Nature and timing of long-term landscape evolution by optical dating of single grains of sand

我们正在申请资金，用于购买Risø双激光单颗粒光激发发光(OSL)装置以及配套的硬件和软件，该装置旨在直接安装到My(Lian)现有的Risø型号TL/OSL-DA-20测年系统上。此次升级将使现有系统现代化，大大增加其实用性，并将其寿命再延长十年；它还将允许无缝添加制造商提供的其他组件。双激光单颗粒OSL附件将使我们能够在单颗粒(光学测年中最小的基本分析单位)水平上仔细观察来自石英和钾长石沉积物样品的发光信号，这反过来将使我们能够显著提高根据它们确定的光学年龄的精确度和准确度。这是通过识别和分离具有不同年龄人口的样品中的颗粒(石英和钾长石)，通过检测和避免具有可能对计算年龄产生负面影响的具有恶意发光特性的颗粒(石英)，或者通过识别并仅包括那些具有能够计算出更老年龄的发光特性的颗粒(所谓的“超级颗粒”)来实现的。单颗粒分析将使我们能够更好地理解，或许更有效地绕过钾长石和其他长石矿物中异常褪色的不良影响。

We are requesting funding for the purchase of a Risø dual-laser single-grain optically-stimulated luminescence (OSL) unit, and supporting hardware and software, that is designed to fit directly onto my (Lian’s) existing Risø model TL/OSL-DA-20 dating system. The upgrade will modernize the existing system, significantly increase its usefulness, and extend its life for another decade; it will also allow for the seamless addition of other components available from the manufacturer. The dual-laser single-grain OSL attachment will allow us to scrutinize the luminescence signals from quartz and K-feldspar sediment samples at the single grain level (the smallest fundamental unit of analysis in optical dating) which will, in turn, allow us to significantly increase the precision and accuracy of optical ages determined from them. This is accomplished by identifying and separating grains (quartz and K-feldspar) in a sample with different age populations, and by detecting and avoiding grains (quartz) with malign luminescence properties that can negatively effect calculated ages, or by identifying and including only those grains with luminescence properties that allow for much older ages to be calculated (so-called ‘super grains’). Single grain analysis will allow us to better understand, and perhaps more effectively circumvent, the malign effect of anomalous fading in K-feldspar and other feldspar minerals.