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

[9418560] Mattinson提出的研究目标是对所有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，这有两个重要的优势。首先，当前衰变常数和第三个相关常数（天然铀的同位素组成）的误差可以作为一个单一的误差源一起评估。其次，还可以评估U衰变链（230-Th和231-Pa）中不平衡效应修正的不确定性。广泛的U-Pb研究将受益于拟议的工作，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（如40-Ar/39-Ar）获得的年龄进行比较或相关性的研究。

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.