矿具有较高的Mn，Fe，Co，Ni，Cu，Ga，Ge，As，Ag，Cd，In，Sb，Hg和Pb浓度。这些元素均匀分布在所有分析的样品中。这些元素的结合主要是通过简单的取代机制（例如22n（2+）-Cu + + In3 +）完成的，如二进制图所示。将黄铁矿应用于LA-ICP-MS数据集的主成分分析（PCA）揭示了两个主要簇。 Py-I富含Ni，Co和As，Py-II和Py-III富含V，Mn，Cu，Zn，Se，Mo，Ag，Sb，Au和Bi。同样，PCA还确认了闪锌矿的两个元素簇。与Sph-I相对应的Ge，Cu，As，Sb，Ag，Fe和Cd和Sph-II相对应的In，Sn和Ga.Py-I的Co / Ni比Py-I高，范围为0.04至1.6 II和Py-III的Co / Ni比分别为0至0.706和0 0.696。我们报告说，来自麒麟厂矿床的黄铁矿的Co / Ni比值略低于典型的密西西比河谷型（MVT）矿床（0.2-7.2），并且不同于氧化铁铜金（IOCG）和斑岩型铜矿床。考虑到这些地球化学特征，可以认为齐林场矿床与岩浆活动无关。因此，我们建议，负责矿床形成的成矿流体是从低温环境中产生的，类似于典型的MVT矿床。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第may1期|104292.1-104292.20|共20页
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  • 作者单位

    Chinese Acad Sci Inst Geochem State Key Lab Ore Deposit Geochem Guiyang 550081 Peoples R China|Univ Chinese Acad Sci Coll Earth & Planetary Sci Beijing 100049 Peoples R China;

    Chinese Acad Sci Inst Geochem State Key Lab Ore Deposit Geochem Guiyang 550081 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Pyrite; Sphalerite; Trace elements; LA-ICP-MS; Mississippi Valley-Type (MVT) deposit; Qilinchang;

    机译：黄铁矿;闪锌矿;微量元素;LA-ICP-MS;密西西比河谷型（MVT）矿床;麒麟场;

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