Thermoluminescence dating of late Devensian loesses in southern England
Thermoluminescence dating of late Devensian loesses in southern England
复制标题
英格兰南部德文世晚期黄土的热释光测年
作者：
A. Wintle
散布在英格兰南部的是许多孤立的黄土状物质沉积物。少数，如在肯特佩格韦尔湾，是高度钙质和未风化的，但大多数已被改造的河流或崩积过程。在肯特也有一些前德文斯黄土的地层学证据，但到目前为止，对近代黄土的测年一直是基于间接证据。Pegwell湾黄土是英国最广泛的真正风成黄土存款，因此人们对它做了大量的研究。Kerney 2将Thanet岛和Pegwell湾的晚期Devensian沉积物与荷兰和比利时的类似沉积物进行了比较，在荷兰和比利时，放射性碳测年法已经获得了沉积物的年代。东肯特沉积物与北方沉积物的对比表明，肯特的黄土形成于30，000至14，000年前。我在这里报告的是英国南部从锡利群岛（Scilly Isles）到肯特（Kent）的六个较近期沉积物的年代。使用最近开发的热释光（TL）测年技术3，4，在黄土本身上获得了这些日期，并确认其年龄为晚德文斯期。
Scattered across southern England are many isolated deposits of loess-like material1. A few, such as that at Pegwell Bay in Kent, are highly calcareous and unweathered but most have been reworked by fluvial or colluvial processes. There is good stratigraphical evidence for a few pre-Devensian loesses, also in Kent, but dating of more recent loess has so far been based on indirect evidence. Much work has been done on the Pegwell Bay loess as it is the most extensive, truly aeolian loessic deposit in Britain. Kerney2 compared the late Devensian deposits in the Isle of Thanet and at Pegwell Bay with similar deposits in Holland and Belgium where radiocarbon dates have been obtained for interstadial deposits. Correlation of the East Kent deposits with these in Northern Europe indicates that the loesses in Kent were formed between 30,000 and 14,000 yr ago. I report here dates for six of the more recent deposits in southern Britain from the Scilly Isles to Kent. The dates have been obtained on the loess itself, using a recently developed thermoluminescence (TL) dating technique3,4, and confirm the ages as being late Devensian.