Flood Basalt Eruption Mechanisms and Atmospheric Impact

洪水玄武岩喷发机制和大气影响

• 批准号: 9316881
• 负责人: Stephen Self
• 金额: $ 1.2万
• 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: 1994
• 资助国家: 美国
• 起止时间: 1994-04-15 至 1995-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9316881&HistoricalAwards=false
• 关键词: Flood; Basalt; Eruption; Mechanisms; Atmospheric

9316881 Self We propose that large volume basaltic lavas, such as the CRB lavas, achieved their great flow length by semi-continuous output of magma and thermally efficient emplacement, which allowed lavas to spread as far as topography would permit (in some cases 500 km). The consensus of research undertaken is that flood basalt lavas of the Columbia River province were erupted as thermally efficient, large-scale pahoehoe sheet flows; any one flow field grew progressively over a considerable time-span (months to years!). We propose continued investigation into emplacement mechanisms of flood basalt lavas with the aim of refining our current ideas on the rate at which they were erupted, and what the possible impact of a flood basalt eruption, or series of eruptions, was on the atmosphere. In particular, this grant will enable Sara Finnemore to complete her PhD work on this project.

9316881 Self我们认为，大体积的玄武质熔岩，如CRB熔岩，通过岩浆的半连续输出和热效率侵位实现了它们的大流动长度，这使得熔岩能够在地形允许的范围内传播（在某些情况下为500 km）。 所进行的研究一致认为，哥伦比亚河流域的泛滥玄武岩熔岩是作为热效率高的大规模帕霍埃霍岩席流爆发的;任何一个流场都是在相当长的时间跨度（数月至数年！）内逐渐增长的。 我们建议继续调查洪水玄武岩熔岩的侵位机制，目的是完善我们目前的想法，他们爆发的速度，以及洪水玄武岩喷发，或一系列喷发，可能对大气产生的影响。 特别是，这笔赠款将使萨拉Finnemore完成她在这个项目的博士学位工作。