CSEDI: Geochemical and Geodynamical Studies of Earth Evolution

研究人员将研究几个密切相关的课题，这些课题将解决与地幔的结构、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储层模型的方法，考虑到放射性成因同位素比率和地幔中父/子比率的分散，以获得一个简单的理论，可以将传统地球化学储层模型的通量和停留时间估计与三维地幔对流模型的混合时间结合起来。Nd和Sr同位素体系的测试结果证明了该方法的有效性。并提出将同位素输运演化的储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。参数化模型将包括最近才被发现的重要影响，如岩石圈的弯曲。

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.