Geodynamic modelling of the initiation of plate tectonics in a differentiating early Earth.

分化的早期地球中板块构造起始的地球动力学模型。

• 批准号: 277080870
• 负责人: Professor Dr. Boris J.P. Kaus
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/277080870?language=en
• 关键词: Geodynamic; modelling; initiation; plate; tectonics

Whereas there has been considerable progress over the last few decades in understanding the physical mechanisms that resulted in the generation of self-consistent plate tectonics on Earth, existing models remain unrealistic as they only operate successfully for yield stresses that are smaller than experimentally constrained values. Moreover, existing models typically don't take partial melting and differentiation into account. Here we will perform state-of-the-art 2D and 3D geodynamic models in order to understand the effect of magmatic differentiation and crust formation on the lithospheric deformation styles that occurred on a warmer early Earth. Our models incorporate realistic visco-elasto-plastic rheologies for the lithosphere, shear heating, a free surface, and thermodynamically constrained densities for the main rock-types that developed. Systematic simulations will help to understand the physics of the models as well as the sensitivity of the model results to uncertainties in the input parameters. Testable predictions will be derived from the geodynamic models that can be compared with geological and petrological constraints.

虽然在过去的几十年里，在理解导致地球上自洽板块构造产生的物理机制方面取得了相当大的进展，但现有的模型仍然是不现实的，因为它们只在屈服应力小于实验约束值的情况下才能成功运行。此外，现有的模型通常不考虑部分熔化和分化。在这里，我们将执行国家的最先进的2D和3D地球动力学模型，以了解岩浆分异和地壳形成的岩石圈变形的风格，发生在一个温暖的早期地球上的影响。我们的模型将现实的粘弹塑性流变学的岩石圈，剪切加热，一个自由表面，并为主要的岩石类型，开发的热塑性约束密度。系统模拟将有助于理解模型的物理特性以及模型结果对输入参数不确定性的敏感性。可测试的预测将来自地球动力学模型，可以与地质和岩石学的限制。