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The efficiency of copper extraction from magma bodies: Implications for mineralization potential and fluid-silicate melt partitioning of copper
American Mineralogist ( IF 3.1 ) Pub Date : 2022-09-01 , DOI: 10.2138/am-2021-7951
Jin-Sheng Zhou, Qiang Wang, Derek A. Wyman, Zhen-Hua Zhao, Le Zhang, Peng-Li He

Multiple factors may downgrade the mineralization potential of an intermediate-felsic intrusion, such as the commonly invoked inefficient fluid exsolution and lack of ore-forming species (metals and their ligands) in magmas. However, other factors may affect the mineralization potential of a magma body but have poorly understood roles in the formation of magmatic-hydrothermal ore deposits. Here, we present a comparison between two Cu mineralizing plutons and a Cu-poor, Fe mineralizing pluton in the Edong district. Efficient fluid exsolution and extraction occurred during the solidification of all three plutons, as evidenced by extensive skarn alteration around them. The results show that the oxidation state of the three plutons is similar (within a range of ~ΔNNO+0.9 to ΔNNO+2.5). A systematic comparison of the Cu contents of a certain suite of minerals of the three plutons shows that the Cu concentrations of all minerals in the Cu mineralizing plutons are lower than those of the Cu-poor Fe mineralizing pluton. This indicates that the Cu mineralizing plutons underwent more efficient copper extraction. Thus, igneous crystals with anomalously low Cu contents may potentially be used as a tool to identify Cu mineralizing magmatic units in a deposit with multiphase intrusions. We suggest that the inefficient copper extraction from plutons may be ascribed to the lack of reduced S species during fluid exsolution or different evolution paths of Cu and Cl during magma crystallization.

中文翻译:

从岩浆体中提取铜的效率:对铜的矿化潜力和流体硅酸盐熔体分配的影响

多种因素可能会降低中长英质侵入体的成矿潜力,例如通常引用的低效流体溶出和岩浆中缺乏成矿物种(金属及其配体)。然而,其他因素可能会影响岩浆体的成矿潜力,但对岩浆热液矿床形成的作用却知之甚少。在这里,我们比较了鄂东地区两个铜矿化岩体和一个贫铜、铁矿化岩体。在所有三个岩体的凝固过程中都发生了有效的流体溶解和提取,这可以从它们周围的广泛矽卡岩蚀变中得到证明。结果表明,三个岩体的氧化态相似(在~ΔNNO+0.9到ΔNNO+2.5的范围内)。对三种岩体中某组矿物的Cu含量进行系统比较表明,Cu矿化岩体中所有矿物的Cu含量均低于贫铜Fe矿化岩体。这表明铜矿化岩体经历了更有效的铜提取。因此,具有异常低 Cu 含量的火成晶体可能被用作识别具有多相侵入的矿床中的 Cu 矿化岩浆单元的工具。我们认为从岩体中提取铜的效率低下可能是由于在流体溶出过程中缺乏还原的 S 物种或在岩浆结晶过程中 Cu 和 Cl 的不同演化路径。
更新日期:2022-09-01
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