@article {White:February 2008:0026-461X:149,
author = "White, A.F.",
author = "Schulz, M.S.",
author = "Stonestrom, D.A.",
author = "Vivit, D.V.",
author = "Fitzpatrick, J.",
author = "Bullen, T.",
title = "Solute profiles in soils, weathering gradients and exchange equilibrium/disequilibrium",
journal = "Mineralogical Magazine",
volume = "72",
year = "February 2008",
abstract = "The spatial and temporal changes in hydrology and pore water elemental and 87/86Sr compositions were used to determine contemporary weathering rates in a 65 to 226 ky old soil chronosequence formed from granitic sediments deposited on marine terraces along coastal California. Cl-corrected Na, K and Si increased with depth denoting inputs from the weathering of plagioclase and K-feldspar. Solute 87/86Sr exhibited progressive mixing of sea water-dominated precipitation with inputs from less radiogenic plagioclase. Linear approximations to these weathering gradients were used to determine plagioclase weathering rates of between 0.38 and 8.9 × 10−15 moles m−2 s−1. The lack of corresponding weathering gradients for Ca and Sr indicated short-term equilibrium with the clay ion exchange pool which requires periodic resetting by natural perturbations to maintain continuity, in spite of soil composition changes reflecting the effects of long-term weathering.",
pages = "149-153(5)",
url = "http://www.ingentaconnect.com/content/minsoc/mag/2008/00000072/00000001/art00033"
doi = "doi:10.1180/minmag.2008.072.1.149"
}