Collaborative Research: The Movement of Gas & Crystals Beneath Kilauea

合作研究：气体的运动

• 批准号: 8915391
• 负责人: Alfred Anderson
• 金额: $ 8.9万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-01 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8915391&HistoricalAwards=false
• 关键词: Collaborative; Research; Movement; Gas; &amp

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.

这是芝加哥大学的阿尔弗雷德·安德森和俄亥俄州的多克·萨哈吉安合作的项目。该项目的主要目标是确定基拉韦厄山顶下是否有天然气聚集。这个想法是，在构造顶端聚集的天然气可以导致顶峰喷口的持续局部化。其他目标是：1)利用熔融包裹体确定基拉韦厄火山下橄榄石结晶的深度：2)确定基拉韦厄火山母岩浆中二氧化碳和H20的初始体积浓度。将研究基拉韦河水下玄武岩和海底玄武岩。用电子探针分析橄榄石斑晶中玻璃包裹体的常量元素和S，用红外光谱分析H_20和CO_2。此外，还将测量海底玻璃玄武岩中气泡的大小、丰度和气体压力。将测量玻璃包裹体中气泡的大小和气体压力，以便与主体玻璃中的气泡进行比较。将进行计算，以评估基拉韦厄火山下面不断演化的岩浆体中气泡的结合和上升速度。结果将与现有的关于排出气体、岩浆流入和喷发的历史速率的数据进行比较。这些数据和计算将用于测试和改进基拉韦厄火山放气和演化的现有模型。总体而言，PI将检验基拉韦厄火山是一座集中式火山的观点，因为上升的气体会在其顶端寻找并维持一个喷口。