CSEDI: Cooperative Studies of Electrochemistry at the Core-Mantle Boundary

CSEDI：核幔边界电化学合作研究

• 批准号: 0112448
• 负责人: Abby Kavner
• 金额: $ 9.61万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-08-01 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0112448&HistoricalAwards=false
• 关键词: CSEDI; Cooperative; Studies; Electrochemistry; Core

Kavner 0112448 The investigators plan to provide an examination of the Earth's core-mantle boundary as an electrochemical system. They will undertake a series of piston-cylinder experiments designed to investigate the effect of an electric field on the physical and chemical behavior at metal-silicate interfaces. Both DC resistance measurements and AC impedance spectroscopy will be employed to examine the electrical behavior of a metal-silicate interface, and electron microprobe analysis will record changes in chemistry for a series of anodic and cathodic electrical loadings of the interface. These results will be used, in turn, to show how differences in chemistry and physical properties overlying local areas of the core-mantle boundary may translate into geophysical and geochemical observables such as length of day variations, the behavior of the magnetic field dynamo, and creation of physical and chemical structure in the outer core and lower mantle. The goal is to extend our understanding of the core-mantle boundary to encompass electrical and electrochemical behavior at high pressures and temperatures, examining both electrically-induced chemical partitioning and resultant core-mantle dynamic coupling.

研究人员计划将地核-地幔边界作为一个电化学系统进行检查。他们将进行一系列的活塞缸实验，旨在研究电场对金属-硅酸盐界面的物理和化学行为的影响。直流电阻测量和交流阻抗谱将被用于检查金属-硅酸盐界面的电学行为，电子探针分析将记录界面的一系列阳极和阴极电负荷的化学变化。反过来，这些结果将用于展示覆盖在地核-地幔边界局部区域上的化学和物理性质的差异如何转化为地球物理和地球化学观测结果，如日长变化、磁场发电机的行为，以及外核和下地幔中物理和化学结构的形成。目标是扩展我们对核心-地幔边界的理解，以涵盖高压和高温下的电和电化学行为，检查电诱导的化学分配和由此产生的核心-地幔动态耦合。