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

Abstract

Research Article| January 01, 1985 10Be analysis of a Quaternary weathering profile in the Virginia Piedmont M. J. Pavich; M. J. Pavich 1U.S. Geological Survey, Reston, Virginia 22092 Search for other works by this author on: GSW Google Scholar Louis Brown; Louis Brown 2Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D.C. 20015 Search for other works by this author on: GSW Google Scholar J. Nathalie Valette-Silver; J. Nathalie Valette-Silver 2Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, D.C. 20015 Search for other works by this author on: GSW Google Scholar Jeffrey Klein; Jeffrey Klein 3Tandem Accelerator Laboratory, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Search for other works by this author on: GSW Google Scholar Roy Middleton Roy Middleton 3Tandem Accelerator Laboratory, University of Pennsylvania, Philadelphia, Pennsylvania 19104 Search for other works by this author on: GSW Google Scholar Geology (1985) 13 (1): 39–41. https://doi.org/10.1130/0091-7613(1985)13<39:BAOAQW>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation M. J. Pavich, Louis Brown, J. Nathalie Valette-Silver, Jeffrey Klein, Roy Middleton; 10Be analysis of a Quaternary weathering profile in the Virginia Piedmont. Geology 1985;; 13 (1): 39–41. doi: https://doi.org/10.1130/0091-7613(1985)13<39:BAOAQW>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract 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. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.