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

探索缝隙：双峰弧火山活动之谜的地幔解决方案

• 批准号: DP200100482
• 负责人: A/Prof Nathan Daczko
• 金额: $ 15.63万
• 依托单位: Macquarie University
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2020
• 资助国家: 澳大利亚
• 起止时间: 2020-05-18 至 2023-12-31
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP200100482
• 关键词: Plumbing; gap; mantle; solution; enigma

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.

俯冲带和火山弧是地球上构造活动最活跃的区域，对认识地球化学旋回、构造-气候耦合、成矿和自然灾害至关重要。双峰火山作用是长期以来公认的弧壳特征，但从未得到令人满意的解释，然而，它控制着许多这些过程。这个项目将测试一个新的假设，即这两种类型的岩浆起源于不同的地幔来源。它将新型高压实验与天然火山岩数据库分析相结合，涵盖了从地幔源到火山的岩浆系统。这个项目将提高我们对弧过程的理解，包括经济金属与双峰弧火山作用的联系。