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首页> 外文期刊>Contributions to Mineralogy and Petrology >Constraints on the source of Cu in a submarine magmatic-hydrothermal system, Brothers volcano, Kermadec island arc
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Constraints on the source of Cu in a submarine magmatic-hydrothermal system, Brothers volcano, Kermadec island arc

机译：在潜艇Magmatic-Hymerothermal系统中的Cu来源限制，Kermadec Island arc

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Most magmatic-hydrothermal Cu deposits are genetically linked to arc magmas. However, most continental or oceanic arc magmas are barren, and hence new methods have to be developed to distinguish between barren and mineralised arc systems. Source composition, melting conditions, the timing of S saturation and an initial chalcophile element-enrichment represent important parameters that control the potential of a subduction setting to host an economically valuable deposit. Brothers volcano in the Kermadec island arc is one of the best-studied examples of arc-related submarine magmatic-hydrothermal activity. This study, for the first time, compares the chemical and mineralogical composition of the Brothers seafloor massive sulphides and the associated dacitic to rhyolitic lavas that host the hydrothermal system. Incompatible trace element ratios, such as La/Sm and Ce/Pb, indicate that the basaltic melts from L'Esperance volcano may represent a parental analogue to the more evolved Brothers lavas. Copper-rich magmatic sulphides (Cu 2 wt%) identified in fresh volcanic glass and phenocryst phases, such as clinopyroxene, plagioclase and Fe-Ti oxide suggest that the surrounding lavas that host the Brothers hydrothermal system represent a potential Cu source for the sulphide ores at the seafloor. Thermodynamic calculations reveal that the Brothers melts reached volatile saturation during their evolution. Melt inclusion data and the occurrence of sulphides along vesicle margins indicate that an exsolving volatile phase extracted Cu from the silicate melt and probably contributed it to the overlying hydrothermal system. Hence, the formation of the Cu-rich seafloor massive sulphides (up to 35.6 wt%) is probably due to the contribution of Cu from a bimodal source including wall rock leaching and magmatic degassing, in a mineralisation style that is hybrid between Cyprus-type volcanic-hosted massive sulphide and subaerial epithermal-porphyry deposits.
机译：大多数岩浆 - 水热Cu沉积物与弧形岩浆遗传连接。然而，大多数大陆或海洋弧磁带贫瘠，因此必须开发新方法以区分贫瘠和矿化电弧系统。源组成，熔化条件，S饱和度的时序和初始碳酸化合物元素浓缩代表了控制俯冲设定潜力的重要参数，以举办经济上有价值的押金。 KermadeC岛的兄弟火山弧是与电弧相关潜艇岩浆水热活动的最佳学习示例之一。这项研究首次比较了兄弟海底大量硫化物的化学和矿物学组成和托管水热系统的相关霉菌的化学和矿物学组成。不相容的痕量元素比例，如la / sm和ce / pb，表明L'eSperance火山的玄武岩熔体可能代表父母的类似物，以更新的兄弟斯瓦马州。在新鲜的火山玻璃和苯杂交相中鉴定的富含铜的岩硫化物（Cu＆ 2wt％），例如临床，Plagioclase和Fe-Ti氧化物，表明举办兄弟水热系统的周围熔岩代表了潜在的Cu来源硫化物矿石在海底。热力学计算揭示了兄弟融化在他们的演变期间达到了挥发性饱和度。熔融包合物数据和诸如囊泡边缘的硫化物的发生表明，从硅酸盐熔体中提取Cu的渗透挥发相并且可能导致覆盖水热系统。因此，富含Cu的海底硫化物（高达35.6wt％）的形成可能是由于Cu从具有壁岩浸出和岩浆脱气的双峰源的贡献，在塞浦路斯型之间的杂交风格中托管大型硫化物和子系统术术 - 斑岩矿床。

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