Age and significance of the Late Pleistocene Dawson tephra in eastern Beringla

被引:36
作者
Froese, D [1 ]
Westgate, J
Preece, S
Storer, J
机构
[1] Simon Fraser Univ, Dept Earth Sci, Burnaby, BC V5A 1S6, Canada
[2] Govt Yukon, Whitehorse, YT Y1A 2C6, Canada
[3] Univ Toronto, Dept Geol, Toronto, ON M5S 3B1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
D O I
10.1016/S0277-3791(02)00038-0
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
Dawson tephra, recently recognized in the Klondike area of Yukon Territory, records one of the largest Quaternary volcanic eruptions in Beringia. Its composition is similar to that of Old Crow tephra, indicating a source in the Aleutian arc-Alaska Peninsula region of southwestern Alaska. Its primary thickness in central Yukon is nearly twice that of Old Crow tephra, which has an estimated eruption volume of > 50 km(3). The distribution of Dawson tephra is still poorly known, but based on its source area and occurrence in central Yukon, it should be widespread across southern Alaska, Yukon and the Gulf of Alaska. New radiocarbon ages indicate the eruption occurred at about 24,000 C-14 yr BP (ca 27,000 cal yr BP). The Dawson tephra is a valuable marker bed for correlating late Pleistocene records across large areas of eastern Beringia and adjacent marine records. (C) 2002 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:2137 / 2142
页数:6
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