Abstract

Liquid immiscibility was studied in melting experiments in the system trachyrhyolite–water ± salt (NaF, Na₂CO₃) conducted at parameters imitating those of the volcanic process. The indicator components were La, Nb, Sr, W, Mo, Cr, Fe, Rb, and Cs. The experimental runs were carried out in a high gas pressure apparatus. At 1200ºC and 5 kbar, melting, homogenization, and melt saturation with fluid components occurred. A decrease in the P–T parameters to 1000°C and 1 kbar led to the onset of liquid immiscibility in the form of droplets in the melt matrix. The composition of the droplets is similar to that of the melt matrix and differs from the latter only in concentrations of water, indicator components, and proportions of alkaline and alkali-earth elements. In the presence of salt (NaF), the melt exsolved into immiscible silicate and salt melts. No liquid immiscibility was detected when Na carbonate was added to the melt, but its agpaitic coefficient increased.

中文翻译：

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流体-磁性系统中的液体不溶混性：实验研究

摘要

液体不混溶性是在砂绿铁水-水±盐（NaF，Na ₂ CO ₃）系统的熔融实验中以模拟火山过程的参数进行研究的。指示剂成分为La，Nb，Sr，W，Mo，Cr，Fe，Rb和Cs。实验运行在高压装置中进行。在1200ºC和5 kbar时，发生熔融，均质化和熔体饱和，并伴有流体成分。P – T的减少设定为1000°C和1 kbar的参数导致以熔体基质中的液滴形式出现液体不溶混性。液滴的组成与熔融基质的组成相似，仅在水的浓度，指示剂成分以及碱和碱土元素的比例方面与后者不同。在盐（NaF）的存在下，熔体溶解为不溶混的硅酸盐，盐熔体。当将碳酸钠添加到熔体中时，未检测到液体不溶混性，但是其胶凝系数增加。