Dynamics of Ore MEtal TRansport in Alkaline Porphyry systems (DOMETRAP)

我们的项目旨在研究矿石金属在碱性斑岩-浅热液系统中的详细输运机制，包括它们的途径和载体。这项研究将集中于利希尔（巴布亚新几内亚）的Ladolam矿床，它是这类矿床中最大和最具代表性的矿床之一。在Lihir以南，一个年轻的海底火山场被解释为拉多兰火山系统的早期模拟物。只有在这里，演化程度较低的岩石和bbb10 ~ 1km水深的喷发，才有可能研究岩浆系统中受岩浆分异和地壳浅层脱气影响最小的金属运输。锥形海山发育类似Ladolam的热液型成矿作用，附近Tubaf海山熔岩中有大量记录从地幔源到喷发的火成岩过程的地幔和地壳包体。我们的研究重点是详细重建熔体上升过程中的热气压演化，以及它如何影响熔体氧化态和岩浆的金属运输能力。为此，我们计划将岩石样品的岩石学和地球化学的初步基本特征与挥发物和痕量金属的高精度分析以及使用流体和玻璃（以前的熔融）包裹体的微温压测量相结合。有了这些数据，我们的目标是提高对触发次火山侵入或火山爆发的机制的理解。将这些见解与这些硅不饱和、高碱性岩浆的演化整合到深部岩浆管道系统中具有重要的意义，这些岩浆已被证明是形成具有重要经济意义的斑岩系统的高度肥沃的岩浆。此外，我们对熔体停滞压力、上升速率、喷发触发因素和潜在的熔体挥发析出深度的限制将直接用于PD Philipp Weis博士领导的一个项目，该项目旨在模拟Ladolam斑岩形成的物理特性。SPP 2238项目的进一步链接由Andreas aud<e:1>博士提供，该项目侧重于与大陆环境中碱性斑岩有关的岩石学实验。

Our project aims at investigating the detailed transport mechanisms of ore metals including their pathways and carriers in alkaline porphyry-epithermal systems. The study will focus on the Ladolam deposit on Lihir (Papua New Guinea) representing one of the largest and most representative deposits of this kind. South of Lihir, a young submarine volcanic field has been interpreted as an early analogue of the volcanic system hosting Ladolam. Only here, less evolved rocks and eruption at >1 km water depth allow to study the metal transport in the magmatic system least affected by magmatic differentiation and degassing at shallow crustal levels. Epithermal-style mineralization similar to Ladolam occurs at Conical Seamount and mantle and crustal xenoliths recording igneous processes from the mantle source to eruption are abundant in lavas from the nearby Tubaf Seamount. Our research project focuses on a detailed reconstruction of the thermobarometric evolution during melt ascent and how it affects melt oxidation state and metal transport capability of the magma. For this purpose, we plan to combine the initial basic characterization of the petrology and geochemistry of the rock samples with the high-precision analyses of volatiles and trace metals and microthermobarometry using fluid and glass (formerly melt) inclusions. With this data we aim at an improved understanding of the mechanisms that trigger subvolcanic intrusions or volcanic eruptions in this specific setting. Integrating these insights into the deep magmatic plumbing system with the evolution of these silica-undersaturated, highly alkaline magmas that have been proven to be highly fertile for the formation of economically important porphyry systems is of great relevance. Furthermore, our constraints on the pressures of melt stagnation, ascent rates, eruptions triggers and potentially melt-volatile exsolution depth will feed directly into a project led by PD Dr. Philipp Weis that aims at modelling the physical properties of porphyry formation at Ladolam. Further links within the SPP 2238 are provided to the project by Dr. Andreas Audétat that focuses on petrological experiments related to alkaline porphyries in continental settings.