Chronology of late wisconsinan glaciation in middle North America
Chronology of late wisconsinan glaciation in middle North America
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DOI：
10.1016/0277-3791(82)90019-1
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发表时间：
1982
影响因子：
4
通讯作者：
L. Clayton;S. Moran
中科院分区：
文献类型：
--
作者：
L. Clayton;S. Moran
我们提出了一个年代学晚威斯康星冰川波动在北美中部，从阿尔伯塔到威斯康星州，仅来自木材的放射性碳年代。以前的北美大陆冰盖西南缘的年代学在很大程度上依赖于细粒有机沉积物的放射性碳年代。这种材料通常被较老的碳污染，导致年代混乱。通过只使用来自木材的日期，许多混乱消失了。然而，由于木材日期的稀缺，16个确定的波动中只有4个是准确的：大约14，000到13，500 BP的爱荷华州前进，南达科他州和爱荷华州前进约12，300 BP，密歇根湖盆地前进约11，700 BP，上级湖盆地前进约9900 BP。此外，早在20，000 BP之前，威斯康星冰川晚期的开始也有相当好的记录。该地区西部的波动没有一个是准确的日期。
We propose a chronology of late Wisconsinan glacial fluctuations in middle North America, from Alberta to Wisconsin, based on radiocarbon dates derived solely from wood. Previous chronologies of the southwestern margin of the North American Continental Ice Sheet have depended to a considerable degree on radiocarbon dates from fine-grained organic sediment. This material is commonly contaminated with older carbon, resulting in chronologic confusion. By using only dates from wood, much of the confusion disappears. However, because of the scarcity of wood dates, only four of the sixteen identified fluctuations are accurately dated: an advance into Iowa about 14,000 to 13,500 BP, an advance into South Dakota and Iowa about 12,300 BP, an advance into the Lake Michigan basin about 11,700 BP, and an advance into the Lake Superior basin about 9900 BP. In addition, the beginning of late Wisconsinan glaciation, before 20,000 BP, is fairly well documented. None of the fluctuations in the western part of the region are accurately dated.