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首页> 外文期刊>Journal of Asian earth sciences >Geochronology and trace element geochemistry of titanite in the Machangqing Cu-Mo-dominated polymetallic deposit, Yunnan Province, southwest China
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Geochronology and trace element geochemistry of titanite in the Machangqing Cu-Mo-dominated polymetallic deposit, Yunnan Province, southwest China

机译：中国云南省马昌清市铜钼为主的多金属矿床中钛矿的地质年代学和微量元素地球化学

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摘要

The Machangqing Cu-Mo-dominated polymetallic deposit is a porphyry-skarn-epithermal Cu-Mo (-Au) metallogenic system located in the middle part of the Jinshajiang-Ailaoshan alkaline porphyry metallogenic belt. The skarn mineralization of the Machangqing deposit mainly occurs along the contacts between the alkalic porphyry intrusions and the surrounding Lower Ordovician Xiangyang Formation rocks. We present LA-ICP-MS U-Pb ages and trace element data for titanite from the Machangqing deposit in order to investigate the origin of this deposit. Based on mineral textures and assemblages, two types of titanite are recognized in Machangqing: magmatic titanite (Type I) from the granite porphyry and hydrothermal titanite from the mineralized skarn. The coarse-grained magmatic titanite is euhedral and occurs as discrete grains in the interstices of feldspar, quartz and biotite, whereas fine- to medium-grained hydrothermal titanite crystals (Type II) are euhedral to subhedral and occur in association with skarn minerals such as garnet, pyroxene and magnetite. Magmatic titanite has lower FeO, Al2O3, F and Nb/Ta but higher TiO2, Th/U, HFSEs and Lu/Hf than hydrothermal titanite. The magmatic titanite has higher LREE/HREE ratios and total REE contents with stronger negative Eu anomalies than its mineralized skarn counterpart. Trace elemental characteristics of hydrothermal titanite in Machangqing are consistent with relatively low F contents and oxygen fugacities when compared to the neighboring Beiya gold-dominated polymetallic deposit in the same metallogenic belt. The weighted average Pb-206/U-238 age of 34.3 +/- 1.2 Ma of hydrothermal titanite is within error but slightly younger than the age of magmatic titanite (37.5 +/- 4.1 Ma), indicating that the skarn mineralization followed the emplacement of the granite porphyry and was broadly coeval with the porphyry mineralization. The porphyry and skarn types of mineralization at Machangqing were formed from the same metallogenic system. Different ore-forming conditions, such as oxygen fugacities and F contents, might be responsible for different metal enrichments at the Machangqing and Beiya deposits.
机译：马厂庆铜钼为主的多金属矿床是斑岩-矽卡岩-上热型铜钼（-Au）成矿系统，位于金沙江-哀牢山碱性斑岩成矿带的中部。马厂庆矿床的矽卡岩矿化主要发生在碱性斑岩侵入体与周围的下奥陶统向阳组岩之间的接触上。我们提供了Machangqing矿床中钛铁矿的LA-ICP-MS U-Pb年龄和微量元素数据，以调查该矿床的成因。根据矿物的质地和组合，在马场庆地区可以识别出两种类型的钛矿：花岗岩斑岩中的岩浆钛矿（I型）和矿化矽卡岩中的热液钛矿。粗粒岩浆钛矿为浅色，在长石，石英和黑云母的间隙中以离散晶粒的形式出现，而细粒至中粒的热液钛矿晶体（II型）为浅色至半面状，并与矽卡岩矿物如石榴石，辉石和磁铁矿。岩浆钛矿的FeO，Al2O3，F和Nb / Ta含量较低，而TiO2，Th / U，HFSE和Lu / Hf含量较高。岩浆钛矿具有比其矿化矽卡岩对应的更高的LREE / HREE比和总REE含量，且具有更强的负Eu异常。与同一成矿带中邻近的北亚金为主的多金属矿床相比，马场庆热液钛矿的痕量元素特征与相对较低的F含量和氧逸度相一致。热液钛矿的Pb-206 / U-238加权平均年龄为34.3 +/- 1.2 Ma，处于误差范围内，但比岩浆钛矿的年龄（37.5 +/- 4.1 Ma）稍年轻，表明矽卡岩矿化随位而定花岗岩斑岩，与斑岩矿化大致相同。 Machangqing的斑岩和矽卡岩矿化类型是由相同的成矿系统形成的。在Machangqing和Beiya矿床中，不同的成矿条件（例如，氧气逸度和F含量）可能导致了不同的金属富集。

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  • 来源
    《Journal of Asian earth sciences》 |2018年第1期|398-414|共17页
  • 作者

    Fu Yu; Sun Xiaoming; Hollings Pete; Li Dengfeng; Yang Tianjian;

  • 作者单位

    Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510006, Guangdong, Peoples R China;

    Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510006, Guangdong, Peoples R China;

    Lakehead Univ, Dept Geol, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada;

    Sun Yat Sen Univ, Sch Marine Sci, Guangzhou 510006, Guangdong, Peoples R China;

    Guangdong Prov Key Lab Marine Resources & Coastal, Guangzhou 510275, Guangdong, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Titanite; UPb dating; Trace elements; Machangqing; Sanjiang area;

    机译：钛矿;UPb定年;痕量元素;马厂庆;三江地区;

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