Experimental Investigation of the Stability and Aqueous Solubility of Ti and Zr-rich Minerals: Implications for HFSE Mobilities in Subduction Zones

9317105艾尔斯这项研究将涉及一些实验，以确定决定岛弧下地幔中高频SE活动性的因素，特别是在板岩衍生流体交代岛弧玄武岩源区的过程中。HFSE在水热体系中的迁移率取决于HFSE宿主矿物的稳定性及其在水相流体中的溶解度。在已知氧逸度、1.5-2.5 Gpa和800-1100oC的水热相平衡实验中，可以确定掺钛和锆的橄榄岩(地幔楔体)和玄武岩(俯冲板)中稳定的HFSE宿主。作为P、T和流体组成函数的HFSE宿主矿物的单晶水溶解度实验将确定促进HFSE流动性的条件。

9317105 Ayers This research will involve experiments that identify the factors which determine HFSE mobility in the mantle beneath island arcs, specifically during metasomatism of the source region of island arc basalts by slab-derived fluids. The mobility of HFSE in hydrothermal systems depends on the stability of HFSE host minerals and their solubility in the aqueous fluid phase. Hydrothermal phase equilibria experiments at 1.5-2.5 GPa and 800-1100oC at known oxygen fugacities will allow identification of stable HFSE hosts in a peridotite (mantle wedge) and a basalt (subducted slab) composition doped with Ti and Zr. Single-crystal aqueous solubility experiments of HFSE host minerals made as a function of P, T, and fluid composition will identify conditions that promote HFSE mobility.