Sulfur Oxyanions as Indicators of Magmatic-Hydrothermal and Volcanic Processes Involving Sulfur

这个项目的目标是利用热液溶液和酸性火山口湖的硫氧离子形态作为岩浆热液和火山过程的指标。重点研究两个过程：1)硫水解和2)H2S和SO2气体排放对酸性火山口湖s形态的影响。硫水解在(1)热液系统中可能很重要，作为硫酸盐的来源，天然硫存在于地下（例如，作为埋藏的solfataras）；(2)在火山口湖中，静息期硫氧阴离子的形成可能受胶体硫或熔硫池的控制。当活动增加时，火山口湖充当了含硫岩浆气体的洗涤器。这些气体的涌入极大地改变了火山口湖中硫氧阴离子的形态（多硫酸盐，SnO62-，从溶液中消失），但细节尚不清楚。研究策略是基于实地工作和实验工作相结合。实地工作的目标是根据这些阴离子可以保留在树脂上的概念，制定硫氧离子的采样和保存方案。使用这种树脂柱来保存物种形成的协议将允许对世界各地的火山口湖和热液系统进行研究。将进行模拟硫磺水解和火山口湖硫磺气体冷凝的实验。

9706142 Schoonen The goal of this project is to use the sulfur oxyanion speciation of hydrothermal solutions and acid crater lakes as indicators of magmatic-hydrothermal and volcanic processes. The effort will focus on two processes: 1) sulfur hydrolysis and 2) the changes in S-speciation in acid crater lakes due to the discharge of H2S and SO2 gas. Sulfur hydrolysis may be important in (1) hydrothermal systems as a source of sulfate where native sulfur occurs in the subsurface (e.g., as buried solfataras); and (2) in crater lakes where the sulfur oxyanion speciation during quiescent times is likely to be controlled by colloidal sulfur or pools of molten sulfur. Upon increased activity, crater lakes act as a scrubber of magmatic S-bearing gases. The influx of these gases changes the sulfur oxyanion speciation in crater lakes drastically (polythionates, SnO62- , are lost from solution), but details are not understood. The research strategy is based on a combination of field work and experimental work. The goal of the field work is to develop a sampling and preservation protocol for sulfur oxyanions based on the notion that these anions can be retained on a resin. A protocol in which columns with this resin are used to preserve the speciation would allow for the study of crater lakes and hydrothermal systems around the world. Experiments will be conducted to simulate sulfur hydrolysis and condensation of sulfur gases in crater lakes.