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: 1942042
• 负责人: Shichun Huang
• 金额: $ 55.82万
• 依托单位: University of Nevada Las Vegas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-02-01 至 2022-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1942042&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 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.

这个职业项目将专注于了解夏威夷喷发的岩浆的来源。夏威夷火山活动经常被用作岩浆作用的最佳例子，岩浆作用是由地幔热柱从地球内部深处上升形成的。地幔热柱假说为许多板内火山活动提供了优雅的解释，例如夏威夷，在地球历史上一直在塑造地球表面及其生物圈方面发挥着重要作用。然而，地幔热柱的许多方面，甚至它们的存在，仍然存在着激烈的争论。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，以及它对地幔热柱假说的影响。在这些建议的示踪剂中，他将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。国际和平研究所还计划开展一项以分析地球化学为重点的暑期教育计划，以补充内华达大学拉斯维加斯分校(UNLV)地球科学系现有强大的以实地为导向的研究和教育活动。这个暑期项目将利用系内的地球化学分析实验室来培训本科生掌握尖端的地球化学分析技术。这个暑期项目是以研究为导向的，要求参与的学生在他们的教师指导下使用可用的分析设施完成一个研究项目。PI建议对来自六个夏威夷火山的经过充分研究的熔岩进行广泛的金属稳定同位素调查，包括镁、钙、铬、钛和铁。它们覆盖了夏威夷的整个成分和同位素范围，占全球洋岛玄武岩中发现的很大一部分。新的金属稳定同位素数据，以及已公布的关于同一熔岩的地球化学数据，将使PI能够更好地理解(1)夏威夷岩柱的地球化学结构，(2)夏威夷熔岩的岩石成因，以及(3)它们对岩柱假说的影响。PI正在积极招募学生参加暑期研究项目，方法多种多样。联合国志愿人员组织的学生群体多种多样，这确保了很大比例的参与学生将来自代表性不足的群体。建议的研究和教育活动是协同的，因为PI计划(1)使用部分建议的研究作为暑期计划的学生项目，以及(2)招募通过该暑期计划培训的合格和有积极性的学生来从事他的建议的研究。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势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

Machine Learning Investigation of Clinopyroxene Compositions to Evaluate and Predict Mantle Metasomatism Worldwide

• DOI: 10.1029/2021jb023614
• 发表时间: 2022-05
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: Ben Qin;Fang Huang;Shichun Huang;André Python;Yunfeng Chen;J. ZhangZhou

Sulfur isotopic signature of Earth established by planetesimal volatile evaporation

通过星子挥发性蒸发建立的地球硫同位素特征

• DOI: 10.1038/s41561-021-00838-6
• 发表时间: 2021
• 期刊: Nature Geoscience
• 影响因子: 18.3
• 作者: Wang, Wenzhong;Li, Chun-Hui;Brodholt, John P.;Huang, Shichun;Walter, Michael J.;Li, Min;Wu, Zhongqing;Huang, Fang;Wang, Shui-Jiong
• 通讯作者: Wang, Shui-Jiong

Discovery of davemaoite, CaSiO 3 -perovskite, as a mineral from the lower mantle

发现了来自下地幔的 davemaoite（CaSiO 3 -钙钛矿）

• DOI: 10.1126/science.abl8568
• 发表时间: 2021
• 期刊: Science
• 影响因子: 56.9
• 作者: Tschauner, Oliver;Huang, Shichun;Yang, Shuying;Humayun, Munir;Liu, Wenjun;Gilbert Corder, Stephanie N;Bechtel, Hans A.;Tischler, Jon;Rossman, George R.
• 通讯作者: Rossman, George R.

Pressure and concentration effects on intermineral calcium isotope fractionation involving garnet

• DOI: 10.1016/j.chemgeo.2022.120722
• 发表时间: 2022-01
• 期刊: Chemical Geology
• 影响因子: 3.9
• 作者: Yonghui Li;ZhongqingWu;Shichun Huang;Wenzhong Wang

Response to Comment on “Discovery of davemaoite, CaSiO 3 -perovskite, as a mineral from the lower mantle”

对“发现来自下地幔的矿物 davemaoite、CaSiO 3 -钙钛矿”的评论的回应

• DOI: 10.1126/science.abo2029
• 发表时间: 2022
• 期刊: Science
• 影响因子: 56.9
• 作者: Tschauner, Oliver;Huang, Shichun;Humayun, Munir;Liu, Wenjun;Rossman, George R.
• 通讯作者: Rossman, George R.