Authors: White, A.F.; Schulz, M.S.; Stonestrom, D.A.; Vivit, D.V.; Fitzpatrick, J.; Bullen, T.

Source: Mineralogical Magazine, Volume 72, Number 1, February 2008 , pp. 149-153(5)

Publisher: Mineralogical Society

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.

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Document Type: Research article

DOI: http://dx.doi.org/10.1180/minmag.2008.072.1.149

Publication date: 2008-02-01

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