COLLABORATIVE RESEARCH: Forward and Inverse Modeling of Two Cretaceous Foreland Basins: A Cooperative Research Program

合作研究：两个白垩纪前陆盆地的正向和反演模拟：合作研究计划

• 批准号: 9019633
• 负责人: Peter Flemings
• 金额: --
• 依托单位: Columbia University Lamont Doherty Earth Observatory
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-03-01 至 1992-02-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9019633&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Forward; Inverse; Modeling

A recently developed quantitative model predicts the stratigraphy and geometry of foreland basins and passive margin basins in response to deformation history and sea-level change. The model combines a largely-accepted mechanical description of the lithosphere with a new approach, that of simulation of the surface transport of sediments by diffusion. The robustness of the new approach will be tested by comparing the predicted stratigraphies of two foreland basins, the colville basin and the Western Interior Seaway, to the geological data. Sediment fluxes and depositional profiles will be measured over known time intervals and the lithospheric loads calculated by two-dimensional back-stripping procedures. The load histories and sediment fluxes will then be input to the forward model of basin evolution. The project is a collaboration of scientists from Cornell University, Lamont-Doherty Geological Observatory, and the University of Colorado. The results will resolve whether or not the lithosphere relaxes significantly during foreland basin formation, the tectonic effects of thrusting on subsidence in the distal parts of basins, and the contribution of eustatic sea-level change to stratigraphic sequences. These findings will have important consequences for tectonics and sedimentology.

最近发展的定量模型预测地层和几何的前陆盆地和被动边缘盆地的变形历史和海平面变化。该模型结合了广泛接受的岩石圈的力学描述与一种新的方法，即模拟沉积物扩散的表面输运。新方法的鲁棒性将通过比较两个前陆盆地，科尔维尔盆地和西部内陆海道，地质数据的预测地层进行测试。将在已知的时间间隔内测量沉积通量和沉积剖面，并通过二维回剥程序计算岩石圈负荷。负荷历史和沉积物通量，然后将输入到盆地演变的正演模型。该项目是来自康奈尔大学、拉蒙特-多尔蒂地质观测站和科罗拉多大学的科学家们的合作。其结果将解决前陆盆地形成过程中岩石圈是否发生明显的松弛、逆冲推覆作用对盆地远缘沉降的影响以及海平面变化对地层层序的贡献等问题。这些发现将对构造学和沉积学产生重要影响。