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

拟议的研究将提供氯在基性和中间岩浆脱气过程中的行为的知识。将要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与主要元素组成、压力和温度的关系；(b)氯在熔体与水和水-二氧化碳流体之间的分配关系与250至2000巴压力的关系以及氯浓度范围的关系；(c)氯在熔体与磷灰石之间的分配关系。实验将在内加热压力容器、快淬外加热TXM压力容器和悬浮在垂直马弗炉中的真空硅管中进行。这些数据将用于模拟岩浆岩浆结晶过程中岩浆流体的演化，更好地推断喷发前的挥发性收支，建立火山脱气的理论模型，更好地估计岩浆气体在上地壳和火山建筑物内运输金属的能力。

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.