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Two-dimensional chronostratigraphic modelling of OSL ages from recent beach-ridge deposits, SE Australia

机译：澳大利亚最近的海滩山脊仓库欧元龄的二维计时数据建模

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摘要

Optically-stimulated luminesecne (OSL) dating, in concert with two-dimensional ground-penetrating radar (GPR) profiling, has contributed to significant advances in our understanding of beach-ridge systems and other sedimentary landforms in various settings. For recent beach-ridges, the good OSL properties of coastal quartz permit a high sample throughput thanks to shorter measurement times and simpler sample preparation prompting the collection of more samples at higher sampling resolution. However, sampling at high resolution increases the chance of age inversions because random errors between samples may be larger than the difference in sample ages. Age inversions can be avoided, however, if the stratigraphic constraints are included in the age estimation process. Here, we create a custom Bayesian chronological model for a recent ( 500 yr) beach-ridge sequence in Moruya, southeast Australia, for direct comparison with a GPR profile. The model includes a full 'burial-dose model' for each sample and a dose rate term with the modelled ages constrained by the vertical and shore-normal sample order. The modelled ages are visualized by plotting isochrones on the beach-ridge cross section, and validated against a beach monitoring dataset. The modelling approach allows a more detailed interpretation of the Moruya beach-ridge system; when combined with higher-resolution sampling, the approach will increase the precision of beach-ridge chronologies and provide further insights into their formative processes.
机译：光学刺激的LumineseCNE（OSL）约会，与二维地面穿透雷达（GPR）分析的音乐会进行了作用，这有助于我们在各种环境中了解海滩岭系统和其他沉积地貌的显着进展。对于最近的海滩脊，沿海Quartz的良好OSL属性允许高样本吞吐量，相应较短的测量时间和更简单的样品准备在更高的采样分辨率下提示更多样品的采样。然而，高分辨率的抽样增加了年龄逆转的机会，因为样品之间的随机误差可能大于样本年龄的差异。然而，如果地层限制包括在年龄估计过程中，则可以避免年龄逆转。在这里，我们为澳大利亚州东南部的Moruya的最近（＆lt）的海滩山脊序列创建了自定义贝叶斯时间模型，与GPR概况直接比较。该模型包括每个样品的全部“埋葬剂型”，并且剂量率术语具有由垂直和跳线正常样品顺序约束的模型年龄。模型年龄通过绘制海滩脊横截面上的等色来可视化，并对海滩监控数据集进行验证。建模方法允许更详细地解释Moruya Beach-Ridge系统;当与更高分辨率的采样结合时，该方法将增加海滩岭时间的精度，并在其形成过程中提供进一步的见解。

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