CAREER: Heavy Noble Gases in the Azores Archipelago

职业：亚速尔群岛的重惰性气体

基本信息

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

项目摘要

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.

陆地大气和海洋在太阳系天体中是独一无二的。重惰性气体（氖气、氩气、氪气和氙气）追踪挥发性元素和化合物（如碳、氮和水）的起源，以及它们的预算如何随着时间的推移在地球深处和地表储层之间分配。对受地幔柱影响的地区的火山样本中的重惰性气体进行测量，对挥发性起源和运输产生了新的见解，但精确的数据来自不寻常的样本，而不是典型的地下喷发的海洋岛屿玄武岩。这项综合研究和教育工作将利用新的技术能力来测量亚速尔群岛地下喷发的海洋岛屿玄武岩中的重惰性气体；这将揭示在亚速尔群岛采样的地幔柱在地球历史上如何获得和失去挥发物，并推动该领域更好地理解地幔柱挥发物特征。将开发和传播一门现代课程，介绍用于在统一框架内研究地幔地球化学的不同同位素系统，以扩大从事地球深部地球化学高级研究的本科生群体。重惰性气体（氖、氩、氪和氙）为挥发性吸积、早期地幔分异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。然而，由于样品脱气和大气污染，大多数海岛玄武岩中的重惰性气体很难测量。新的分析技术能够测量从海洋岛屿橄榄石的大气成分中解析出的重惰性气体成分。该项目将对亚速尔群岛经过充分研究的地点进行采样，以获得大量新鲜材料，用于高精度分析氦、氖、氩、氪和氙丰度和同位素比。新数据将用于探测地幔挥发物的起源，测试地幔柱中挥发物损失的异质特征，并研究远古时期大气挥发物传输到地幔的效率。该项目将开发和测试新的地幔放射性同位素地球化学入门课程，包括惰性气体，并在统一框架内提出。通过研讨会和在线门户向教师传播课程并促进其融入课程的工作将增加和扩大从事地幔地球化学（包括稀有气体）高级研究的本科生群体。该奖项反映了 NSF 的法定使命，并被视为值得通过使用基金会的智力优点和更广泛的影响审查标准进行评估来支持。