【摘要】 在CSV(Cold-Seal-Vessel)高压设备中,设置温度550℃、压力0．1 GPa、放置240 h 的条件下,进行了安山质玻璃中水的扩散实验,利用傅立叶红外光谱仪测定了安山质玻璃中 OH、H2Om和H2Ot的含量,而后通过定量计算和计算机处理,获得了水在安山质玻璃中的扩散曲线。为研究水在安山质玻璃中的扩散规律以及火山喷发机理和成因提供了依据。更多还原

【Abstract】 Dissolved H2O in silicate melts and glasses plays a crucial role in volcanic eruption on terrestrial planets and affects glass properties and magma evolution. Water is also the most abundant volatile component in terrestrial basalts and the significant constituent of the gases that escape from Andesitic magma. Knowledge of the diffusivity of water in Andesitic melts is important for understanding the degassing of Andesitic magma and for assessing the fractionation of volatiles during degassing. Andesites are one of the most common magma types and may be widespread on Mars. Water is typically the most abundant dissolved volatile in these magmas. In this paper, the measurements of diffusivity of water in Andesitic glasses were carried out. The experimental condition was set at 550 ℃, 0.1 GPa (1 kb) and reaction time of 240 hours in Cold-Seal-Vessel (CSV). Fourier transform-infrared (FTIR) spectrometer was used to determine the contents of OH, H2Om and H2Ot in the Andesitic glasses. Through the quantitative calculation and computer processing of the experimental data, the diffusion curves of water in Andesitic glasses were obtained. The results of the experiments provide the basis for the studies on diffusion regularity of water in Andesitic glasses and the formation causes and mechanism of volcanic eruption.更多还原