A Geologic Redetermination of the Uranium Decay Constants, and Implications for Concordia Intercept Ages and High-Precision 207Pb/206Pb Ages

铀衰变常数的地质重新确定以及对 Concordia 截距年龄和高精度 207Pb/206Pb 年龄的影响

• 批准号: 9418560
• 负责人: James Mattinson
• 金额: --
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-02-01 至 1998-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9418560&HistoricalAwards=false
• 关键词: Geologic; Redetermination; Uranium; Decay; Constants

9418560 Mattinson The objective of the proposed research is a significant refinement of the decay constants that are crucial to all U- Pb geochronology. The proposed research will have a geologic approach, which has two important advantages. First, errors in the present decay constants and in the thrid relevant constant, the isotopic composition of natural U, can be evaluated together, as a single source of error. Secondly, uncertainties in corrections for disequilibrium effects in the U decay chains (230-Th and 231-Pa) can also be evaluated. A wide range of U-Pb studies will benefit from the proposed work, especially calibration of the geologic timescale, and studies where comparisons or correlations are made with ages obtained by other high- precision geochronology methods, such as 40-Ar/39-Ar.

9418560 Mattinson 拟议研究的目标是对对所有 U-Pb 地质年代学至关重要的衰变常数进行重大改进。拟议的研究将采用地质方法，它有两个重要的优点。首先，当前衰变常数和第三个相关常数（天然U的同位素组成）中的误差可以作为单一误差源一起评估。其次，还可以评估 U 衰变链（230-Th 和 231-Pa）中不平衡效应校正的不确定性。广泛的 U-Pb 研究将受益于所提出的工作，特别是地质时间尺度的校准，以及与其他高精度地质年代学方法（例如 40-Ar/39-Ar）获得的年龄进行比较或相关的研究。