The Use of Deformation Profiles and Strain Histories in Drawing Balanced Restorable Sections and Evaluating Kine- matic in an Internal Thrust Sheet

平衡剖面是了解褶皱冲断带发展的有力工具，通常应用于内部应变较小的外部逆冲断层。然而，绘制可行的和允许的内部推力片横截面需要额外的关于推力片内应变的信息，应变是如何分布的，以及在变形期间应变何时累积。通过使用应变历史研究来分离连续的有限变形增量，可以在恢复序列中的适当时间移除适当的应变增量。然而，获取所需应变数据的实用方法尚未完善或测试。该项目将从爱达荷州-怀俄明州-犹他州冲断带著名的米德冲断片中广泛存在的标志物中收集应变数据。该项目开发的方法有望帮助将横断面平衡技术推广到内陆地区。

Balanced cross-sections are a powerful tool for under- standing the development of a fold-and-thrust belt, and have commonly been applied to external thrusts where internal strain is small. However, the drawing of viable and admissible cross- sections for internal thrust sheets requires additional informa- tion on strain within the thrust sheet, how the strain was dis- tributed and when during the deformation the strain accumulated. By using strain history studies to separate successive finite increments of deformation, appropriate strain increments can be removed at proper times in the restoration sequence. However, a practical method for obtaining the required strain data has not been perfected or tested. This project will collect strain data from widespread markers in the well-known Meade thrust sheet of the Idaho-Wyoming-Utah thrust belt. The methods developed in this project are expected to help extend the technique of cross- section balancing to hinterland terrains.