CAREER: Petrogenesis of Hawaiian lavas, Constraints from metal stable isotopes

这个职业项目将集中在了解夏威夷喷发的岩浆的来源。 夏威夷的火山活动通常被认为是地球内部深处地幔柱上升形成岩浆活动的最好例子。地幔柱假说为许多板内火山活动提供了一个优雅的解释，例如夏威夷，它在塑造地球表面及其生物圈的过程中发挥了重要作用。然而，地幔柱的许多方面，甚至它们的存在，仍然存在很大的争议。在这项研究中，研究人员着手使用几种最先进的地球化学和同位素示踪剂来了解夏威夷火山活动的演变及其对地幔柱假说的影响。在这些提议的示踪剂中，他将对一组夏威夷样本进行几种新型金属稳定同位素示踪剂的系统分析。 PI还计划一个以分析地球化学为重点的暑期教育计划，该计划补充了内华达州拉斯维加斯大学（UNLV）地球科学系现有的强有力的实地研究和教育活动。这个暑期项目将利用系内的地球化学分析实验室来培养本科生掌握最前沿的地球化学分析技术。这个暑期项目是以研究为导向的，要求参与的学生在导师的监督下使用现有的分析设备完成一个研究项目。PI提出了一个广泛的金属稳定同位素调查，包括Mg，Ca，Cr，Ti和Fe，对来自六个夏威夷火山的熔岩进行了充分研究。它们涵盖了夏威夷的整个成分和同位素范围，代表了在全球洋岛玄武岩中发现的大部分。新的金属稳定同位素数据，以及已发表的关于相同熔岩的地球化学数据，将使PI更好地了解（1）夏威夷羽流的地球化学结构，（2）夏威夷熔岩的岩石成因，以及（3）它们对羽流假说的影响。 PI正在积极招募学生进入暑期研究计划使用各种方法。UNLV多元化的学生团体确保了大部分参与学生将来自代表性不足的群体。拟议的研究和教育活动是协同的，因为PI计划（1）将拟议的研究的一部分用作暑期项目的学生项目，以及（2）招募合格和积极的学生通过这个夏季计划的培训工作，他提出的研究。这个奖项反映了NSF的法定使命，并已被认为是值得通过评估使用基金会的智力价值和更广泛的支持影响审查标准。

This CAREER project will focus on understanding the source of the magmas that erupt in Hawaii. Hawaiian volcanism is often used as the best example of magmatism formed by the rise of a mantle plume from deep in the Earth's interior. The mantle plume hypothesis provides an elegant interpretation for many intra-plate volcanism, such as Hawaii, which has been important in shaping the Earth’s surface and its biosphere throught Earth's history. However, many aspects of mantle plumes, and even their existence, remain highly debated. In this study, the investigator sets out to use several state-of-the-art geochemical and isotopic tracers to understand the evolution of Hawaiian volcanism, and its implications for the mantle plume hypothesis. Among those proposed tracers, he will conduct the systematic analysis of several novel metal stable isotope tracers on for a set of Hawaiian samples. The PI also plans a summer education program focusing on analytical geochemistry, which complements the existing strong field-oriented research and education activities in the Geoscience Department at the University of Nevada Las Vegas (UNLV). This summer program will leverage the geochemical analytical labs inside the department to train undergraduate students with the cutting-edge geochemical analytical techniques. This summer program is research oriented and requires the participating students to complete a research project using the available analytical facilities under the supervision of their faculty mentors.The PI proposes an extensive metal stable isotope investigation, including Mg, Ca, Cr, Ti, and Fe, on well-studied lavas from six Hawaiian volcanoes. They cover the whole compositional and isotopic ranges in Hawaii, which represent a large portion of those found in global ocean island basalts. The new metal stable isotope data, together with the published geochemical data on the same lavas, will allow the PI to better understand (1) the geochemical structure of the Hawaiian plume, (2) the petrogenesis of Hawaiian lavas, and (3) their implications to the plume hypothesis. The PI is actively recruiting students into the summer research program using a variety of approaches. The diverse student body at UNLV ensures that a large proportion of the participating students will be from underrepresented groups. The proposed research and education activities are synergistic, because the PI plans to (1) use part of the proposed research as student projects of the summer program, and (2) recruit qualified and motivated students trained through this summer program to work on his proposed research.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.