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的实验，确定HFSE流动性的因素，在岛弧下的地幔，特别是在交代的岛弧玄武岩源区的板状流体。 HFSE在热液体系中的流动性取决于HFSE主体矿物的稳定性及其在水相流体中的溶解度。 水热相平衡实验在1.5-2.5 GPa和800- 1100 oC在已知的氧逸度将允许鉴定稳定的HFSE主机在橄榄岩（地幔楔）和玄武岩（俯冲板）的组成掺杂钛和锆。 HFSE宿主矿物的单晶水溶性实验作为P，T和流体组成的函数，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.