COLLABORATIVE RESEARCH: Mechanics of Footwall Uplift DuringDetachment Faulting: A Field Test of Kinematic and Dynamic Models

合作研究：拆离断层期间下盘隆起的力学：运动学和动力学模型的现场测试

• 批准号: 9219472
• 负责人: Jane Selverstone
• 金额: $ 6.75万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-01 至 1995-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9219472&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Mechanics; Footwall; Uplift

Isostatic uplift of denuded footwall rocks beneath a shallowly-dipping detachment fault is thought to cause upwards arching of the detachment and may cause the shallow past of the fault to be abandoned. This theory predicts that as fault slip continues, the hinge zone between steep, active and shallow, inactive parts of the fault will migrate through the footwall. Alternative models predict different strain paths will be recorded in the footwall rocks. This study will test the hypothesis of a migrating hinge zone by examining the strain state in footwall rocks beneath three detachment faults from different tectonic settings: Beaver Dam Mountains, Utah; Whipple Mountains, California; and Brenner Line, eastern Alps. The results will allow assessment of the migrating hinge models and will have broad applicability to extensional zones in a variety of tectonic environments.

人们认为，浅倾滑脱断层下方的裸露下盘岩石的等静压抬升会导致滑脱向上拱起，并可能导致断层浅层过去被废弃。 该理论预测，随着断层滑动的继续，断层陡峭的活动部分和浅层非活动部分之间的铰接带将迁移穿过下盘。 替代模型预测下盘岩石中将记录不同的应变路径。 这项研究将通过检查来自不同构造环境的三个滑脱断层下下盘岩石的应变状态来检验迁移铰链区的假设：犹他州比弗水坝山脉；加利福尼亚州惠普尔山；和布伦纳线，东阿尔卑斯山。 结果将允许评估迁移铰链模型，并将广泛适用于各种构造环境中的伸展带。