EAGER: Mantle Rheology and the Dynamics of Suboceanic Mantle: A Bottom-Up Approach

EAGER：地幔流变学和海底地幔动力学：自下而上的方法

• 批准号: 1417327
• 负责人: Jun Korenaga
• 金额: $ 20.56万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-04-01 至 2017-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1417327&HistoricalAwards=false
• 关键词: EAGER; Mantle; Rheology; Dynamics; Suboceanic

The pattern of flow in the mantle cannot be observed directly but is informed by implementing models of known physical behavior of Earth materials in computer simulations. There are uncertainties associated with this approach and this project targets one of them- the imperfect knowledge about how mantle minerals deform. Laboratory studies provide constraints but both the direct measurements and the inferred material flow laws have uncertainty. A quantitative description of this uncertainty in microscopic behavior will, for the first time, be included directly in the macro-scale mantle flow simulations. This will result in a probabilistic description of the model spaces relevant for the Earth for a range of likely constituent architectures. Local mineral deformation mechanism, grain size, potential temperature, pressure, water, and melt are all known to affect stress-strain relations in mantle rock. A previously developed Bayesian method will be modified to allow various architectures to be included. A graduate student will receive training at a forefront of numerical modeling in geophysics and will gain insight to laboratory results- a cross disciplinary background that is not typical in most departments. A website will be developed for researchers to query for self-consistent descriptions of mantle flow law specification.

地幔中的流动模式无法直接观察到，但可以通过在计算机模拟中实现地球物质已知物理行为的模型来了解。这种方法存在着不确定性，而本项目的目标就是其中之一--关于地幔矿物如何变形的不完善的知识。实验室研究提供了限制，但直接测量和推断的物质流动规律具有不确定性。在微观行为的这种不确定性的定量描述，将首次直接包括在宏观尺度地幔流模拟。这将导致一系列可能的组成架构的地球相关的模型空间的概率描述。已知局部矿物变形机制、粒度、位温、压力、水和熔体都会影响地幔岩石中的应力-应变关系。以前开发的贝叶斯方法将被修改，以允许各种架构被包括在内。研究生将接受培训，在数值模拟的前沿物理学，并将获得深入了解实验室结果-一个跨学科的背景，这是不典型的，在大多数部门。将开发一个网站，供研究人员查询地幔流定律规范的自洽描述。