CSEDI: Geochemical and Geodynamical Studies of Earth Evolution

CSEDI：地球演化的地球化学和地球动力学研究

• 批准号: 0112563
• 负责人: Stein Jacobsen
• 金额: $ 16.5万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-15 至 2005-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0112563&HistoricalAwards=false
• 关键词: CSEDI; Geochemical; Geodynamical; Studies; Earth

Jacobsen 0112563 The investigators will work on several closely related subjects that will address important problems with respect to the structure and chemical and dynamical evolution of the Earth's mantle. The work will entail a combination of approaches using geochemical reservoir models that take into account the dispersion in both radiogenic isotope ratios and parent/daughter ratios in the mantle to obtain a simple theory that can combine fluxes and residence time estimates from traditional geochemical reservoir models with mixing times from three dimensional mantle convection models. Test results for the Nd and Sr isotopic systems demonstrate the validity of this approach. It is also proposed to combine reservoir models for isotopic transport and evolution with a parameterized convection model that will integrate the chemical evolution with thermal evolution. The parameterized models will include important effects that have only recently been identified, such as the bending of the lithosphere.

雅各布森0112563，研究人员将在几个密切相关的主题上工作，这些主题将解决与地幔的结构以及化学和动力学演化有关的重要问题。这项工作将需要结合使用地球化学库模型的方法，该模型考虑到地幔中放射性同位素比率和母子比率的分散，以获得一个简单的理论，该理论可以将传统地球化学库模型中估计的通量和停留时间与三维地幔对流模型中的混合时间结合起来。对钕和锶同位素体系的测试结果证明了该方法的有效性。提出了将同位素运移演化的储集层模型与将化学演化与热演化相结合的参数化对流模型相结合的方法。参数化模型将包括最近才确定的重要影响，如岩石圈的弯曲。