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

使用变形轮廓和应变历史绘制平衡可恢复截面并评估内部推力片的运动学

• 批准号: 8916629
• 负责人: Gautam Mitra
• 金额: $ 7.5万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-02-01 至 1993-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8916629&HistoricalAwards=false
• 关键词: Use; Deformation; Profiles; Strain; Histories

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.

平衡截面是理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冲断。然而，绘制可行的和允许的内部推力片截面需要额外的信息，包括推力片内部的应变，应变是如何分布的，以及在变形过程中应变是在什么时候积累的。通过对应变历史的研究，分离出连续的有限变形增量，从而在恢复序列的适当时间移除适当的应变增量。然而，获得所需应变数据的实用方法尚未得到完善或测试。该项目将从爱达荷-怀俄明-犹他州冲断带著名的米德冲断带上的广泛标记物中收集应变数据。该项目开发的方法有望帮助将截面平衡技术扩展到腹地地形。