Chlorine in Mafic and Intermediate Melts and Associated Fluids: An Experimental Study

9526622韦伯斯特拟议的研究将提供知识的行为氯在脱气的镁铁质和中间岩浆。 拟开展的项目包括确定：（a）氯在无水熔融玄武岩和安山岩中的溶解度作为主要元素组成、压力和温度的函数，（B）氯在熔体和H2O和H2O-CO2流体之间的分配作为250 - 2000巴的压力的函数，并且在宽的氯浓度范围内，和（c）熔体和磷灰石之间的氯分配。 实验将在内部加热的压力容器，快速淬火外部加热的TXM压力容器和真空二氧化硅管悬挂在一个垂直加热炉进行。 这些数据将用于模拟镁铁质岩浆结晶过程中岩浆流体的演变，更好地推断喷发前的挥发性收支，开发火山脱气的理论模型，并更好地估计岩浆气体在上地壳和火山机构内输送金属的能力。

9526622 Webster The proposed research will provide knowledge of the behavior of chlorine in the degassing of mafic and intermediate magmas. Projects to be undertaken include determination of: (a) the solubility of chlorine in anhydrous molten basalt and andesite as a function of major element composition, pressure and temperature, (b) the partitioning of chlorine between melt and H2O and H2O-CO2 fluids as a function of pressure from 250 to 2000 bars, and over a wide range of chlorine concentrations, and (c) chlorine partitioning between melt and apatite. Experiments will be conducted in internally heated pressure vessels, rapid-quench externally heated TXM pressure vessels and evacuated silica tubes suspended in a vertical muffle furnace. The data will be used to model the evolution of hydromagmatic fluid during crystallization of mafic magmas, to better deduce pre-eruption volatile budgets, to develop theoretical models of volcanic degassing, and to better estimate the capacity of magmatic gases to transport metals within the upper crust and volcanic edifices.