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.

过去 300 万年来，犹他州经历了数十次火山喷发。这些熔岩的化学成分各不相同，喷发时既具有爆炸性又具有喷发性。这些成分和喷发方式的差异通常发生在较小的地理区域内、较短的时间跨度内。这项工作旨在解决喷发的时间问题，并了解与最终产生如此多种成分的岩浆体相关的过程。该项目将为本科生提供参与研究的机会，包括样本收集、前往多个实验室以及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；这些活动将重点关注火山过程，并将与犹他州环境教育协会联合举办。在过去的十年中，Ar/Ar 测年的准确度和精度不断提高，再加上锆石岩石年代学（形态、结构、地球化学和地质年代学数据的结合），使得人们能够更好地了解喷发前岩浆室的演化，并将这些联系起来。过程到双峰火山田。最近的大多数岩石年代学研究都集中在了解大体积岩浆或大型硅质火山田内的岩浆的熔体提取和分异趋势，这两者通常都会导致超级喷发或凝固基岩。该项目将通过检查犹他州中部小型单生火山田的岩浆过程，并将其与驱动黄石公园等超级喷发的拟议岩浆动力学进行比较，扩大岩石年代学应用的范围。该奖项反映了 NSF 的法定使命，并具有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，被认为值得支持。