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The edge of time: Dating young volcanic ash layers with the 40Ar- 39Ar laser probe

Science

By:
, , , , and
DOI: 10.1126/science.274.5290.1176

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Abstract

Argon-40-argon-39 single-crystal dating of young (5000 to 30,000 years ago) volcanic ash layers erupted from the Mono Craters, California, shows that the method can yield meaningful ages in Holocene tephra. Because of ubiquitous xenocrystic contamination, the data do not form isochrons but plot in wedge-shaped regions on an argon isotopic diagram. The upper boundary of the region is an isochron matching the 14C-derived age of the eruption. Such contamination-related patterns may be common in dating young materials by the single-crystal method. Argon dating by this method can help refine the time scale of physical and biological evolution over the past 100,000 years.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The edge of time: Dating young volcanic ash layers with the 40Ar- 39Ar laser probe
Series title:
Science
DOI:
10.1126/science.274.5290.1176
Volume
274
Issue:
5290
Year Published:
1996
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1176
Last page:
1178
Number of Pages:
3