A Numerical Investigation of the Relative Importance of Different Meltng Mechanisms at Volcanic Arcs

火山弧不同熔化机制相对重要性的数值研究

• 批准号: 0305292
• 负责人: James Conder
• 金额: $ 9.51万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0305292&HistoricalAwards=false
• 关键词: Numerical; Investigation; Relative; Importance; Different

Under this award, the PIs will use finite-element viscous flow models to study the different melting mechanisms likely to be occurring beneath volcanic arcs. The three main mechanisms to be studied are: flux melting from hydration of the mantle wedge from the subducting slab, decompression melting that occurs when a temperature-dependent mantle rheology is considered, and possible sediment melting at the subducting slab surface. Different arcs can have large differences in the amount of magmatic production and may also vary in the relative production of each melting mechanism. The PIs will investigate the various parameters affecting the production of each melting mechanism such as slab dip, subduction rate, subducting and overlying plate ages, etc. Some parameters will have a greater influence on one mechanism than another, leading to the possibility that the dominant melting mechanism could change from one arc to another, and affecting what is observed at real arcs.

根据该合同，PI将使用有限元粘性流模型来研究火山弧下可能发生的不同熔融机制。要研究的三个主要机制是：从俯冲板的地幔楔的水化通量熔融，减压熔融时发生的温度依赖的地幔流变学被认为是，和可能的沉积物熔融在俯冲板表面。不同的弧可以有很大的差异，在岩浆生产量，也可能不同的相对生产的每一个熔融机制。PI将调查影响每种熔化机制生产的各种参数，如板坯倾角、俯冲速率、俯冲和上覆板年龄等。某些参数对一种机制的影响大于另一种机制，导致主要熔化机制可能从一个电弧到另一个电弧发生变化，并影响在真实的电弧处观察到的情况。