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

被引：53

作者：

Chen, YS ^{[1
]}

Smith, PE ^{[1
]}

Evensen, NM ^{[1
]}

York, D ^{[1
]}

Lajoie, KR ^{[1
]}

机构：

[1] US GEOL SURVEY, MENLO PK, CA 94025 USA

来源：

SCIENCE | 1996年 / 274卷 / 5290期

关键词：

D O I：

10.1126/science.274.5290.1176

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 C-14-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.

引用

页码：1176 / 1178

页数：3

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