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有关氯在镁铁质岩浆和中间岩浆脱气过程中的行为的知识。将开展的项目包括：(A)确定氯在无水熔融玄武岩和安山岩中的溶解度，这是主要元素组成、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，是压力从250巴到2000巴的函数，以及在广泛的氯浓度范围内的分配；以及(C)氯在熔体和磷灰石之间的分配。实验将在内部加热的压力容器、快速淬火的外部加热的TXM压力容器和悬浮在垂直马弗炉中的真空二氧化硅管中进行。这些数据将被用来模拟镁铁质岩浆结晶过程中水岩浆流体的演化，更好地推断喷发前的波动平衡，发展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建筑物内输送金属的能力。

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.