前陆盆地挠曲沉降和沉积过程3-D模型研究  

3-D Modeling for Flexural Subsidence and Deposition Process of Foreland Basin

作　　者：胡明卿[1,2,3] 刘少峰[2,3] 

机构地区：[1]中石油煤层气有限责任公司,北京100011 [2]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [3]中国地质大学地球科学与资源学院,北京100083

出　　处：《地质学报》2012年第1期181-187,共7页Acta Geologica Sinica

基　　金：国家自然科学基金重点项目(41030318);高等学校学科创新引智计划项目(B07011);中国石油化工股份有限公司前瞻性研究项目;长江学者和创新团队发展计划项目(IRT0864)资助的成果

摘　　要：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。Foreland basins are formed both by flexural subsidence of litholosphere under the effect of orogenic loading and by sediments transported from orogens. In order to better understand the mechanism and evolution of foreland basins, especially development of foreland basins controlled by several orogens distributed around the basins, this study established a 3-D model for flexural subsidence and sedimentary process and simulated the thrusting process of orogenic belt, response to flexural subsidence of lithosphere, and the erosion and deposition of foreland basin driven by drainage systems on the dynamic landform of the mountain-basin system, displaying the interplay and coupling mechanism among thrust stacking, elastic flexural subsidence and sediment transport. Therefore, the 3-D modelling provides both powerful theoretical basis and useful tool for deep study of foreland basins.

关 键 词：前陆盆地 弹性挠曲沉降 沉积过程 3-D模拟 

分 类 号：P512.2[天文地球—地质学]