High-Pressure Melting of Subducted Oceanic Crust: Characterizing the Major- and Trace-Element Signatures of Slab Melts Using a Modified Diamond-Aggregate Technique

9706254 Stolper 该项目的目标是 (1) 开发一个 25 和 30 kbar 下的实验数据库，表征岛弧下俯冲水合洋中脊玄武岩 (MORB) 近固相线熔融产生的蒸气不饱和液体的主要元素组成； （2）确定与榴辉岩残渣平衡的含水近固相线是否在低熔体分数下相互关联，这对于了解这些液体是否可以从板片中提取到上覆地幔楔中非常重要； (3) 确定高场强 (HFS) 和稀土元素 (REE) 在单斜辉石、石榴石和近固相线熔体之间的分配。 这里提出的实验将扩大模拟近固相线板片熔体的地球化学特征的能力，并且该特征将改变地幔并在会聚边缘喷发的熔岩中表达。

9706254 Stolper The goals of this project are (1) to develop an experimental data base at 25 and 30 kbar characterizing the major element compositions of vapor-undersaturated liquids produced by near-solidus melting of subducted, hydrated mid-ocean ridge basalt (MORB) beneath island arcs; (2) to determine whether hydrous near-solidus in equilibrium with an eclogite residue are interconnected at low melt fractions, which is important for understanding whether these liquids can be extracted from the slab into the overlying mantle wedge; and (3) to determine the partitioning of high field strength (HFS) and rare earth elements (REE) between clinopyroxene, garnet, and near-solidus melts. The experiments proposed here will expand the ability to model the geochemical signature of near-solidus slab melts and hoe this signature would alter the mantle and be expressed in erupted lavas from convergent margins.