Contrasting tectonic and magmatic signatures of convergent margin magmas associated with porphyry Cu versus iron oxide-copper-gold deposits

铜和金是工业和社会上重要的金属，通常从矿藏中提取。 形成于汇聚的板块边缘，可在南美洲和北美的科迪勒拉西部发现， 包括在加拿大。斑岩型铜钼金和铁氧化物铜金两类重要矿床 沉积(IOCG)既有相似之处，也有重要的区别，通常不会在时间上一起出现 和空间。这两种类型的矿床都与从岩浆中喷出的热液有关，似乎形成了 通过大体相似的过程。然而，大多数目前的研究认为，矿床类型是无关的， 不同的、有时是高度反差的成矿模型。 在智利，斑岩和IOCG矿床相距很近，但并不重叠。极佳的曝光率和 该地区受良好约束的构造历史允许对这些地区的地质背景进行高度控制 押金。我们对已公布数据的初步评估表明，在它们的 可以观察到与记录的构造环境变化相关的地球化学。 在这项建议中，我们的目标是通过使用以下矿物来更深入地探讨这些地球化学对比 锆石、磷灰石和铁钛氧化物，以限制氧、硫和水的逸出性。我们会 检验这样一种假设，即与这两种不同的岩浆有关的主要差异之一 矿床类型是其硫含量，反映了不同的岩浆来源和熔融条件。 更好地了解有利于形成的构造和岩浆环境的对比 斑岩和IOCG矿床将在研究较少的地区通知和限制这类矿床的勘探。 加拿大科迪勒拉等地区。

Copper and gold, industrially and societally important metals, are commonly extracted from ore deposits formed at convergent plate margins, and can be found in the western Cordilleras of South and North American, including in Canada. Two important classes of such deposits, porphyry Cu±Mo±Au and iron oxide-copper-gold deposits (IOCG) have similarities but also important differences, and do not typically occur together in time and space. Both deposit types can be related to hydrothermal fluids exsolved from magmas, and seem to form by broadly similar processes. However, most current research treats the deposit types as unrelated, with distinct, and sometimes highly contrasting models for ore formation. In Chile, porphyry and IOCG deposits occur in close but not overlapping proximity. Excellent exposure and the well-constrained tectonic history of this region permit a high level of control on the geological context of these deposits. Our preliminary assessment of published data indicates that clear but subtle differences in their geochemistry can be observed, which correlate with documented changes in tectonic setting. In this proposal, we aim to probe more deeply into these geochemical contrasts by using minerals such as zircon, apatite, and Fe-Ti oxides to provide constraints on the fugacities of oxygen, sulfur, and water. We will test the hypothesis that one of the main differences between magmas associated with these two different deposit types is their sulfur content, which in turn reflects different magmatic sources and melting conditions. A better understanding of the contrasting tectonic and magmatic settings conducive to the formation of porphyry and IOCG deposits will inform and constrain exploration for such deposits in less well studied regions such as the Canadian Cordillera.