Collaborative Research: Investigating out-of sequence magmatism and mantle plume-lithosphere interactions adjacent to the Snake River plain (U.S.A.)

合作研究：调查蛇河平原附近的无序岩浆作用和地幔柱-岩石圈相互作用（美国）

• 批准号: 2002786
• 负责人: Jeff Benowitz
• 金额: $ 21.38万
• 依托单位: University of Alaska Fairbanks Campus
• 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: 2020-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2002786&HistoricalAwards=false
• 关键词: Collaborative; Research; Investigating; out; sequence

Volcanic eruptions are significant hazards and drivers of societal and environmental change. Continental hotspot eruptions are the soures of the largest documented eruptions on Earth. Hotspot magmatism is recognized in part on identification of a linear chain of volcanoes that becomes younger opposite the direction of plate motion. These age-progressions may be unclear when volcanism along a hotspot “track” does not temporally fit in the age progression and is therefore, out of sequence and at times, off-axis. The Snake River Plain-Yellowstone (SRPY) volcanic province (Wyoming-Montana-Idaho, including Yellowstone National Park) is the classic example of continental hotspot magmatism, and major SRPY “supervolcano” eruptions are well documented. Small-volume volcanoes exist adjacent to the SRPY, however. This project will investigate these out of sequence volcanoes to provide an analog to better identify hotspots in the geological record, yield new constraints on how the Yellowstone hotspot interacts with North America, and be used to help refine models for the origin and eruptive history of volcanism associated with this hotspot. The findings have implications for continental hotspot volcanic hazard assessments. Student training and public outreach are also key aspects of this project. A multidisciplinary approach will be employed to unravel the spatial-temporal magmatic history adjacent to the youngest part of the SRPY hotspot track, including field mapping focused on the relations between structures and igneous activity, geochronology, and geochemistry. These data will allow the research team to: [1] determine the temporal-spatial history of out-of-sequence volcanism adjacent to the SRPY; [2] define the mantle and crustal contributions to this out of sequence and off-axis volcanism; [3] decipher the links between syn-magmatic extension, SRPY magmatism and the out of sequence and off-axis volcanism. The proposed study will provide opportunities for undergraduate and graduate students to learn a diverse suite of field, presentation, and laboratory skills. Curriculum for GeoFORCE, a Native Alaskan STEM education program, will be created and taught. GeoFORCE participants shall visit Yellowstone National Park. Scientific advances made during this project will be communicated to the public via collaboration with the Dubois Museum through public talks and field trips, the development of a geological guide of the upper Wind River basin (WY), and via news articles published globally on the web and in local newspapers.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.

火山喷发是社会和环境变化的重大危害和驱动因素。大陆热点喷发是地球上有记录的最大火山喷发的根源，部分是通过识别与板块运动方向相反的线性火山链来识别的。当沿着热点“轨迹”的火山活动在时间上不适合年龄进展时，这些年龄进展可能会不清楚，因此不按顺序，有时会偏离轴。斯内克河平原-黄石 (SRPY) 火山省（怀俄明州-蒙大拿州-爱达荷州，包括黄石国家公园）是大陆热点岩浆活动的典型例子，并且在其附近存在大型 SRPY“超级火山”喷发。然而，SRPY 项目将调查这些不按顺序排列的火山，以提供一个类比，以更好地识别地质记录中的热点，并产生新的限制。黄石热点与北美相互作用，可用于帮助完善与该热点相关的火山活动的起源和喷发历史模型。这些发现对大陆热点火山灾害评估具有重要意义。学生培训和公共宣传也是该项目的关键方面。将采用多学科方法来揭示与 SRPY 热点轨道最年轻部分相邻的时空岩浆历史，包括侧重于结构与火成岩活动之间关系的野外测绘，这些数据将使研究小组能够： [1] 确定 SRPY 附近无序火山活动的时空历史； [2] 定义地幔和地壳对这种无序火山活动的贡献；离轴火山活动；[3] 破译同岩浆延伸、SRPY 岩浆活动与无序和离轴火山活动之间的联系。拟议的研究将为本科生和学生提供机会。将为阿拉斯加原住民 STEM 教育计划 GeoFORCE 创建和教授各种现场、演示和实验室技能。 GeoFORCE 参与者将参观黄石国家公园，并交流该项目期间取得的科学进展。通过与杜波依斯博物馆合作，通过公开演讲和实地考察、开发风河流域上游 (WY) 地质指南，以及通过在全球网络和当地报纸上发表的新闻文章，向公众展示。该奖项反映了通过使用基金会的智力价值和更广泛的影响审查标准进行评估，NSF 的法定使命被认为值得支持。