Luminescence dating of glacial and associated sediments: review, recommendations and future directions
Luminescence dating of glacial and associated sediments: review, recommendations and future directions
复制标题
DOI：
10.1111/j.1502-3885.2008.00052.x
复制
发表时间：
2008-11
期刊：
影响因子：
2.2
通讯作者：
M. Fuchs;L. Owen
中科院分区：
文献类型：
--
作者：
M. Fuchs;L. Owen
冰川和相关沉积物的年代测定对于准确重建过去的气候条件和帮助确定冰川的性质和规模以进行景观演化研究至关重要。对于第四纪地貌和沉积物的年代测定，几乎没有广泛适用、准确和精确的方法可用，尽管目前有许多可用的数字测年方法。此外，几乎没有方法可以用于整个晚第四纪(大约125 KYR前到现在)。然而，发光测年的最新进展提供了测定各种晚第四纪冰川和相关地貌沉积物的时间的机会。应用发光法需要了解冰川和相关环境的性质，以选择最合适的沉积物样品进行测年。与冰川沉积物发光测年相关的问题包括漂白不足、石英的灵敏度低，以及沉积物历史期间由于水含量变化或核素淋失而导致的剂量率不同。这些问题可以通过仔细采样和描述采样地点、测试漂白不足和建立剂量率变异性模型来克服。
Dating glacial and associated sediments is essential to provide a temporal framework for accurate reconstructions of past climatic conditions and for helping to determine the nature and magnitude of glaciation for landscape evolution studies. There are few widely applicable, accurate and precise methods available to date Quaternary landforms and sediments, despite the numerous numerical dating methods that are currently available. Furthermore, there are few methods that can be utilized for the whole of the late Quaternary (c. 125 kyr ago to present). Recent developments in luminescence dating, however, are providing opportunities to date a broad range of late Quaternary glacial and associated landform sediments. The application of luminescence methods requires an understanding of the nature of glacial and associated environments to select the most appropriate sediment samples for dating. Problems associated with luminescence dating of glacial sediments include insufficient bleaching, low sensitivity of quartz, and variable dose rates during the history of the sediment due to changing water content or nuclide leaching. These problems can be overcome by careful sampling and descriptions of the sampling site, testing for insufficient bleaching and modelling dose rate variability.