The role of melting of oceanic crust within the subduction factory: A melt inclusion approach

俯冲工厂内洋壳熔化的作用：熔体包裹体方法

• 批准号: DP0342543
• 负责人: Prof Leonid Danyushevsky
• 金额: $ 7.66万
• 依托单位: University of Tasmania
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2003
• 资助国家: 澳大利亚
• 起止时间: 2003-01-20 至 2006-12-31
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP0342543
• 关键词: role; melting; oceanic; crust; within

Continental crust is ultimately generated in subduction zones, where oceanic crust is recycled back into the mantle along deep ocean trenches, producing island arcs. Processes occurring in the subduction 'factory' are poorly understood, but dehydration of old subducted oceanic crust is usually invoked to provide water that triggers mantle melting and arc magmatism. Evidence is accumulating that in many locations the subducted oceanic crust may melt, rather than simply dehydrate. I will test this using studies of melt inclusions (droplets of melt trapped by crystals growing in the magma), and will better constrain the input-output budgets of the subduction factory.

大陆地壳最终是在俯冲带中生成的，在俯冲带中，大洋地壳沿着沿着深海沟再循环回到地幔中，形成岛弧。过程中发生的俯冲“工厂”知之甚少，但老俯冲洋壳的脱水通常被调用，以提供触发地幔熔融和弧岩浆作用的水。越来越多的证据表明，在许多地方，俯冲洋壳可能会融化，而不仅仅是融化。我将使用熔体包裹体（被岩浆中生长的晶体捕获的熔体液滴）的研究来测试这一点，并将更好地限制俯冲工厂的投入产出预算。