EAR-PF In-situ and bulk sulfur isotope constraints on crustal recycling: a bridged investigation of superdeep diamonds and ocean island basalts
EAR-PF 原位和散装硫同位素对地壳循环的限制:超深钻石和洋岛玄武岩的桥接研究
基本信息
- 批准号:2052944
- 负责人:
- 金额:$ 17.4万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Fellowship Award
- 财政年份:2022
- 资助国家:美国
- 起止时间:2022-01-01 至 2023-06-30
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Dr. James W. Dottin III has been awarded an NSF EAR Postdoctoral Fellowship to pursue research and education endeavors at the Carnegie Institution for Science-Earth and Planets Laboratory (CIS-EPL) under the mentorship of Dr. Steven Shirey and Dr. Michael Walter. The Earth’s crust, which can be transferred from the surface to the interior of Earth through plate tectonics, provides many of the chemical elements that control the habitability of life on our planet. However, the detailed nature, relative ages of the various crustal materials, and where they ultimately reside in the Earth’s interior are not well understood. For this project, Dr. Dottin will use chemical signatures (specifically those of the element sulfur) measured in rocks and minerals erupted from the deep interior of the Earth to provide insight into the finer details of plate tectonics. Dr. Dottin’s work involves analyzing rocks and diamonds that come from different parts of the Earth’s interior to determine how elements found in the crust move around and are distributed across the globe. The proposed research will use unique characteristics of sulfur to identify specific crustal materials that are recycled through the Earth’s interior and provide relative constraints on the timescales on which crustal recycling occurs. Dr. Dottin will also lead an education program that incorporates students from historically underrepresented minority groups directly into the research project. Student involvement will take form through a strong collaboration with Smith College, a women’s college in Massachusetts. Dr. Dottin also plans to engage with students that will be actively recruited from local high schools and the many Historically Black Colleges and Universities in the Washington, D.C. area as a mentor and advisor through a summer internship program at CIS-EPL. The Earth’s mantle is compositionally heterogeneous, comprising geochemically distinct reservoirs from the process of crust extraction and recycling of crust into the mantle. The HIMU (high μ=238U/204Pb) mantle reservoir is an enigmatic endmember with extreme Pb-isotopic compositions, and is postulated to be composed of subducted altered oceanic crust that is associated with a carbonated component. However, the nature, origin, and global distribution of the components that make up the HIMU mantle remain poorly understood. For this project, Dr. Dottin will combine sulfur isotope information from key HIMU basalts and from sulfide inclusions in superdeep diamonds using microbeam and bulk digestion techniques. Dr. Dottin aims to trace the global distribution and interaction of recycled protoliths in HIMU mantle reservoirs that are thought to reside at the base of the mantle and/or within the mantle transition zone. The proposed analytical techniques, choice of key HIMU basalts, and choice of sulfides from transition zone diamonds offers an opportunity to address the potential isotopic heterogeneities that exist among mineral, hand sample, and global scales. From this work, Dr. Dottin plans to provide insight into the finer details of plate tectonics through constraints of source heterogeneity among HIMU mantle reservoirs and the proposed depth of slab accumulation that is possibly linked to the age of the reservoir and/or hotspot location.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.
James W. Dottin III已被授予NSF博士后奖学金,在Steven Shirey博士和Michael Walter博士的指导下在卡内基科学研究所-地球和行星实验室(CIS-EPL)进行研究和教育工作。地壳可以通过板块构造从地球表面转移到地球内部,提供了许多控制地球上生命可居住性的化学元素。然而,各种地壳物质的详细性质、相对年龄以及它们最终在地球内部的位置还没有得到很好的了解。在这个项目中,Dottin博士将使用从地球内部深处喷发的岩石和矿物中测量的化学特征(特别是元素硫的化学特征),以深入了解板块构造的细节。Dottin博士的工作包括分析来自地球内部不同地区的岩石和钻石,以确定地壳中发现的元素如何在地球仪中移动和分布。拟议的研究将利用硫的独特特性来确定通过地球内部回收的特定地壳材料,并对地壳回收发生的时间尺度提供相对限制。Dottin博士还将领导一个教育项目,将历史上代表性不足的少数群体的学生直接纳入研究项目。学生的参与将通过与马萨诸塞州的女子学院史密斯学院的密切合作而形成。Dottin博士还计划与学生接触,这些学生将积极从当地高中和华盛顿,华盛顿特区地区的许多历史悠久的黑人学院和大学招募,通过CIS-EPL的暑期实习计划担任导师和顾问。地幔的成分是不均匀的,包括地球化学上不同的储层从地壳提取和再循环的过程中的地壳到地幔。HIMU(高μ= 238 U/204 Pb)地幔储层是一个具有极端Pb同位素组成的神秘端元,被认为是由与碳酸盐组分有关的俯冲蚀变洋壳组成。然而,组成HIMU地幔的成分的性质,起源和全球分布仍然知之甚少。在这个项目中,Dottin博士将利用微束和批量消化技术,联合收割机来自关键HIMU玄武岩和超深金刚石中硫化物包裹体的硫同位素信息。Dottin博士的目标是追踪HIMU地幔储层中回收原岩的全球分布和相互作用,这些储层被认为位于地幔底部和/或地幔过渡带内。建议的分析技术,选择的关键HIMU玄武岩,并选择从过渡区钻石硫化物提供了一个机会,以解决潜在的同位素不均匀性之间存在的矿物,手样品,和全球范围内。通过这项工作,Dottin博士计划通过HIMU地幔储层之间的源不均匀性的限制以及可能与储层年龄相关的板状堆积的拟议深度,提供对板块构造更精细细节的洞察,和/或该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查进行评估,被认为值得支持的搜索.
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Isotopic evidence of sulfur photochemistry during lunar regolith formation
月球风化层形成过程中硫光化学的同位素证据
- DOI:10.7185/geochemlet.2235
- 发表时间:2022
- 期刊:
- 影响因子:4.9
- 作者:Dottin III, J.W.;Farquhar, J.;Kim, S.-T.;Shearer, C.;Wing, B.;Sun, J.;Ni, P.
- 通讯作者:Ni, P.
Near-zero 33S and 36S anomalies in Pitcairn basalts suggest Proterozoic sediments in the EM-1 mantle plume
- DOI:10.1016/j.epsl.2022.117422
- 发表时间:2022-04
- 期刊:
- 影响因子:5.3
- 作者:Jabrane Labidi;J. Dottin;M. Clog;C. Hemond;P. Cartigny
- 通讯作者:Jabrane Labidi;J. Dottin;M. Clog;C. Hemond;P. Cartigny
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James Dottin其他文献
Volatiles in olivine-hosted melt inclusions from a rejuvenated Oʻahu tephra: Degree of melting controls the primary melt COsub2/sub content—And extent of Hsub2/subO degassing—Of OIB
来自一个复兴的瓦胡岛凝灰岩橄榄石寄主熔体包裹体中的挥发分:熔融程度控制了原生熔体的二氧化碳含量——以及大洋中脊玄武岩的水蒸汽脱气程度。
- DOI:
10.1016/j.chemgeo.2024.122604 - 发表时间:
2025-04-05 - 期刊:
- 影响因子:3.600
- 作者:
Olivia E. Anderson;Matthew G. Jackson;James Dottin;Sunna Harðardóttir;Kenneth T. Koga;Gareth Seward;John Cottle;Estelle F. Rose-Koga;Natália Gauer-Pasqualon - 通讯作者:
Natália Gauer-Pasqualon
James Dottin的其他文献
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{{ truncateString('James Dottin', 18)}}的其他基金
EA: Acquisition of an IRMS for sulfur isotope measurements
EA:获取用于硫同位素测量的 IRMS
- 批准号:
2312791 - 财政年份:2023
- 资助金额:
$ 17.4万 - 项目类别:
Standard Grant
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