Element Partitioning at Earth's Deep Chemical Boundaries

地球深层化学边界的元素分配

• 批准号: 1447311
• 负责人: Yingwei Fei
• 金额: $ 40.02万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-04-15 至 2019-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1447311&HistoricalAwards=false
• 关键词: Element; Partitioning; Earth; Deep; Chemical

The Earth's core-mantle boundary (CMB) and inner core boundary (ICB) are the most important deep chemical boundaries that define the dynamics of the interior and control the generation of Earth magnetic field. The boundaries reset the element redistribution through metal-silicate differentiation and inner crystallization. The goal of this study is to understand the behavior of element partitioning at these boundaries using newly developed high-pressure and temperature techniques and state-of-the-art analytical tools that allow simulating the conditions of the boundaries and analyzing the chemical compositions of the coexisting phases in the recovered samples. The proposed work will significantly advance our knowledge of Earth's deep processes and experimental techniques to investigate element redistribution at deep chemical boundaries.The focus of the proposed research is on the silicon (Si) and oxygen (O) partitioning between mantle and core at high pressure and temperature, applicable to core-mantle differentiation and the incorporation of Si and O in the core. Specific projects include (1) determining the Si and O partitioning between liquid mantle silicate and molten core iron alloy up to CMB pressure, and (2) determining the effect of pressure on the Si, O, and S partitioning coefficients between solid and liquid iron alloy and examining their partitioning behavior at ICB conditions. The research will produce high-quality data under extreme conditions that are necessary for understanding the chemistry of Earth's core and providing insight into the Earth accretion environment and the evolution of Earth's interior. It will open new research opportunities at the interface of petrology, mineral physics, geochemistry, and geophysics.

地核-地幔边界（CMB）和内核边界（ICB）是最重要的深部化学边界，它们决定着地球内部的动力学，控制着地球磁场的产生。边界通过金属硅酸盐分异和内部结晶重新设定元素重分配。本研究的目的是利用新开发的高压和温度技术以及最先进的分析工具来了解这些边界上元素分配的行为，这些分析工具可以模拟边界的条件并分析回收样品中共存相的化学成分。这项工作将大大提高我们对地球深部过程的认识和实验技术，以研究深部化学边界的元素再分配。本文拟研究的重点是在高压高温下地幔与地核之间硅（Si）和氧(O)的分配，适用于核幔分异和Si、O在地核中的掺入。具体项目包括：(1)确定CMB压力下液态地幔硅酸盐与熔融铁合金之间Si、O的分配；(2)确定压力对固态铁合金与液态铁合金之间Si、O、S分配系数的影响，并研究其在ICB条件下的分配行为。这项研究将在极端条件下产生高质量的数据，这些数据对于了解地核的化学成分和深入了解地球吸积环境和地球内部的演变是必要的。它将在岩石学、矿物物理学、地球化学和地球物理学的界面上开辟新的研究机会。

项目成果

High-pressure experimental constraints of partitioning behavior of Si and S at the Mercury's inner core boundary

• DOI: 10.1016/j.epsl.2021.116849
• 发表时间: 2021-05
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Renbiao Tao;Y. Fei

Incompatibility of argon during magma ocean crystallization

岩浆海结晶过程中氩的不相容性

• DOI: 10.1016/j.epsl.2020.116598
• 发表时间: 2021
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Jackson, Colin R.M.;Williams, Curtis D.;Du, Zhixue;Bennett, Neil R.;Mukhopadhyay, Sujoy;Fei, Yingwei
• 通讯作者: Fei, Yingwei

Recycled calcium carbonate is an efficient oxidation agent under deep upper mantle conditions

• DOI: 10.1038/s43247-021-00116-8
• 发表时间: 2021-02
• 期刊: Communications Earth & Environment
• 影响因子: 7.9
• 作者: Renbiao Tao;Y. Fei