Chlorine-36 and 14C chronology support a limited last glacial maximum across central Chukotka, northeastern Siberia, and no Beringian ice sheet

被引:51
作者
Brigham-Grette, J [1 ]
Gualtieri, LM
Glushkova, OY
Hamilton, TD
Mostoller, D
Kotov, A
机构
[1] Univ Massachusetts, Dept Geosci, Amherst, MA 01003 USA
[2] Univ Washington, Quaternary Res Ctr, Seattle, WA 98195 USA
[3] Russian Acad Sci, Far Eastern Branch, NE Interdisciplinary Res Inst, Magadan 685000, Russia
[4] US Geol Survey, Anchorage, AK 99508 USA
[5] Weston & Sampson Engineers Inc, Portsmouth, NH 03801 USA
[6] Chukotka Sci Ctr, Anadyr, Chukotka Region, Russia
基金
美国国家科学基金会;
关键词
cosmogenic isotopes; last glacial maximum; glacial history; Chukotka; Arctic; Beringia;
D O I
10.1016/S0033-5894(03)00058-9
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
The Pekulney Mountains and adjacent Tanyurer River valley are key regions for examining the nature of glaciation across much of northeast Russia. Twelve new cosmogenic isotope ages and 14 new radiocarbon ages in concert with morphometric analyses and terrace stratigraphy constrain the timing of glaciation in this region of central Chukotka. The Sartan Glaciation (Last Glacial Maximum) was limited in extent in the Pekulney Mountains and dates to similar to20,000 yr ago. Cosmogenic isotope ages > 30,000 yr as well as non-finite radiocarbon ages imply an estimated age no younger than the Zyryan Glaciation (early Wisconsinan) for large sets of moraines found in the central Tanyurer Valley. Slope angles on these loess-mantled ridges are less than a few degrees and crest widths are an order of magnitude greater than those found on the younger Sartan moraines. The most extensive moraines in the lower Tanyurer Valley are most subdued implying an even older, probable middle Pleistocene age. This research provides direct field evidence against Grosswald's Beringian ice-sheet hypothesis. (C) 2003 Elsevier Science (USA). All rights reserved.
引用
收藏
页码:386 / 398
页数:13
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