On the stability of organic molecules in subduction zone fluids

根据最近的一些理论研究，有机分子，如醋酸盐离子，可能在火山弧下方俯冲带中的水溶液中是稳定的。这些有机物种的存在与各种影响有关，包括钻石的形成或流体中硅酸盐的过量溶解。然而，对高压、高温水溶液中有机物种稳定性的实验证实是完全缺乏的。在这个项目中，我们将通过活塞柱外实验和外部加热的金刚石砧座中的原位拉曼光谱相结合的方法，系统地研究在5 GPa800˚C的C-H-O流体中的形态。

According to some recent theoretical studies, organic molecules such as the acetate ion may be stable in aqueous fluids occurring in subduction zones below volcanic arcs. The presence of these organic species has been linked to various effects, including diamond formation or excess silicate solubilities in fluids. Experimental confirmation of the stability of organic species in high-pressure, high-temperature aqueous fluids is, however, completely lacking. In this project, we will systematically study the speciation in C-H-O fluids up to 5 GPa and 800 ˚C by a combination of ex-situ piston cylinder experiments and in-situ Raman spectroscopy in externally-heated diamond anvil cells.