Collaborative Research: The Movement of Gas & Crystals Beneath Kilauea

这是一个合作项目， 芝加哥大学和俄亥俄州的多克·萨哈吉安。 该项目的目标是确定气体是否积聚 在基拉韦厄的山顶下 这个想法是， 结构顶点可导致顶点持续定位 通风口 另外的目标是：1）使用熔体夹杂物， 确定了基拉韦厄下橄榄石结晶的深度： 和2）确认CO2和H2O的初始本体浓度 在基劳埃母岩浆中。 基劳埃亚潜艇 将研究玄武岩。 橄榄石中的玻璃夹杂物 斑晶中的主元素和硫将通过电子 通过微探针和红外光谱法测定H2O和CO2。 在 此外，还研究了微囊泡的大小、丰度和气压， 将测量玻璃状海底玄武岩。 大小和气体 将测量玻璃夹杂物中气泡的压力， 与宿主玻璃中的囊泡进行比较。 计算将 进行评估的聚结和上升率 在基拉韦厄火山下不断演化的岩浆中形成气泡。 的 结果将与历史上的现有数据进行比较， 放气、岩浆流入和喷发的速率。 的数据和 计算将用于测试和完善现有的模型， 基拉韦厄火山的放气和演化。 总体看 PI将测试基拉韦厄是一个集中火山的想法 因为上升的天然气会在其顶峰寻找并维持一个出口。

This is a collaborative project between Alfred Anderson of the University of Chicago and Dork Sahagian of Ohio State.The main goal of the project is to establish whether gas accumulates beneath Kilauea's summit. The idea is that gas accumulation at the structural apex can cause persistent localization of a summit vent. Additional goals are: 1) to use melt inclusions to establish the depths of olivine crystallization beneath Kilauea: and 2) to confirm the initial bulk concentration of C02 and H20 in Kilauean parent magma. Subaerial and submarine Kilauean basalts will be studied. Inclusions of glass in Olivine phenocrysts will be analyzed for major elements and S by electron microprobe and for H20 and C02 by infra-red spectroscopy. In addition the size, abundance and gas pressure of vesicles in glassy submarine basalts will be measured. The sizes and gas pressures of gas bubbles in glass inclusions will be measured for comparison with the vesicles in host glasses. Calculations will be performed to assess the coalescence and rate of rise of bubbles in the evolving body of magma beneath Kilauea. The results will be compared with existing data on the historical rates of outgassing, magma influx, and eruption. The data and computations will be used to test and refine existing models of the outgassing and evolution of Kilauea volcano. Overall, the PIs will test the idea that Kilauea is a centralized volcano because rising gas seeks and maintain a vent at its summit.