CAREER: Heavy Noble Gases in the Azores Archipelago

职业：亚速尔群岛的重惰性气体

• 批准号: 2145663
• 负责人: Rita Parai
• 金额: $ 72.09万
• 依托单位: Washington University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-06-01 至 2027-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2145663&HistoricalAwards=false
• 关键词: CAREER; Heavy; Noble; Gases; Azores

The terrestrial atmosphere and ocean are unique among Solar System bodies. The heavy noble gases (neon, argon, krypton and xenon) trace where volatiles elements and compounds like carbon, nitrogen and water originated and how their budgets have been distributed between the deep Earth and surface reservoirs over time. Measurements of heavy noble gases in volcanic samples from localities influenced by mantle plumes have yielded new insights into volatile origins and transport, but precise data have come from unusual samples, rather than typical subaerially-erupted ocean island basalts. This integrated research and educational work will harness new technical capabilities to measure heavy noble gases in subaerially-erupted ocean island basalts from the Azores archipelago; this will shed light on how the mantle plume sampled at the Azores acquired and lost volatiles over Earth history and advance the field towards a better understanding of mantle plume volatile signatures. A modern curriculum that presents different isotope systems used to study the geochemistry of the mantle within a uniform framework will be developed and disseminated to broaden the pool of undergraduates who pursue advanced study of the geochemistry of the deep Earth. The heavy noble gases (neon, argon, krypton and xenon) provide unique and powerful insights into volatile accretion, early mantle differentiation, and volatile transport between the interior and surface reservoirs. However, heavy noble gases are difficult to measure in most ocean island basalts due to sample degassing and atmospheric contamination. New analytical techniques have enabled the measurement of heavy noble gas compositions resolved from the atmospheric composition in olivines from ocean islands. This project will sample well-studied sites in the Azores archipelago to obtain large quantities of fresh material for high-precision analysis of helium, neon, argon, krypton and xenon abundances and isotopic ratios. New data will be used to probe mantle volatile origins, test for heterogeneous signatures of volatile loss among mantle plumes, and investigate the efficiency of atmospheric volatile transport into the mantle in the deep past. This project will develop and test a new introductory curriculum for mantle radiogenic isotope geochemistry including noble gases, presented within a unifying framework. Work to disseminate the curriculum to teachers through a workshop and online portals and facilitate its integration into courses will increase and broaden the pool of undergraduates who pursue advanced study of mantle geochemistry, including the noble gases.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

陆地气氛和海洋在太阳系体之间是独一无二的。重型贵重气体（霓虹灯，氩气，k子和氙气）迹象，其中挥发性元素和化合物（如碳，氮和水）产生了，以及如何随着时间的推移将预算分布在深地球和表面储层之间。来自地幔羽流的地方的火山样品中重型贵重气体的测量已产生了对挥发性起源和运输的新见解，但精确的数据来自异常的样本，而不是典型的下次下腐烂的海洋岛玄武岩。这项综合的研究和教育工作将利用新的技术能力来测量亚速尔群岛群岛的海洋岛玄武岩下爆发的重量贵重气体；这将阐明如何在地球历史上获得的地幔羽流在亚速尔群岛采样并丢失的挥发物，并促进对地幔羽挥发性签名的更好理解。将开发和传播一种用于研究统一框架内地幔地球化学的不同同位素系统的现代课程，以扩大对深层地球地球化学进行高级研究的本科生。沉重的贵重气体（霓虹灯，氩气，k k和氙气）为挥发性增生，早期地幔分化以及内部和表面储层之间的挥发性传输提供了独特而有力的见解。但是，由于样品脱气和大气污染，大多数海洋岛玄武岩中的大量贵重气体很难测量。新的分析技术使得从海洋岛上的橄榄石中大气成分解决了重型贵重气体成分。该项目将在Azores群岛中采样良好的地点，以获取大量新鲜材料，以高精度分析氦，霓虹灯，氩，k，k，以及Xenon的丰度和同位素比率。新数据将用于探测地幔挥发性的起源，测试地幔羽流中挥发性损失的异质特征，并研究大气中挥发性的效率在过去的深处进入地幔。该项目将开发和测试用于地幔放射同位素地球化学的新入门课程，其中包括在统一框架内提出的贵重气体。通过研讨会和在线门户将课程传播给教师的工作，并促进其整合到课程中，将增加和扩大对地幔地震质量进行高级研究的高级研究的库，包括贵族，这一奖项反映了NSF的法定任务，并通过评估基金会的范围来反映出支持者的支持者，并已被认为是基金会的范围。