Behavior of chalcophile elements in subduction zone processes

该项目的主要目标是通过建立板片脱水/熔融、地幔楔部分熔融和地壳岩浆演化之间的定量联系，提出俯冲带演化过程中亲铜元素地球化学行为的定量描述。这一目标将通过地球化学、实验岩石学和地球化学建模方面的创新方法相结合来实现。需要创新的方法来提高对俯冲带的认识，以克服目前的挑战和缺乏自然材料调查和实验模拟方面的数据，并重新评估和扩展现有的地球化学模型。为了实现这些目标，我提出了一个多学科的方法，结合（1）地球化学和岩石学研究的自然样品弧系统，（2）亲铜元素的行为在模拟俯冲带环境的条件下的实验测定，以及（3）俯冲带过程的正演模拟。这些任务的成果将为俯冲带中亲铜元素的地球化学开辟一个新的详细视角，涵盖我们知识中长期存在的空白，并将提供精确的地球化学代理，用于追踪不同来源的贡献，解释弧下过程，估计元素预算和循环。

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.