Flood Basalts: Eruption Mechanisms and Atmospheric Impact

溢流玄武岩：喷发机制和大气影响

• 批准号: 9118755
• 负责人: Stephen Self
• 金额: $ 10万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-02-15 至 1994-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118755&HistoricalAwards=false
• 关键词: Flood; Basalts; Eruption; Mechanisms; Atmospheric

The objective in this study is to investigate the modes of emplacement of lava flows in the giant Tertiary-age flood basalt province of the Columbia River plateau. Also planned is research that should enable an estimate to be made of the amount of degassing that occurred during the extrusion of one or two selected large lava flows. In addition to gaining new insights into flood basalt volcanism, knowledge of discharge rates, eruptive styles, and volatile budgets of the magmas will be crucial to assessing the environmental impacts of this end-member style of volcanic activity. The PIs are testing methods of diagnosing flow surface morphologies, vesicle distribution patterns, and internal flow structures of the lavas. They also will be making parallel studies on the characteristics of vent structures and feeder dikes to gain additional information on discharge rates.

本研究的目的是研究哥伦比亚河高原第三纪洪水玄武岩省熔岩流的侵位模式。还计划进行研究，以便能够估计在挤出一两个选定的大型熔岩流期间发生的脱气量。除了获得对洪水玄武岩火山作用的新见解外，对岩浆的放电速率、喷发风格和不稳定预算的了解对于评估这种末端型火山活动的环境影响至关重要。pi是诊断熔岩流动表面形态、囊泡分布模式和内部流动结构的测试方法。他们还将对喷口结构和给料坝的特征进行平行研究，以获得有关排放率的额外信息。