10Be analysis of a Quaternary weathering profile in the Virginia Piedmont.

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Samples from a residual weathering profile in the Virginia Piedmont have been analyzed for cosmogenic 10Be. Concentrations are highest in clay-rich soil and decrease exponentially to a depth of about 15 m. Despite uncertainties about the processes by which 10Be may be intercepted before entering the solum and eroded after incorporation, a minimum age may be calculated for the regolith. This calculation is based on the delivery rate of 10Be and its decay rate and suggests that this residual profile developed during a period no shorter than 8 × 105 yr. The calculated minimum age may be within a factor of 2 of maximum-age estimates based on surface lowering by erosion and on the rate of rock weathering to saprolite. The vertical distribution of 10Be in the profile could result from a steady-state balance of deposition, weathering, radioactive decay, and erosion.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title 10Be analysis of a Quaternary weathering profile in the Virginia Piedmont.
Series title Geology
Volume 13
Issue 1
Year Published 1985
Language English
Publisher Geological Society of America
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geology
First page 39
Last page 41