Magmatic Controls on Au/Cu Ratios in Porphyry Ore Fluids: Constraints From Crystal-Melt Experimentation

9909576坎德拉一些含铜、金矿床，如许多斑岩型、矽卡岩型和席状脉型矿床，在空间和时间上与中长英质侵入岩有关。 然而，这些矿床中Cu/Au比值的控制因素尚不清楚。 我们建议从一个方面研究Cu和Au的岩浆行为，这可以揭示矿石的Cu/Au如何受到岩浆参数的影响。 在本研究中，我们将探讨铜和Au在磁铁矿、黑云母和熔体中的分配。 将在一定温度和压力范围内对磁铁矿和黑云母进行实验。 氧逸度也将在实验中变化。 我们将结合联合收割机的研究结果与我们公布的结果之间的硫化物矿物和熔体的分配的铜和Au的影响，螯合的矿石金属的侵入有关的矿流体的Au/Cu比率。

9909576CandelaSome Cu and Au-bearing ores, such as many porphyry, skarn and sheeted vein-type deposits, are related spatially and temporally to intermediate to felsic intrusive igneous rocks. However, the controls on the Cu to Au ratio in these deposits are not clear. We propose to study one aspect of the magmatic behavior of Cu and Au that can shed light on how Cu/Au of ore can be affected by magmatic parameters. In the proposed research, we will investigate the partitioning of Cu and Au among the phases magnetite, biotite and melt. Experiments on magnetite and biotite will be conducted over a range of temperatures and pressures. The oxygen fugacity will also be varied in the experiments. We will combine the results of the proposed research with our published results on the partitioning of Cu and Au between sulfide minerals and melt to evaluate the effect of the sequestering of ore metals on the Au/Cu ratios of intrusion-related ore fluids.