Collaborative Project: EaGER - CSEDI: Towards an integrated view of deep mantle structure, temperature, and composition

合作项目：EaGER - CSEDI：对深部地幔结构、温度和成分的综合看法

• 批准号: 1341862
• 负责人: Renata Wentzcovitch
• 金额: $ 13.12万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-07-01 至 2015-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1341862&HistoricalAwards=false
• 关键词: Collaborative; Project; EaGER; CSEDI; Towards

This Early Grant for Exploratory Research (EaGER) will support a collaborative study between mineral physicists and seismologists to try a new approach of combining mineral physics and seismology to provide new perspectives of the deep Earth. Advances in seismic imaging of the Earth's deep interior, from global to local scales, are providing structural information about convective and thermal patterns in the lower mantle. Development of first principles methodologies to tackle key mineral physics problems, e.g., thermoelastic properties, spin crossover in iron in lower mantle minerals, and anharmonic thermal properties, are greatly expanding characterization of mineral properties at deep mantle conditions.The goal and primary intellectual merit of the proposed work is to advance understanding of deep mantle structure, temperature, and composition with a transformative multidisciplinary effort to directly link seismological imaging with modeling approaches based on realistic mineral properties. The team will address an unresolved central issue in investigations of deep mantle temperature and composition: the subtle effects of spin state changes in iron in lower mantle minerals and potential seismological detection of this fundamental transition and corresponding implications for bulk chemistry of the lower mantle. Clarification of the seismic signature of spin state crossovers is a major hurdle to be overcome in mineralogical interpretations of seismological data of the deep Earth. The proposed search for spin transition signatures in the deep mantle is not without risks, but this unprecedented joint seismology/mineral-physics enterprise will pave the way for future studies of numerous fascinating structures holding keys to the nature of the deep mantle. It will open a needed first-hand dialogue between these communities and enable elasticity data to be accessible online for use by the seismology community for modeling purposes. The PIs of this study have diverse expertise that will help the team to foster a multi-disciplinary education experience at the interface between seismology and mineral physics.

这项探索性研究的早期赠款（急切）将支持矿物物理学家和地震学家之间的合作研究，以尝试将矿物质物理学和地震学结合起来的新方法，以提供深层地球的新观点。从全球到局部尺度的地球深内部的地震成像的进步正在提供有关下层中对流和热模式的结构信息。开发解决关键矿物物理问题的方法论，例如热弹性特性，下幔矿物质中铁的旋转跨界以及Anharmonic的热能性能，在深壁炉条件下的矿物质表征大大扩展。拟议的工作是通过具有变革性的多学科努力来提高对深层结构，温度和成分的了解，以将地震学成像与基于现实矿物质的建模方法直接联系起来。该团队将在研究深幔温度和成分的研究中解决一个尚未解决的中心问题：下层矿物质中铁的旋转状态变化的微妙影响，以及这种基本过渡的潜在地震学检测以及对下层底座的散装化学的相应含义。阐明旋转状态交叉的地震特征是在深层地震数据的矿物学解释中克服的一个主要障碍。在深幔中寻找旋转过渡特征的拟议搜索并非没有风险，但是这种前所未有的联合地震学/矿物质 - 物理企业将为未来的研究铺平道路，以对许多迷人的结构持有钥匙，以掌握深层地幔的性质。它将在这些社区之间开设必要的第一手对话，并使可以在线访问弹性数据，以供地震学社区用于建模。这项研究的PI具有多种专业知识，可以帮助团队在地震学和矿物质物理学之间的界面上培养多学科的教育经验。