Cosmogenic Nuclides Applied to Fault-Scarp Dating

宇宙成因核素应用于断层陡坡测年

• 批准号: 9980535
• 负责人: Fred Phillips
• 金额: $ 15万
• 依托单位: New Mexico Institute of Mining and 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 2003-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9980535&HistoricalAwards=false
• 关键词: Cosmogenic; Nuclides; Applied; Fault; Scarp

9980535PhillipsTiming of geologically recent faults is crucial to many neotectonic and environmental projects, but is difficult to determine if the fault movements occurred prior to recorded history. Faults that break the surface commonly leave a scarp due to differential vertical movements. Crudely, young fault scarps are steep and have sharp edges, whereas older ones have been eroded so that they are less steep and smoothed. Attempts to use this relationship more quantitatively estimate a scarp "diffusivity" to calibrate the age vs. fault scarp geomorphology relationship. However, this and other techniques have large errors which negatively impacts the ages of fault movement obtained. This project will attempt to use cosmogenic chlorine-36 accumulation around several faults of known age to refine estimation of fault scarp diffusivity. Results should help reduce errors in using fault scarp morphology and lower the costs of accurately estimating the age of fault movements.

9980535Phillips 地质上近期断层的时间对许多新构造和环境项目至关重要，但很难确定断层运动是否发生在有记录的历史之前。 由于垂直运动差异，破坏地表的断层通常会留下陡坡。 粗略地看，年轻的断层陡坡很陡峭，边缘锋利，而较老的断层陡坡已被侵蚀，因此不再那么陡峭且平滑。 尝试使用这种关系更定量地估计陡坡“扩散率”，以校准年龄与断层陡坡地貌关系。 然而，这种技术和其他技术具有很大的误差，这会对获得的断层运动年龄产生负面影响。 该项目将尝试利用已知年龄的几个断层周围宇宙成因氯 36 的积累来完善对断层陡坎扩散率的估计。 结果应有助于减少使用断层陡坎形态时的错误，并降低准确估计断层运动年龄的成本。