Absolute Dating of Limestone Scarps Created by Paleoearthquakes Using Cosmogenic Carbon-14

使用宇宙成因碳 14 对古地震形成的石灰岩悬崖进行绝对年代测定

• 批准号: 9204835
• 负责人: Thure Cerling
• 金额: $ 17.55万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-15 至 1995-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204835&HistoricalAwards=false
• 关键词: Absolute; Dating; Limestone; Scarps; Created

This research is to develop a technique to date movements on faults by analysis of the distribution of cosmic-ray-flux- generated carbon-14 in calcite on exposed limestone fault scarps. The initial area of investigation will be in Pleasant Valley, Nevada, and in the Oquirrh-Stansbury Ranges, Utah. Carbon-14 production will be calibrated on surfaces of known age such as Bonneville and Provo Shoreline features which have previously been used to calibrate in situ produced cosmogenic isotopes. Future studies could be extended to use other minerals which will greatly extend the method's usefulness. The goal is to extend the record of earthquake occurrence on exposed faults into pre- historical times. This research is a component of the National Earthquake Hazard Reduction Program.

本研究旨在开发一种技术，通过分析暴露的石灰岩断层悬崖上方解石中宇宙射线通量产生的碳 14 的分布来确定断层运动的年代。 最初的调查区域将位于内华达州的普莱森特谷和犹他州的奥奎尔-斯坦斯伯里山脉。 碳 14 的产生将在已知年龄的表面上进行校准，例如博纳维尔和普罗沃海岸线特征，这些特征此前曾用于校准原位产生的宇宙同位素。 未来的研究可以扩展到使用其他矿物质，这将大大扩展该方法的实用性。 目标是将裸露断层上的地震发生记录延伸到史前时期。 这项研究是国家地震减灾计划的一部分。