EAR-PF: Hydrogen in the Earth's transition zone: Merging experimental and theoretical approaches

EAR-PF：地球过渡带中的氢：实验和理论方法的结合

• 批准号: 1725673
• 负责人: Elizabeth Thompson
• 金额: $ 8.7万
• 依托单位: Thompson Elizabeth C
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-05-01 至 2021-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1725673&HistoricalAwards=false
• 关键词: EAR; PF; Hydrogen; Earth; transition

Dr. Elizabeth C. Thompson has been granted an NSF EAR Postdoctoral Fellowship to carry out research and education plans at Northwestern University. The investigation will determine the pressure and temperature stability field for aluminum-bearing super hydrous magnesium silicates minerals. The results of this study will help constrain the quantity and location of water in the Earth's transition zone and mantle (410-660 Km depth), a region of the Earth ~100 times more massive than the Earth's crust. The education plan will focus on mentoring, developing teaching materials and lectures, and outreach. Dr. Thompson will also collaborate with scientists at Ehime University in Japan.This project evaluates aluminum substitution in high-pressure superhydrous phase B, using several complementary techniques, including: (1) first-principles calculations, (2)synchrotron-based infrared spectroscopy, (3) Raman spectroscopy and (4) single crystal diffraction. These findings will impact deep Earth geochemistry in a wide-ranging sense, as Al-rich superhydrous phase B either ushers hydrogen through the transition zone and into the lower mantle or decomposes, releasing H2O depending on its P-T stability. Fluxed melts resulting from the decomposition of superhydrous phase B would produce chemical heterogeneities in the mantle. Additionally, dehydration melts may potentially influence plate tectonics due to the effect of hydrogen on melting temperatures and viscosity. This study will also explore the effect of Al-substitution on pressure-induced hydrogen bond symmetrization in superhydrous phase B, a phenomenon previously reported to have a significant influence on a mineral's bulk material properties including bulk modulus and its pressure derivative.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.

伊丽莎白·C·汤普森（Elizabeth C. Thompson）博士已获得NSF耳朵博士后奖学金，以在西北大学执行研究和教育计划。该研究将确定含铝的超级含水镁矿物质的压力和温度稳定性场。这项研究的结果将有助于限制地球过渡区和地幔中水的数量和位置（410-660 km深度），地球的一个区域是地壳的大约100倍。教育计划将着重于指导，开发教材和讲座以及宣传。汤普森博士还将使用多种互补技术评估高压超水B中的铝替代铝替代铝，包括：（1）基于同步体的红外光谱，（（3）Raman Spectroscoppy和（4）单晶diffraction。这些发现将以广泛的含义影响深层地球化学，因为富含Al的超级水相B可以通过过渡区引入氢，然后进入下地幔或分解，根据其P-T稳定性释放H2O。由超液相B分解产生的通量熔体会在地幔中产生化学异质性。此外，由于氢对熔融温度和粘度的影响，脱水融化可能会影响板块构造。这项研究还将探讨Al-substition对超水相B中压力诱导的氢键对称的影响，这种现象先前据报道对矿物质的大量材料具有重大影响，包括大量模量及其压力导数。该奖项通过评估NSF的法定范围，反映了对概念的支持，并且已被评估概念范围。

项目成果

Calculated Elasticity of Al-Bearing Phase D

• DOI: 10.3390/min12080922
• 发表时间: 2022-07
• 期刊: Minerals
• 影响因子: 2.5
• 作者: E. Thompson;A. Campbell;J. Tsuchiya

High-pressure crystal structure and equation of state of ferromagnesian jeffbenite: implications for stability in the transition zone and uppermost lower mantle

• DOI: 10.1007/s00410-021-01850-0
• 发表时间: 2021-10
• 期刊: Contributions to Mineralogy and Petrology
• 影响因子: 3.5
• 作者: Fei Wang;E. Thompson;Dongzhou Zhang;E. Alp;Jiyong Zhao;J. Smyth;S. Jacobsen

Experimental thermal equation of state of B2−KCl

B2→KCl的实验热状态方程

• DOI: 10.1103/physrevb.104.094107
• 发表时间: 2021
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Chidester, B. A.;Thompson, E. C.;Fischer, R. A.;Heinz, D. L.;Prakapenka, V. B.;Meng, Y.;Campbell, A. J.
• 通讯作者: Campbell, A. J.

Phase transitions in ε-FeOOH at high pressure and ambient temperature

高压和环境温度下 ε-FeOOH 的相变

• DOI: 10.2138/am-2020-7468
• 发表时间: 2020
• 期刊: American Mineralogist
• 影响因子: 3.1
• 作者: Thompson, Elizabeth C.;Davis, Anne H.;Brauser, Nigel M.;Liu, Zhenxian;Prakapenka, Vitali B.;Campbell, Andrew J.
• 通讯作者: Campbell, Andrew J.

Elastic Properties of the Pyrite‐Type FeOOH‐AlOOH System From First‐Principles Calculations

根据第一原理计算黄铁矿型 FeOOH-AlOOH 体系的弹性性质

• DOI: 10.1029/2021gc009703
• 发表时间: 2021
• 期刊: Geosystems
• 作者: Thompson, Elizabeth C.;Campbell, Andrew J.;Tsuchiya, Jun
• 通讯作者: Tsuchiya, Jun