Structure of the Hawaiian Mantle Plume: Geochemical-Isotopic Mapping Using Post-Shield Lavas

夏威夷熔岩的地球化学提供了关于地幔深部性质的线索。 该项目将利用对夏威夷和毛伊岛的盾后和盾后熔岩的地球化学测量，以及沿着选定的近海样品和基拉韦厄火山盾的岩芯样品，完成夏威夷地幔柱岩浆生成区的地球化学同位素“地图”。 这些数据将与羽流中的流动、温度结构和熔化的流体动力学模型相结合，以评价下地幔羽流源的性质和岩石圈下羽流的性质。 主要的地球化学特征是Sr、Nd、Hf、Os、Pb、O和He的同位素比值。 智力优点：拟议中的研究将有助于我们了解行星过程和火山学的基本方面，并将结合联合收割机地球化学，岩石学和流体动力学。 首次对U-Th-He法在火山岩中的应用进行了评价。该项目负责人在同位素地球化学研究方面有28年的经验，有广泛的出版记录，培养了20多名博士。学生谁去了学术界，政府和私营企业的成功职业生涯，并与夏威夷同位素地球化学和动力学的研究经验。更广泛的影响：研究结果将对地球物理学、行星科学以及火山的起源和行为产生广泛的影响。 该项目的多学科方面为高级地球科学教育和技术培训提供了丰富的场所。 这笔资金将帮助支持一个研究设施，在过去的15年里，该设施使22名研究生（9名女性）、8名博士后研究员（4名女性）以及20多名访问者、本科生和合作者受益。

The geochemistry of Hawaiian lavas provides clues about the nature of the deep mantle. This project will use geochemical measurements on post-shield, and late-shield lavas of the islands of Hawaii and Maui, along with both selected offshore samples and samples of core from the shield of Kilauea volcano, to complete a geochemical-isotopic "map" of the magma-producing region of the Hawaiian mantle plume. The data will be integrated with fluid dynamical models of the flow, temperature structure and melting in the plume to evaluate the properties of the lower mantle plume source, and the nature of plume flow beneath the lithosphere. The primary geochemical characterization will be for the isotope ratios of Sr, Nd, Hf, Os, Pb, O, and He. Intellectual merit: The proposed research will contribute to our understanding of fundamental aspects of planetary processes and volcanology, and will combine geochemistry, petrology, and fluid dynamics. The U-Th-He method will be evaluated for application to volcanic rocks for the first time. The PI has 28 years of experience in isotope geochemical research, has an extensive publication record, trained more than twenty Ph.D. students who have gone on to successful careers in academia, government, and private industry, and has experience with research on Hawaiian isotope geochemistry and dynamics. Broader Impacts: The results will have broad impacts for geophysics, planetary science, and the origin and behavior of volcanoes. The multidisciplinary aspects of the project provide a rich venue for advanced earth science education and technical training. The funding will help support a research facility that, in the previous 15 years has benefited 22 graduate students (9 women) 8 postdoctoral fellows (4 women), plus more than 20 visitors, undergraduates and collaborators.