Reconstruction of Thrust-Wedge Taper in the Wyoming-Utah Sevier Thrust Belt

9316700 DeCelle临界楔体模型提供了褶皱冲断带和增生楔体的总体几何形状的有用概括，以及对其内部运动学发展和流变性的具体预测。然而，临界楔体模型与地质实例的比较仅限于对现代增生楔体和褶皱冲断带的静态分析，在古前陆褶皱冲断带中只取得了部分成功。目前的模型在四个方面仍未得到检验：随时间推移的楔形，内部楔形结构，侵蚀和前陆盆地沉降的影响，以及材料性质与离散的内部结构(如前陆-年轻褶皱-逆冲)之间的联系。该项目将重点研究著名的怀俄明州-犹他州塞维尔冲断带3600万年来腹地基底隆起和前陆薄皮推覆滑移的楔形和内部逆冲几何的定量增量逆变形，以解决这些问题。预计结果将检验临界楔形理论的几个重要关联，并有助于解决有关该逆冲带断层之间的几何和运动学关系的区域性问题。

9316700 DeCelles Critical-wedge models provide useful generalization of the gross geometry of fold-thrust belts and accretionary wedges, as well as specific predictions for their internal kinematic development and rheologic behavior. However, comparison of critical-wedge models to geologic examples has been limited to static analysis of modern accretionary wedges and fold-thrust belts and with only partial success in ancient foreland fold-thrust belts. Present models remain largely untested in four area: wedge shape through time, internal wedge structure, effect of erosion and foreland basin subsidence, and link between material properties and the discrete internal structures such as foreland-younging fold-thrusts. This project will address these issues by focusing on quantitative incremental retrodeformation of wedge shape and internal thrust geometry for a 36 million year period of hinterland basement uplift and foreland thin-skinned thrust slip in the well-known Wyoming-Utah Sevier Thrust Belt. Results are expected to test several important correlaries of the critical-wedge theory, as well as help resolve regional questions concerning the geometric and kinematic relationships between faults in this thrust belt.