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A review of burial dating methods using 26Al and 10Be

By
Darryl E. Granger
Darryl E. Granger
Department of Earth and Atmospheric Sciences, Purdue University, West Lafayette, Indiana 47907, USA
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Published:
January 01, 2006

Multiple cosmogenic nuclides with different decay rates can be used to date exposure and burial of rocks over the timescales of radioactive decay. This paper reviews the development of such dating methods over the past ∼50 years, beginning with a historical perspective on early meteorite studies, and later focusing on recent examples in the terrestrial field using the 26Al-10Be pair in quartz.

Two classes of terrestrial applications are discussed in detail. The first involves the use of 26Al and 10Be in rock or sediment that has experienced a complex history of repeated exposure and burial. In these cases, the cosmogenic nuclides can only provide a minimum near-surface age. Examples include sediment from beneath desert sand dunes, and rocks from beneath cold-based glaciers. The second class of application uses 26Al and 10Be to date discrete burial events, in cases where sediment has experienced a simple history of exposure followed by rapid burial. Examples include cave sediments, alluvial deposits, and sediment buried beneath glacial till. Finally, the half-lives of 26Al and 10Be are discussed, with special attention given to discrepant estimates of the 10Be half-life. It is shown that geologic data are consistent with either half-life estimate of 1.51 m.y. or 1.34 m.y., but more closely conform to the shorter half-life.

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Contents

GSA Special Papers

In Situ-Produced Cosmogenic Nuclides and Quantification of Geological Processes

Ana María Alonso-Zarza
Ana María Alonso-Zarza
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Lawrence H. Tanner
Lawrence H. Tanner
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Geological Society of America
Volume
415
ISBN print:
9780813724157
Publication date:
January 01, 2006

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