Evaluating the contribution of plate boundary forces and mantle flow on the late Cenozoic North American plate motion history with coupled global models of mantle and lithosphere dynamics

利用地幔和岩石圈动力学耦合全球模型评估板块边界力和地幔流对晚新生代北美板块运动历史的贡献

• 批准号: 437134941
• 负责人: Dr. Ingo Leonardo Stotz, Ph.D.
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/437134941?language=en
• 关键词: Evaluating; contribution; plate; boundary; forces

Plate motion changes hold powerful constraints on the driving and resisting forces of tectonic plates. Here I propose to use global coupled models of the mantle and lithosphere dynamics, capable of representing plate boundary as well as mantle convection related forces, to exploit the fact that the Neogene velocity of North America relative to Nubia and Eurasia has beenmapped recently at high temporal resolution, revealing two abrupt slowdowns at 15 Ma and 7 Ma, respectively. I will combine this information with geologic indicators on the Cenozoic uplift history of western North America. The data-driven modeling approach will allow me to test whether forcing from ridge push and large scale mantle flow is sufficient to explain theNorth American plate motion change, or whether the Neogene arrival of the Yellowstone hotspot may have contributed to it, by imparting substantial sublithospheric stresses through pressure-driven (i.e., Poiseuille) upper mantle flow. The proposed work builds on earlier experience indicating that the sub-Pacific asthenosphere features a significant component of Poiseuille flow, and offers the exciting possibility to explain the North American plate motion change quantitatively through geodynamic modeling, thus helping to elucidate the force balance of a major tectonic plate.

板块运动的变化对构造板块的驱动力和抵抗力具有强有力的制约作用。在这里，我建议使用全球地幔和岩石圈动力学耦合模型，能够代表板块边界以及地幔对流相关的力量，利用的事实，新近纪北美相对于努比亚和欧亚大陆的速度已被映射在最近在高时间分辨率，揭示两个突然减速在15 Ma和7 Ma，分别。我将联合收割机把这些信息与北美西部新生代隆起历史的地质指标结合起来。数据驱动的建模方法将使我能够测试来自山脊推压和大规模地幔流的作用力是否足以解释北美板块运动的变化，或者黄石热点的新第三纪到来是否可能促成了这一变化，通过压力驱动（即，上地幔流动。这项工作建立在早期经验的基础上，表明亚太平洋软流层具有重要的组成部分，Poienville流，并提供了令人兴奋的可能性，通过地球动力学模拟定量解释北美板块运动的变化，从而有助于阐明一个主要的构造板块的力平衡。