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

9706142 Schoonen本项目的目标是利用热液中的硫氧阴离子物种形成 解决方案 和 酸 火山口 湖泊 作为岩浆热液和火山作用的指示。 本研究将着重于两个过程：1）硫的水解和2）由于H2S和SO2气体的排放而引起的酸性火山口湖中S-形态的变化。 硫水解在（1）作为硫酸盐来源的水热系统中可能是重要的，其中天然硫存在于地下（例如，作为埋solfataras）;和（2）在火山口湖泊中，硫氧阴离子的物种形成在静止时间可能是由胶体硫或熔融硫池控制。 当火山活动增加时，火山口湖就像是岩浆含硫气体的洗涤器。 这些气体的涌入改变了火山口湖泊中硫氧阴离子的形态（连多硫酸盐，SnO 62-，从溶液中丢失），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。 现场工作的目标是制定一个采样和保存协议的硫氧阴离子的概念，这些阴离子可以保留在树脂的基础上。 一种使用这种树脂的柱子来保存物种形成的协议将允许研究世界各地的火山口湖泊和热液系统。将进行实验来模拟火山口湖中硫的水解和含硫气体的冷凝。

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.