Solute profiles in soils, weathering gradients and exchange equilibrium/disequilibrium
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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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Solute profiles in soils, weathering gradients and exchange equilibrium/disequilibrium |
| Series title | Mineralogical Magazine |
| DOI | 10.1180/minmag.2008.072.1.149 |
| Volume | 72 |
| Issue | 1 |
| Year Published | 2008 |
| Language | English |
| Publisher | Mineralogical Society |
| Description | 5 p. |
| First page | 149 |
| Last page | 153 |
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