Chemical influences on the seismic structure of the Earth's upper mantle

化学对地球上地幔地震结构的影响

• 批准号: DP200100824
• 负责人: Prof Ian Jackson
• 金额: $ 17.67万
• 依托单位: The Australian National University
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2020
• 资助国家: 澳大利亚
• 起止时间: 2020-05-10 至 2024-12-31
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP200100824
• 关键词: Chemical; influences; seismic; structure; Earth

This project aims to determine the sensitivity of the seismic properties of Earth’s upper mantle (to 400 km depth) to variations in the prevailing chemical environment. The unique capability of the ANU Rock Physics Laboratory for low-frequency measurement of wave speeds and attenuation will be exploited to clarify the newly discovered importance of redox conditions, and document the effect of varying proportions of the most abundant upper-mantle minerals olivine and pyroxene. The expected outcome will be a robust and comprehensive model to guide the interpretation of the complex architecture of the upper mantle, and thereby provide an improved understanding of the tectonic processes responsible for its evolution through geological time.

该项目旨在确定地球上地幔（至 400 公里深度）的地震特性对当前化学环境变化的敏感性，澳大利亚国立大学岩石物理实验室低频测量波速和衰减的独特能力将得到体现。利用它来阐明新发现的氧化还原条件的重要性，并记录不同比例的最丰富的上地幔矿物橄榄石和辉石的影响，预期的结果将是一个强大而全面的模型来指导解释。上地幔的复杂结构，从而更好地了解负责其整个地质时期演化的构造过程。