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首页> 外文期刊>Quaternary geochronology >Comparing the accuracy and precision of luminescence ages for partially-bleached sediments using single grains of K-feldspar and quartz
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Comparing the accuracy and precision of luminescence ages for partially-bleached sediments using single grains of K-feldspar and quartz

机译：使用k-feldspar和石英粒子的粒子漂白沉积物的精度和精度比较了发光年龄的精度和精度

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Glacial settings are considered to be the most challenging context for the application of luminescence dating. The optically stimulated luminescence (OSL) signal of quartz is often preferred for luminescence dating in partially bleached settings as it resets (or bleaches) more rapidly in response to sunlight than the post-IR IRSL (pIRIR) signal of K-feldspar, and can therefore better characterise the well-bleached part of the partially-bleached De distribution. However, the relative bleaching extents of single grains of quartz and K-feldspar have not yet been compared for sedimentary samples from the natural environment. Here we compare the D, distributions and accuracy and precision of ages determined using single grains of quartz and K-feldspar from sedimentary samples deposited in a proglacial setting with independent age control. We found that the extent of bleaching of the OSL signal of quartz and pIRIR(225) signal of K-feldspar was similar (with similar over-dispersion), and therefore the pIRIR(225) signal bleached to similarly low levels as the OSL signal of quartz in this partially-bleached setting. We also observed a consistent offset in over-dispersion between quartz and K-feldspar of 10% that can be linked to scatter arising from internal dose-rates of K-feldspar and should be included when applying age models. The results here demonstrate that the accuracy and precision of ages determined using the pIRIR(225) signal of single grains of K-feldspar were similar to the OSL signal of quartz. However, K-feldspars were 5-18 times more efficient than quartz at determining the population of interest for age calculation as a larger proportion of K feldspar grains emitted a detectable luminescence signal in comparison to quartz. These findings contradict our current understanding of the bleaching of K-feldspar and quartz grains in the natural environment, and are likely applicable to other partially-bleached settings (e.g. fluvial, alluvial).
机译：冰川设置被认为是应用发光约会的最具挑战性的背景。石英的光学刺激的发光（OSL）信号通常优选在响应于阳光的阳光下重置（或漂白）而不是K-Feldspar的后IRSL（Pirir）信号，并且可以因此，更好地表征部分漂白的部分漂白部分分布。然而，对于来自自然环境的沉积样品，尚未比较石英和K-FeldSpar的单粒粒子的相对漂白区。在这里，我们比较使用沉积在具有独立年龄控制的ProGlacial设置中的沉积样品中的石英和K-Feldspar测定的D，分布和准确度和精度。我们发现，k-feldspar的石英和Pirir（225）信号的漂白程度相似（具有相似的过分分散），因此吡尔（225）信号漂白为与OSL信号类似的低水平在这种部分漂白的环境中的石英。我们还观察到在石英和K-Feldspar之间的过分分散中的一致偏移量10％可以与K-FeldSpar的内部剂量率引起的散射相连，并且应该在应用年龄模型时包括。这里的结果表明，使用k-feldspar的单粒子的Pirir（225）信号测定的年龄的准确性和精度与石英的OSL信号类似。然而，K-FeldSpars在测定年龄计算的利息群时，k-feldspars比石英为5-18倍，因为与石英相比，较大比例的k长石晶粒被发射可检测的发光信号。这些调查结果与我们目前的了解自然环境中K-Feldspar和石英粒的漂白，并且可能适用于其他部分漂白的环境（例如氟，冲积）。

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