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首页> 外文期刊>Journal of Asian earth sciences >Multiple-stage tungsten mineralization in the Silurian Jiepai W skarn deposit, South China: Insights from cathodoluminescence images, trace elements, and fluid inclusions of scheelite
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Multiple-stage tungsten mineralization in the Silurian Jiepai W skarn deposit, South China: Insights from cathodoluminescence images, trace elements, and fluid inclusions of scheelite

机译：华南志留系界牌W矽卡岩矿床的多阶段钨矿化：阴极发光图像，微量元素和白钨矿流体包裹体的见解

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摘要

The Jiepai deposit, located in the northeastern part of the Miao'ershan-Yuechengling batholith, South China, is characterized by predominant skarn mineralization that formed near the contact between the Silurian biotite granites and the Upper Cambrian carbonate rocks. Jiepai scheelites are recognized as two main generations based on their occurrences, cathodoluminescence (CL) signatures, and REE systematics. Prograde skarn-hosted scheelite I has uniformly dark CL characteristics and LREE-enriched patterns. Retrograde skarn-hosted scheelite Ha is homogeneously dark under CL, and has a slightly MREE-enriched pattern, whereas quartz vein-hosted scheelite IIb is delineated by fine oscillatory CL zones and a relatively flat REE pattern. Additionally, the CL images reveal that both scheelite I and II were modified by later-stage hydrothermal overprints, which occur as ubiquitous overgrowth rims and cutting veins with bright CL signatures, low REE, but similar REE patterns to their precursors. The compositional variations and fluid inclusions in Jiepai scheelites identify episodic pulses of hydrothermal fluids with different properties. The ore-forming fluids with high Nb/Ta, but low Nb, Ta and REY in the early retrograde stage are featured by moderate to high temperature and low to moderate salinity. Under relatively oxidizing conditions, they interacted with the host rock and underwent boiling to precipitate scheelite I. By contrast, the fluids with higher Nb, Ta and REY, but lower Nb/Ta in the late retrograde stage have slightly lower temperature and higher salinity. We therefore speculate that scheelite II may deposit from later magmatic fluids that have experienced continued boiling in more reducing environment.
机译：揭牌矿床位于中国南方的妙儿山-月城岭基岩的东北部，其特征是在志留纪黑云母花岗岩与上寒武统碳酸盐岩之间的接触附近形成了主要的矽卡岩矿化。界牌白垩岩根据其发生被认为是两个主要的世代，即阴极发光（CL）标记和REE系统学。渐进的矽卡岩型白钨矿I具有均匀的深色CL特征和富含LREE的图案。逆行的矽卡岩型白钨矿Ha在CL之下呈均匀黑色，并具有稍微MREE富集的图案，而石英脉状的白钨矿IIb由精细的振荡CL带和相对平坦的REE模式描绘。此外，CL图像显示白钨矿I和II均被后期热液叠印所修饰，后者以普遍的过度生长轮缘和明亮的CL特征，低REE，但与前驱体相似的REE切割脉出现。揭牌闪锌矿中的成分变化和流体包裹体识别出具有不同性质的热液流体的间歇脉冲。 Nb / Ta含量高，而Nb / Ta和REY含量低的成矿流体在逆行初期具有中等至高温和低度至中度盐度的特征。在相对氧化的条件下，它们与主体岩石相互作用，经过沸腾使白钨矿I沉淀。相比之下，Nb，Ta和REY含量较高，但在逆行后期的Nb / Ta含量较低的流体，其温度和盐度略低。因此，我们推测白钨矿II可能会从后来在更还原的环境中持续沸腾的岩浆流体中沉积出来。

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  • 来源
    《Journal of Asian earth sciences》 |2019年第1期|103898.1-103898.22|共22页
  • 作者

    Li Jiadai; Li Xiaofeng; Xiao Rong;

  • 作者单位

    Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, 19 Beitucheng Western Rd, Beijing 100029, Peoples R China|Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China|Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China;

    Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, 19 Beitucheng Western Rd, Beijing 100029, Peoples R China|Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China|Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China;

    Hunan Inst Geol Survey, Changsha 410116, Hunan, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Scheelite; In-situ trace elements; Fluid inclusions; Silurian W skarn deposit; South China;

    机译：硅藻土;原位痕量元素;流体夹杂物;Silurian W Skarn押金;华南;

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