Dating Disappearing Ice With Cosmogenic Nuclides

被引：31

作者：

Ivy-Ochs, Susan ^{[1
,2
]}

Briner, Jason P. ^{[3
]}

机构：

[1] ETH, Lab Ion Beam Phys, CH-8093 Zurich, Switzerland

[2] Univ Zurich, Dept Geog, CH-8057 Zurich, Switzerland

[3] SUNY Buffalo, Dept Geol, Buffalo, NY 14260 USA

来源：

ELEMENTS | 2014年 / 10卷 / 05期

关键词：

surface exposure dating; moraine; glacially modified bedrock; deglaciation age; Be-10; HOLOCENE GLACIER VARIATIONS; BE-10; EROSION; MAXIMUM; RATES; DEGLACIATION; PLEISTOCENE; GREENLAND; RETREAT; VALLEY;

D O I：

10.2113/gselements.10.5.351

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Cosmogenic nuclides are remarkably well suited to dating glacial landforms. Exposure dating of boulders on moraines and of glacially sculpted bedrock allows the determination of the ages of former ice margins, from which past glaciations can be temporally constrained. Where moraines are lacking or are poorly preserved, outwash is dated with depth-profile dating. Two-nuclide methods can be used to determine the ages of buried till. Multinuclide measurements of bedrock ages also provide insights into periods of non-erosive ice coverage and can be used to identify regions with selective linear erosion. Of particular interest is the use of cosmogenic nuclides to assess rates of glacier retreat and glacial erosion.

引用

页码：351 / 356

页数：6

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