L. Brown
J. Harden
J. Klein
R. Middleton
M.J. Pavich
1986
<p><span>The distribution and residence time of cosmogenic </span><sup>10</sup><span>Be in clay-rich soil horizons is fundamental to understanding and modelling the migration of </span><sup>10</sup><span>Be on terrestrial sediments and in groundwater solutions. We have analyzed seven profiles of clay-rich soils developed from terrace sediments of the Merced River, California. The terraces and soils of increasing age are used to compare the </span><sup>10</sup><span>Be inventory with a simple model of accumulation, decay and erosion. The data show that the distribution of </span><sup>10</sup><span>Be varies with soil horizon clay content, that the residence time of </span><sup>10</sup><span>Be in these horizons exceeds 10</span><sup>5</sup><span> years, and that to a rough approximation the inventory of </span><sup>10</sup><span>Be in a thoroughly sampled soil profile fits the equation: </span><i>N</i><span> = (</span><i>q</i><span> − </span><i>Em</i><span>)(1 − </span><i>e</i><sup>−<i>λι</i></sup><span>)/</span><i>λ</i><span> where </span><i>q</i><span> is delivery rate, </span><i>E</i><span> is erosion rate, </span><i>m</i><span> is the concentration of </span><sup>10</sup><span>Be in the eroding surface layer, λ is the decay constant, and </span><i>t</i><span> is the age of the depositional unit from which the soil has developed. The general applicability of this model is uncertain and warrants further testing in well-calibrated terrace sequences.</span></p>
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10.1016/0016-7037(86)90134-1
en
Elsevier
10Be distribution in soils from Merced River terraces, California
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