Behavior of chalcophile elements in subduction zone processes

本项目的主要目的是通过建立板块脱水/熔融、地幔楔部分熔融与地壳岩浆演化之间的定量联系，对俯冲带演化过程中亲铜元素的地球化学行为进行定量描述。这一目标将通过结合地球化学、实验岩石学和地球化学建模方面的创新方法来实现。为了克服目前在天然物质研究和实验模拟中缺乏数据的挑战，以及重新评估和扩展现有的地球化学模型，需要创新的方法来提高对俯冲带的认识。为了实现这些目标，我提出了一种多学科的方法，它结合了(1)弧系自然样品的地球化学和岩石学研究，(2)模拟俯冲带环境条件下亲铜元素行为的实验测定，以及(3)俯冲带过程的正演模拟。这些任务的结果将为我们对俯冲带中亲铜元素的地球化学提供一个新的详细的视角，覆盖我们长期以来的知识空白，并将为追踪不同来源的贡献、解释弧下过程和估计元素预算和循环提供精确的地球化学代理。

The main objective of this project is to propose a quantitative description of the chalcophile element geochemical behavior in the processes of subduction zone evolution by creating a quantitative link between dehydration/melting of the slab, partial melting of the mantle wedge, and magma evolution in the crust. This objective will be achieved by a combination of innovative approaches in geochemistry, experimental petrology and geochemical modelling. The innovative ways to progress in the understanding of subduction zones are required to overcome current challenges and lack of data in the investigations of natural materials and in the experimental simulations as well as to reassess and extend existing geochemical models. To achieve these goals, I propose a multidisciplinary approach which combines (1) the geochemical and petrological investigations of natural samples from arc systems, (2) the experimental determination of chalcophile element behavior at conditions simulating subduction zone environment as well as (3) the forward modelling of subduction zone processes. The outcome from these tasks will open a novel detailed view on the geochemistry of chalcophile elements in subduction zones covering a long-standing gap in our knowledge and will provide precise geochemical proxies needed for tracing contribution from different sources, interpreting subarc processes and estimating element budget and cycling.