Models of Flow and Geochemical Transport in the Earth

地球中的流动和地球化学传输模型

• 批准号: 9814666
• 负责人: Richard O'Connell
• 金额: $ 20万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-12-01 至 2001-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9814666&HistoricalAwards=false
• 关键词: Models; Flow; Geochemical; Transport; Earth

9814666 O'Connell The proposed research is to study flow and chemical transport in the mantle resulting from convection and plate tectonics. It is motivated by the discordant inferences about mantle structure from geophysical observations of seismic structure and the geoid, and geochemical observations of isotopes in basalts at mid-ocean ridges and ocean islands. This is a major discrepancy in our understanding of mantle dynamics and evolution. The work will involve the calculation of mass transport, stirring and deformation in simple convective systems that incorporate lithospheric plate motions, evolution of plate geometry, viscosity variations with depth, as well as rheological heterogeneities. The proposed work will evaluate these effects and assess the likelihood that such processes can account for the diverse geophysical and geochemical observations.

9814666 O 'Connell拟议的研究是研究对流和板块构造引起的地幔中的流动和化学输运。 它的动机是从地震结构和大地水准面的地球物理观测和大洋中脊和洋岛玄武岩同位素的地球化学观测中得出的关于地幔结构的不一致推断。 这是我们对地幔动力学和演化理解的一个主要差异。 这项工作将涉及计算简单对流系统中的质量输运、搅拌和变形，其中包括岩石圈板块运动、板块几何形状的演变、粘度随深度的变化以及流变学的不均匀性。 拟议的工作将评估这些影响，并评估这些过程可以解释各种地球物理和地球化学观测的可能性。