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Collaborative Research-RUI: Beyond the big ones: Petrochronologic investigation of Quaternary small-volume volcanism in the Black Rock Desert, Utah

RUI 合作研究：超越大火山：犹他州黑岩沙漠第四纪小体积火山活动的岩石年代学研究

基本信息

批准号：
1940305
负责人：
Nicholas Pollock
金额：
$ 30.8万
依托单位：
Westminster College of Salt Lake City
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2020
资助国家：
美国
起止时间：
2020-04-01 至 2025-03-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1940305&HistoricalAwards=false
关键词：
Collaborative Research RUI Beyond big

项目摘要

Utah has experienced dozens of volcanic eruptions over the last 3 million years. The chemical compositions of these lavas has varied, and eruptions have been both explosive and effusive. These differences in composition and eruptive style often have occurred within the small geographic area over narrow timespans. This work seeks to resolve the timing of eruptions and understand the processes associated with the magma bodies that ultimately produced such a wide variety of compositions. The project will provide opportunities for undergraduate students to participate in research, including sample collection, traveling to multiple laboratories, and presenting their work at international meetings. It will also provide training to K-12 educators in Utah; these will focus on volcanic processes and will be held in conjunction with the Utah Society for Environmental Education. Over the last decade, improved accuracy and precision of Ar/Ar dating coupled with zircon petrochronology (the combination of morphological, textural, geochemical, and geochronologic data) has allowed for improved understanding of the evolution of magma chambers prior to eruption, and connecting these processes to bimodal volcanic fields. Most of the recent petrochronology studies have focused on understanding melt extraction and differentiation trends in large-volume magmas or magmas within large silicic volcanic fields, both of which often result in super-eruptions or solidified batholiths. This project will expand the scope of petrochronologic applications by examining magmatic processes in small, monogenetic volcanic fields in central Utah, and by comparing those to the proposed magma dynamics that drive super-eruptions like those at Yellowstone.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.

犹他州在过去的300万年里经历了数十次火山爆发。这些熔岩的化学成分各不相同，喷发既有爆炸性的，也有喷涌性的。这些成分和喷发方式的差异往往发生在狭窄的时间跨度内的小地理区域内。这项工作旨在解决喷发的时间，并了解与岩浆体相关的过程，这些岩浆体最终产生了各种各样的成分。该项目将为本科生提供参与研究的机会，包括样本收集，前往多个实验室，并在国际会议上展示他们的工作。它还将为犹他州的K-12教育工作者提供培训；这些活动将侧重于火山过程，并将与犹他州环境教育协会联合举行。在过去的十年中，Ar/Ar定年的准确性和精度的提高与锆石岩石年代学（结合形态、质地、地球化学和地质年代学数据）相结合，使人们能够更好地了解喷发前岩浆室的演化，并将这些过程与双峰火山场联系起来。最近的岩石年代学研究大多集中在了解大体积岩浆或大型硅质火山域中岩浆的熔体提取和分异趋势，这两种岩浆都经常导致超级喷发或岩基固化。这个项目将扩大岩石年代学的应用范围，通过检查犹他州中部小型单成因火山场的岩浆过程，并将其与黄石公园等超级火山爆发的岩浆动力学进行比较。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。