Determination of Equilibrium Iron Isotope Fractionation Factors at High Pressure

高压下平衡铁同位素分馏因子的测定

基本信息

  • 批准号:
    1464005
  • 负责人:
  • 金额:
    $ 9.94万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2015
  • 资助国家:
    美国
  • 起止时间:
    2015-04-15 至 2020-03-31
  • 项目状态:
    已结题

项目摘要

Understanding the composition of the Earth is crucial to constraining under which conditions it formed along with the rest of the solar system. The more we can learn about the Earth, the better suited we are to understanding how planets form in general and why the planets are all so different. Many elements that are abundant on Earth have stable isotopes (same number of protons, different number of neutrons) that have been studied extensively for their use as tracers for physical and chemical processes. However these isotopes have largely not been explored for how they can trace processes occurring at high pressure, such as during the formation of our planet's core. This proposal is aimed at studying the composition of the core of the Earth through experiments at high pressure and theoretical calculations of the isotopic ratios. The goal is to place an independent constraint on the composition of the core, which has critical implications on the formation and evolution of our planet. The principle of using stable isotopes to probe the bulk chemical composition of planets lies with the combination of isotope fractionation and sequestration of elements in inaccessible reservoirs like the Earth's core. Experiments at high pressure and temperature can reveal the equilibrium isotopic fractionation factors that cannot be directly measured in planetary materials and when combined with isotopic ratios found in natural materials provide a constraint on the formation conditions of those materials. The principal aim of this proposal is to understand how the light elements bonded to iron in the core can affect the distribution of isotopes during core formation. Ths Pis will do this by determining how various phases (Fe3C, FeO, FeS, FeHx) isotopic fractionation factors are affected by pressure. This study relies on mineral physics techniques and experiments (DAC experiments at the synchrotron using nuclear resonant inelastic x-ray scattering) combined with isotope geochemistry calculations and analyses. It is a truly interdisciplinary project that can only be accomplished with the right expertise and has the potential to make a large imprint on several fields of geoscience. The main research goals of this proposal are to: reveal how iron stable isotope ratios under extreme pressure conditions can be used to understand planet formation and differentiation; determine the effect of bonding partners on iron stable isotope fractionation so as to investigate the light element in cores of differentiated objects; and calculate theoretical iron isotopic fractionation factors based on high pressure NRIXS synchrotron experiments.
了解地球的组成对于限制它与太阳系其他部分在什么条件下形成至关重要。我们对地球的了解越多,我们就越适合理解行星是如何形成的,以及为什么行星都是如此不同。地球上丰富的许多元素都有稳定的同位素(相同数量的质子,不同数量的中子),这些元素被广泛研究,因为它们被用作物理和化学过程的示踪剂。然而,这些同位素在很大程度上还没有被探索,以了解它们如何追踪在高压下发生的过程,例如在我们的行星核心形成期间。这一提议旨在通过高压实验和同位素比率的理论计算来研究地核的组成。其目标是对核心的组成施加独立的限制,这对我们星球的形成和演化具有关键影响。使用稳定同位素探测行星整体化学成分的原理在于同位素分馏和元素在地核等难以接近的储藏库中的封存相结合。在高压和高温下的实验可以揭示在行星物质中无法直接测量的平衡同位素分馏系数,当与在自然物质中发现的同位素比率相结合时,可以限制这些物质的形成条件。这一建议的主要目的是了解在核心形成过程中与铁结合的轻元素如何影响同位素的分布。PIS将通过确定不同相(Fe3C、FeO、FeS、FeHx)的同位素分馏系数如何受压力影响来实现这一点。这项研究依赖矿物物理技术和实验(在同步加速器使用核共振非弹性x射线散射的DAC实验),并结合同位素地球化学计算和分析。这是一个真正的跨学科项目,只有在适当的专业知识下才能完成,并有可能在地球科学的几个领域产生巨大的影响。这一提议的主要研究目标是:揭示如何利用极端压力条件下的铁稳定同位素比率来理解行星的形成和分化;确定键对对铁稳定同位素分馏的影响,从而研究分异物体核心中的轻元素;以及基于高压NRIXS同步加速器实验计算理论铁同位素分馏因子。

项目成果

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Wendy Mao其他文献

Harnessing innovative machine learning techniques to combat drug resistance in solid tumors
  • DOI:
    10.1186/s12967-025-06390-w
  • 发表时间:
    2025-04-03
  • 期刊:
  • 影响因子:
    7.500
  • 作者:
    Hao Zhang;Wendy Mao
  • 通讯作者:
    Wendy Mao

Wendy Mao的其他文献

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{{ truncateString('Wendy Mao', 18)}}的其他基金

Collaborative Research: From Silicate Melts Properties to the Dynamics and Evolution of an Early Basal Magma Ocean
合作研究:从硅酸盐熔体特性到早期基底岩浆洋的动力学和演化
  • 批准号:
    2153918
  • 财政年份:
    2022
  • 资助金额:
    $ 9.94万
  • 项目类别:
    Standard Grant
Geophysics of Iron in the Earth’s Core
地核中铁的地球物理学
  • 批准号:
    2049620
  • 财政年份:
    2021
  • 资助金额:
    $ 9.94万
  • 项目类别:
    Standard Grant
Geophysics of Iron in the Earth's Core
地核铁的地球物理学
  • 批准号:
    1446969
  • 财政年份:
    2015
  • 资助金额:
    $ 9.94万
  • 项目类别:
    Continuing Grant
Geophysics of Iron in the Earth's Core
地核铁的地球物理学
  • 批准号:
    1141929
  • 财政年份:
    2012
  • 资助金额:
    $ 9.94万
  • 项目类别:
    Standard Grant
CAREER: Visualizing Earth's Core-Mantle Interactions using Nanoscale X-ray Tomography
职业:使用纳米级 X 射线断层扫描可视化地球的核心-地幔相互作用
  • 批准号:
    1055454
  • 财政年份:
    2011
  • 资助金额:
    $ 9.94万
  • 项目类别:
    Continuing Grant
Geophysics of Iron in the Earth's D" Layer and Core
地球 D" 层和地核中铁的地球物理学
  • 批准号:
    0738873
  • 财政年份:
    2008
  • 资助金额:
    $ 9.94万
  • 项目类别:
    Continuing Grant

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