Hydrological controls on chemical weathering rates at the soil-bedrock interface

Emmanuel J. Gabet*, Robin Edelman, Heiko Langner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

Chemical weathering of bedrock is critical to maintaining terrestrial life, and climate, typically as manifested by precipitation, is often identified as having a first-order control on rates of chemical weathering. The ability of precipitation to dissolve rock, however, is modulated by the properties of the overlying soil that influence the contact time between water and minerals. Flume experiments were conducted to investigate the hydrological controls on rates of chemical weathering. Solute concentrations of runoff flowing across synthetic bedrock overlain by nonreactive pseudosoils of differing hydraulic conductivities were measured to examine the role of seepage velocity in influencing weathering rates on steep slopes. The results suggest that, where weathering is not limited by the supply of fresh minerals, weathering rates should increase with decreasing hydraulic conductivity. In addition, a mathematical relationship between hydraulic conductivity and chemical weathering on hillslopes is introduced to explore the hydrological controls on feldspar and calcite dissolution rates. The mathematical model supports the results from the experiments.

Original languageEnglish (US)
Pages (from-to)1065-1068
Number of pages4
JournalGeology
Volume34
Issue number12
DOIs
StatePublished - Dec 1 2006

Keywords

  • Advective-dispersion equation
  • Chemical weathering
  • Dissolution
  • Hillslope hydrology
  • Hydraulic conductivity
  • Soil production

ASJC Scopus subject areas

  • Geology

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