前陆盆地挠曲沉降和沉积过程3D模型研究

前陆盆地是在造山带负荷作用下岩石圈发生挠曲沉降而形成的,并且被主要从造山带搬运的沉积物所充填。为了更好地理解和认识前陆盆地的形成演化机制,特别是受控于周缘多个造山带活动所形成的前陆盆地的演化机制,本文通过建立前陆盆地挠曲沉降与沉积过程的3-D模型,模拟展示了造山带逆冲推覆作用、岩石圈挠曲沉降响应及在山盆体系中由于动力地形变化而导致的河流体系的发育变化及其产生的剥蚀和沉积过程。模型的建立和实验完整体现了逆冲推覆、弹性挠曲沉降和沉积物搬运这三者之间的耦合机制,为全面深入研究前陆盆地动力学提供了理论依据和方法。

3-D flexural and stratigraphic model for foreland basin

Abstract: Foreland basins form by lithospheric flexure under orogenic loading and are filled by surface transport of sediment. In order better to understand the mechanism of the evolution of foreland basin which is subjected to various loads applied at its literal boundaries, we carried out a three dimensional flexural and sedimentary model after study of the mathematical geology process of foreland basin, and test an synthetic model, which shows a perfect result of the thrusting process and the pattern of foreland basin in response of the lithospheric flexural subsidence, and then we model the erosion and sediment which is the result of the drainage system on the basis of the dynamic topography. The modelling also indicates the interplay and limitation between the thrust stacking, elastic flexural subsidence and sediment transport. The 3-D model brings us not only a theoretical basement but also a useful tool for the deep study of foreland basin.