On the stability of organic molecules in subduction zone fluids

俯冲带流体中有机分子的稳定性

• 批准号: 500785120
• 负责人: Professor Dr. Hans Keppler
• 金额: --
• 依托单位: Bayerisches Forschungsinstitut für Experimentelle Geochemie und Geophysik (BGI)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/500785120?language=en
• 关键词: stability; organic; molecules; subduction; zone

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.

根据最近的一些理论研究，有机分子，如醋酸根离子可能是稳定的，在火山弧以下的俯冲带的含水流体中。这些有机物质的存在与各种效应有关，包括金刚石的形成或流体中过量的硅酸盐溶解度。然而，完全缺乏对高压、高温水性流体中的有机物种的稳定性的实验确认。在本项目中，我们将在外部加热的金刚石对顶砧中，通过非原位活塞圆柱实验和原位拉曼光谱相结合，系统地研究高达5 GPa和800 ℃的C-H-O流体中的形态。