Timing of Incision of the Salmon River, West-Central Idaho, Using (U-Th)/He Analysis of Apatites

使用 (U-Th)/He 磷灰石分析确定爱达荷州中西部鲑鱼河的切割时间

• 批准号: 9909453
• 负责人: Brian Wernicke
• 金额: $ 7.36万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-01-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909453&HistoricalAwards=false
• 关键词: Timing; Incision; Salmon; River; West

9909453WernickeThe upward motion of rock masses relative to the earth's surface has been documented for most major mountain belts, but because of compensating erosion, it is difficult to determine if significant topographic elevation developed and when in the tectonic cycle it occurred. This project will utilize a relatively new method for estimating the age of topographic uplift in the Salmon River-Clearwater Mountains of Idaho, an area analogous to the Sierra Nevada further south in the cordillera, where paleoelevation has been shown to start during the Cretaceous. Results will help determine the spatial pattern of elevation development in the Cordillera and will provide a further test or validation of the method.

[9094553]对于大多数主要的山带来说，岩体相对于地球表面的向上运动已经被记录下来，但是由于补偿性的侵蚀作用，很难确定是否形成了显著的地形高程，以及它是在构造旋回的什么时候发生的。该项目将利用一种相对较新的方法来估算爱达荷州萨蒙河-清水山脉的地形隆起年龄，该地区类似于科迪勒拉山脉更南的内华达山脉，那里的古海拔已被证明始于白垩纪。结果将有助于确定科迪勒拉地区海拔发展的空间格局，并将为该方法提供进一步的测试或验证。