Phase Separation in the Aftermath of Subseafloor Magmatic Events: An Experimental Study of Processes of Acid-Generation, Aqueous Speciation, and Vapor-Phase Transport of Fe

摘要-0751771（Seyfried）智力优点：本研究提供了一系列综合实验，可以评估在380 - 500 C和250 - 350 bar条件下，含NaCl系统中的液-气分配、酸生成过程以及氧化还原变化对Fe蒸汽传输的作用。这些对于热地热沃茨与岩石相互作用的反应很重要，导致矿物溶解和沉淀，以及产生深层热卤水。 实验将建立从一个简单的NaCl-H2O-HCl系统，包括钙和铁的水解作用，产生酸度可以检查。 蒸汽运输的铁将在一系列磁铁矿轴承实验中确定溶解H2在固定值从2至100毫米/公斤和浓度大于或等于在热液系统中观察到的。 为了这项工作，将开发一种新型的新反应器，允许对蒸汽和盐水相进行采样，并配备原位化学传感器，以确定气相中HCl的活性。 水的形态，汽-液分配，和矿物溶解度对蒸汽和盐水的组成的影响将被确定。更广泛的影响：这项工作的更广泛的影响包括：生成用于从地热能发电到地球科学到化学工程到高温水岩系统中的反应性运输建模等广泛学科的基本数据和参数。 具有原位化学传感器的钛反应器的开发是一项重要的技术发展，并增加了科学的基础设施。 这项工作还支持研究生和本科生的培训，以及来自性别或种族在科学领域代表性不足的群体的学生参与的可能性。

ABSTRACT-0751771 (Seyfried)Intellectual Merit: This research provides an integrated series of experiments that allow the assessment of liquid-vapor partitioning, acid generating processes, and the role of redox variation on vapor-transport of Fe in NaCl-bearing systems from 380 to 500 C and 250 to 350 bars. These are important for reactions in which hot geothermal waters interact with rocks, causing mineral dissolution and precipitation as well as the generation of deep hot brines. Experiments will build from a simple NaCl-H2O-HCl system to those that include Ca and Fe where hydrolysis effects that generate acidity can be examined. Vapor transport of Fe will be determined during a series of magnetite-bearing experiments with dissolved H2 at fixed values from 2 to 100 mm/kg and concentrations greater or equal to those observed in hydrothermal systems. For the work, a novel new reactor will be developed that permits sampling of vapor and brine phases and that is fitted with in-situ chemical sensors that allow the activity of HCl in the vapor phase to be determined. Aqueous speciation, vapor-liquid partitioning, and mineral solubility effects on the composition of vapors and brines will be determined. Broader Impacts: Broader impacts of the work include: the generation of essential data and parameters for use in a wide range of disciplines ranging from geothermal energy generation to earth science to chemical engineering to reactive transport modeling in high temperature water-rock systems. The development of the titanium reactor with in-situ chemical sensors is an important technological development and increases the infrastructure for science. The work also supports graduate and undergraduate training and the likelihood that students from groups whose gender or race is under-represented in the sciences will be engaged.