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

职业：夏威夷熔岩的岩石成因，金属稳定同位素的限制

• 批准号: 2244895
• 负责人: Shichun Huang
• 金额: $ 55.82万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2025-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2244895&HistoricalAwards=false
• 关键词: CAREER; Petrogenesis; Hawaiian; lavas; Constraints

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 through 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 winter education program focusing on analytical geochemistry, which will leverage the geochemical analytical labs inside the department to train undergraduate students with the cutting-edge geochemical analytical techniques. This winter 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 a winter research program using a variety of approaches. The diverse student body at UTK 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 winter program, and (2) recruit qualified and motivated students trained through this winter 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.

这个职业项目将重点了解夏威夷喷发的岩浆的来源，夏威夷火山活动通常被用作地幔柱从地球内部深处升起形成的岩浆作用的最佳例子，地幔柱假说提供了一个优雅的假设。对许多板内火山活动的解释，例如夏威夷，它在地球历史上对塑造地球表面及其生物圈发挥了重要作用。然而，地幔柱的许多方面，甚至它们的存在，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化及其对地幔柱假说的影响。对一组夏威夷样品进行几种新型金属稳定同位素示踪剂的系统分析 该项目负责人还计划开展一个以分析地球化学为重点的冬季教育计划，该计划将利用该部门内的地球化学分析实验室进行培训。该冬季项目以研究为导向，要求参与的学生在导师的监督下使用现有的分析设施完成一个研究项目。PI 提议进行广泛的金属稳定同位素研究，包括镁、钙、铬、钛和铁，来自夏威夷六座火山经过充分研究的熔岩，它们覆盖了夏威夷的整个成分和同位素范围，代表了全球海洋岛屿中发现的大部分成分和同位素范围。新的金属稳定同位素数据以及已发布的同一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 正在积极招募学生参加冬季研究项目，UTK 的多元化学生群体确保了大部分参与学生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) 将拟议研究的一部分用作冬季项目的学生项目，以及 (2) 招募通过本冬季项目培训的合格且积极主动的学生来从事他拟议的研究该奖项反映了 NSF 的法定使命，并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，被认为值得支持。

项目成果

Chalcogen isotopes reveal limited volatile contribution from late veneer to Earth

硫属元素同位素揭示了晚单板对地球的挥发性贡献有限

• DOI: 10.1126/sciadv.adh0670
• 发表时间: 2023-12-08
• 期刊: Science Advances
• 影响因子: 13.6
• 作者: Wang, Wenzhong;Walter, Michael J.;Brodholt, John P.;Huang, Shichun;Petaev, Michail I.
• 通讯作者: Petaev, Michail I.

Empirical constraints on the mass dependence of isotope diffusion in minerals by modeling sub-solidus exchange: Calcium isotopes in the two-pyroxene system

通过模拟亚固相线交换对矿物中同位素扩散的质量依赖性进行经验约束：二辉石系统中的钙同位素

• DOI: 10.1016/j.gca.2022.11.022
• 发表时间: 2022-11-01
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Z. Xiong;Shichun Huang;James A. Van Orman
• 通讯作者: James A. Van Orman

First-principles investigation of equilibrium magnesium isotope fractionation among mantle minerals: Review and new data

地幔矿物平衡镁同位素分馏的第一性原理研究：回顾和新数据

• DOI: 10.1016/j.earscirev.2023.104315
• 发表时间: 2023-01-01
• 期刊: Earth-Science Reviews
• 影响因子: 12.1
• 作者: Wenzhong Wang;Zhongqing Wu;Shichun Huang;Fang Huang
• 通讯作者: Fang Huang