Formation, Stability and Reactivity of Metastable Sulfur Oxyanions in Hydrothermal Solutions

9407099 Schoonen研究的目的是通过实验研究和实地工作来评估硫氧阴离子在热液系统中可能发挥的作用。 由于对这些含硫物质的稳定性知之甚少，PI在该计划的第一阶段进行了实验，以研究硫代硫酸盐的稳定性。 对于本资助周期，PI建议将实验工作重点放在硫代硫酸盐的形成上。 硫代硫酸盐形成的两种途径：1）在矿物表面和金属离子存在下的H2S-SO 4平衡，以及2）含Fe（III）矿物作为氧化剂的H2S氧化将在高达250 oC的温度下进行研究。 第三个主要途径，H2S氧化O2，是我们的实地工作的重点。 黄石公园将被用作天然实验室，以补充斯托尼布鲁克的实验研究。 这一实地工作将使我们做好准备，迎接对深层热液流体进行采样的挑战，这是一个长期目标。

9407099 Schoonen The objective of the research is to evaluate through experimental studies and field work the role sulfur oxyanions may play in hydrothermal systems. Because little is known about the stability of these sulfur species, the PI has conducted experiments in the first stage of this program to study the stability of thiosulfate. For this funding cycle, the PI proposes to focus the experimental work on the formation of thiosulfate. Two pathways for thiosulfate formation: 1) H2S-SO4 equilibration in the presence of mineral surfaces and metal ions, and 2) H2S oxidation with FE(III) bearing minerals as oxidants will be studied to temperatures up to 250oC. A third major pathway, H2S oxidation by O2, is the focus of our field work. Yellowstone will be used as a natural lab to complement the experimental studies at Stony Brook. This field work will prepare us for the challenges of sampling deep hydrothermal fluids which is a long-term objective.