EAR-PF: Water in the Lower Mantle: Gaining Insight through Melt Generation and Deformation Textures
EAR-PF:下地幔中的水:通过熔化生成和变形纹理获得洞察
基本信息
- 批准号:1855336
- 负责人:
- 金额:$ 17.4万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2019
- 资助国家:美国
- 起止时间:2019-09-01 至 2021-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Dr. Cara Vennari has been granted an NSF EAR postdoctoral fellowship to carry out research and education plans at the University of Chicago and the University of Utah. Water has been studied extensively in the upper mantle, where it has been shown to lower the melting temperature of mantle rock and weaken it; however, there has been less systematic study of water in the lower mantle. Using diamond anvil cells to generate high pressures during laboratory experiments, she will investigate the melting temperature and strength of lower mantle rock with a variety of water content to advance our understanding of hydrous silicate melts and explain local anisotropic regions of the lower mantle. Broader impacts of this work include its direct application to other Earth science disciplines (geodynamics, petrology, geophysics, planetary sciences and geochemistry), mentorship of younger students, and volunteering through outreach programs. The overall goal of this project is to understand the effect of water in the lower mantle. The first is high pressure melting of synthetic pyrolite composition, with the goals being to determine (with a range of water content) the melting temperature, explore the stable phases, and probe the melt and recrystallized products for the cation and hydrous distribution. Hydrous melts and mineralogy have been assumed to affect the rheologic character of the lower mantle properties; however, there have been no experimental evidence to support this, so the second type of experiment will be an axial stress experiment at lower mantle pressures to investigate the deformation of hydrous peridotite. Techniques used for the melting measurements include in situ powder diffraction coupled with ex situ SEM analysis. Strength measurements of hydrated lower mantle phases will be investigated using X-ray diffraction with radial geometry.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.
Cara Vennari博士已获得NSF博士后奖学金,在芝加哥大学和犹他州大学开展研究和教育计划。上地幔中的水已被广泛研究,它已被证明可以降低地幔岩石的熔融温度并使其变弱;然而,下地幔中的水的系统研究较少。使用金刚石砧细胞在实验室实验中产生高压,她将研究具有各种含水量的下地幔岩石的熔化温度和强度,以促进我们对含水硅酸盐熔体的理解,并解释下地幔的局部各向异性区域。这项工作的更广泛影响包括其直接应用于其他地球科学学科(地球动力学,岩石学,地球物理学,行星科学和地球化学),指导年轻学生,并通过外展计划志愿服务。该项目的总体目标是了解下地幔中水的作用。第一个是合成地幔岩组合物的高压熔融,其目标是确定(具有一定范围的水含量)熔融温度,探索稳定相,并探测熔融产物和重结晶产物的阳离子和水合分布。含水熔体和矿物学被认为会影响下地幔性质的流变学特征;然而,没有实验证据支持这一点,因此第二类实验将是下地幔压力下的轴向应力实验,以研究含水橄榄岩的变形。用于熔融测量的技术包括原位粉末衍射结合非原位SEM分析。该奖项反映了NSF的法定使命,并已被认为是值得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的支持。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A high-pressure Raman study of FeTiO3 ilmenite: Fermi resonance as a manifestation of Fe-Ti charge transfer
FeTiO3 钛铁矿的高压拉曼研究:费米共振作为 Fe-Ti 电荷转移的表现
- DOI:10.1007/s00269-021-01151-9
- 发表时间:2021
- 期刊:
- 影响因子:1.4
- 作者:Vennari, Cara E.;Williams, Quentin
- 通讯作者:Williams, Quentin
Deformation and Strength of Mantle Relevant Garnets: Implications for the Subduction of Basaltic-rich Crust
与地幔相关的石榴石的变形和强度:对富含玄武质地壳俯冲的影响
- DOI:10.2138/am-2021-7587
- 发表时间:2021
- 期刊:
- 影响因子:3.1
- 作者:Vennari, C;Lin, F;Kunz, M;Akaogi, M;Miyagi, L;Williams, Q
- 通讯作者:Williams, Q
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Cara Vennari其他文献
Stability of the fcc phase in shocked nickel up to 332 GPa
冲击镍中 fcc 相在高达 332GPa 时的稳定性
- DOI:
10.1038/s41467-025-59385-y - 发表时间:
2025-05-12 - 期刊:
- 影响因子:15.700
- 作者:
Kimberly A. Pereira;Samantha M. Clarke;Saransh Singh;Richard Briggs;Christopher P. McGuire;Hae Ja Lee;Dimitri Khaghani;Bob Nagler;Eric Galtier;Eric Cunningham;David McGonegle;Sally J. Tracy;Cara Vennari;Martin G. Gorman;Amy L. Coleman;Carol Davis;Trevor Hutchinson;Jon H. Eggert;Raymond F. Smith;James P. S. Walsh - 通讯作者:
James P. S. Walsh
Towards single-shot, time-resolved tomography using a crystal-based, multi-beam X-ray split-and-delay line
使用基于晶体的多光束 X 射线分离延迟线实现单次时间分辨断层扫描
- DOI:
- 发表时间:
2023 - 期刊:
- 影响因子:0
- 作者:
C. Burcklen;Cara Vennari;Christopher Mcguire;Jennifer Alameda;Jeff Robinson;Andrew Aquila;Matthew H. Seaberg;K. Sokolowski;Thies J. Albert;Stefan P. Hau;B. Kozioziemski - 通讯作者:
B. Kozioziemski
Cara Vennari的其他文献
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