Plumbing the gap: a mantle solution to the enigma of bimodal arc volcanism

俯冲带和火山弧是地球上构造最活跃的地区，对理解、地球化学循环、构造-气候耦合、矿石成因和自然灾害至关重要。双峰式火山作用是长期以来被认识到的弧形地壳的特征，从未得到令人满意的解释，然而，它控制着其中的许多过程。该项目将检验一种新的假设，即这两种类型的岩浆来自不同的地幔来源。它将新颖的高压实验与天然火山岩的数据库分析相结合，涵盖了从地幔来源到火山的岩浆系统。这个项目将提高我们对电弧过程的理解，包括经济金属与双峰弧火山作用的联系。

Subduction zones and volcanic arcs are the most tectonically active regions on Earth and are crucial to understanding, geochemical cycles, tectonic-climate coupling, ore genesis and natural hazards. Bimodal volcanism is a long-recognised characteristic of arc crust that has never been satisfactorily explained, yet, it controls many of these processes. This project will test a new hypothesis that the two types of magmas originate from distinct mantle sources. It integrates novel high-pressure experiments with database analysis of natural volcanic rocks, covering magmatic systems from mantle source to volcano. This project will improve our understanding of arc processes, including the association of economic metals with bimodal arc volcanism.