The Flux of Volatiles from Active MARGINS: the Central American Volcanic Arc

活跃边缘的挥发物通量：中美洲火山弧

• 批准号: 0079402
• 负责人: Tobias Fischer
• 金额: $ 5.11万
• 依托单位: University of New Mexico
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-15 至 2002-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0079402&HistoricalAwards=false
• 关键词: Flux; Volatiles; Active; MARGINS; Central

0079402FischerIn a subduction zone, the material transfer from sediments of the subducting plate into arc magmas has been identified by chemical tracers, such as Berillium and Boron. In recent years, significant progress has been made towards understanding the element cycles in subduction zones and the time-scales these cycles operate on with the goal of arriving at element budgets of active margins. The vast amount of detailed geochemical information available for arc magmas stands in contrast to the very limited detailed information available for volatile discharges from active margin volcanoes. Volatiltes play a pivotal role in element transfers occurring at subduction zones. Despite their importance, comparatively little is known about the ultimate sources of the volatiles in subduction zones. Even less is known about the volatile budgets of any active subduction zone.The goal of this project is to perform a detailed, systematic study of the sources of volatile discharges and the fluxes of these volatiles to the atmosphere at 3-4 active volcanoes along the Central American Volcanic Arc. The P.I. will attempt to determine the sources of carbon dioxide, water, nitrogen and noble gases and their fluxes to the atmosphere. The Central American Volcanic Arc is one of the best places in the world for such a study because a vast amount of geochemical information on the magmas is available, the amount of fluid contributions is documented to vary along strike of the arc, and crustal contamination is relatively minor and quite well constrained. The study is a "pilot study" targeting these 3-4 volcanoes in order to test whether there is a correlation regarding the sources of volatiles with the sources of the magmas as identified geochemically.***

[00:79402 . 02]在俯冲带中，物质从俯冲板块的沉积物转移到弧岩浆中，已被化学示踪剂（如铍和硼）所识别。近年来，在了解俯冲带的元素旋回和这些旋回运作的时间尺度方面取得了重大进展，目标是达到活动边缘的元素预算。弧岩浆的大量详细地球化学信息与边缘活火山挥发性排放物的非常有限的详细信息形成鲜明对比。在俯冲带发生的元素转移中，挥发物起着关键作用。尽管它们很重要，但对俯冲带挥发物的最终来源却知之甚少。对于任何活动俯冲带的不稳定预算，人们所知的就更少了。该项目的目标是对中美洲火山弧沿线3-4座活火山的挥发性排放物来源和这些挥发性排放物向大气的通量进行详细、系统的研究。私家调查团将试图确定二氧化碳、水、氮和惰性气体的来源及其在大气中的通量。中美洲火山弧是世界上进行此类研究的最佳地点之一，因为可以获得大量关于岩浆的地球化学信息，记录的流体贡献量沿弧走向而变化，地壳污染相对较小，而且受到了很好的控制。这项研究是一项针对这3-4座火山的“试点研究”，目的是测试挥发物的来源与地球化学鉴定的岩浆来源是否存在相关性