评估板块重建模型使用板块驱动力一致性测试
Edward J Clennett1,2, Adam F Holt3, Michael G Tetley4
1Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, Austin, USA. edward.clennett@utexas.edu.
Scientific reports
|June 23, 2023
概括
本研究引入了一种新的算法,通过计算驱动力来评估板块重建模型中的地力学可信性. 它揭示了过去的重建中的显著残余扭矩,突出了模型改进的领域.
科学领域:
- 地质物理学 地质物理学
- 板块构造学是一种板块构造学.
- 地力学是什么?地力学是什么?
背景情况:
- 板块重建模型通常使用地质和地物理数据,但往往忽视物理板块驱动力.
- 这种遗漏可能导致地力学上不可思议的重建,对地球科学研究产生重大影响.
研究的目的:
- 开发和介绍一种新的算法,用于计算时间依赖的板块驱动力 (板块拉动,脊推,地幔拖动).
- 评估板块重建中的残余扭矩,并识别潜在的地力学不合理性或知识差距.
主要方法:
- 该算法计算了时间依赖的板拉力,推力 (重力潜在能量力) 和地幔阻力.
- 它评估了平衡板运动所需的剩余扭矩,基于拓上封闭的重建所假定的驱动力关系.
主要成果:
- 对于今天的重建来说,残余扭矩是最小的,但在900万年前到5000万年前的模型中可能是相当大的 (与驱动扭矩相同的数量级).
- 对太平洋板块的分析表明,该算法在确定时间段和具有高残余扭矩的区域方面具有实用性.
结论:
- 该算法作为一个工具来评估和增强使用动态约束的板块重建模型.
- 已识别的残余扭矩表明了潜在的地力学不合理性,或突出了在特定地质时间中像地幔流动这样未被建模的力量的重要性.
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