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

根据这一奖项，PI将使用有限元粘性流动模型来研究火山弧下可能发生的不同融化机制。需要研究的三个主要机制是：来自俯冲板块的地幔楔体水化产生的熔剂熔融，考虑依赖温度的地幔流变性时发生的减压熔融，以及俯冲板块表面可能发生的沉积物熔融。不同的弧在岩浆产生量上可能有很大的差异，也可能在每种熔融机制的相对产生量上有所不同。PI将调查影响每种熔融机制产生的各种参数，如板坯倾角、俯冲速度、俯冲和上覆板块年龄等。一些参数对一种机制的影响将比对另一种机制的影响更大，导致主导的熔化机制可能从一个弧变到另一个，并影响在真实弧处观察到的情况。

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.