Controls on the porphyry Cu-Au mineralizing potential of magmas in continental collision settings

大陆碰撞背景下岩浆斑岩铜金矿化潜力的控制

• 批准号: 440924553
• 负责人: Dr. Andreas Audétat
• 金额: --
• 依托单位: Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik (BGI)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/440924553?language=en
• 关键词: Controls; porphyry; Cu; Au; mineralizing; Controls; porphyry; Cu; Au; mineralizing

The aim of this project is to evaluate the influence of magmatic factors on the porphyry Cu-Au mineralizing potential of magmas in continental collision settings. A popular view is that the high fertility of postcollisional, potassium-rich magmas stems from the partial melting of sulfide-rich cumulates that were deposited in the lower crust during a previous stage of subduction-related magmatism. This hypothesis will be tested using a dual approach that involves both experiments and studies on natural samples. In the experiments, natural, sulfide-bearing cumulates will be subjected to high pressures and temperatures to induce partial melting, and the obtained run products will be thoroughly characterized with regard to their composition, the oxygen fugacity, and the abundances of sulfur, H2O and metals in the silicate melt. The studies on natural samples aim at: (1) characterizing additional lower crustal cumulates that can be used as starting materials for the experiments, and (2) reconstructing the composition, formation conditions and metal content of a number of natural, postcollisional magmas associated with both mineralized and barren systems, such that the results can be directly compared with those obtained from the experiments.

该项目的目的是评估岩浆因子对岩浆在大陆碰撞环境中岩浆矿化潜力的影响。一个流行的观点是，后腐蚀，富含钾的岩浆的高生育能力源于在俯冲相关的岩浆岩岩岩岩岩岩岩的前阶段沉积在较低地壳中的富含硫化物的累积物的部分融化。该假设将使用涉及实验和自然样品研究的双重方法进行检验。在实验中，天然，含硫化物的累积物将受到高压和温度的诱导部分熔化，并且所获得的运行产物将在其组成，氧气散发性以及硅酸盐融合中的硫，H2O和金属方面得到彻底的特征。关于天然样品的研究的目的是：（1）表征可用作实验起始材料的其他下层地壳累积的表征，以及（2）重建许多天然，后岩浆的组合物，形成条件和金属含量，与矿化和贫瘠的系统相关，以便可以将结果直接与从实验室获得的结果进行比较。