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- Publisher
- Springer Journals
- Copyright
- Copyright
- Subject
- Earth Sciences; Geochemistry; Hydrology/Water Resources; Hydrogeology; Water Quality/Water Pollution
- ISSN
- 1380-6165
- eISSN
- 1573-1421
- DOI
- 10.1007/BF00702888
- Publisher site
- See Article on Publisher Site
Abstract
Based on the geological background, R-mode factor statistics, and the analysis of the stability diagram for the corresponding system, five weathering reactions controlling the surface-water chemical composition in the watershed of the Changhuajiang River are deduced. In the mass balance model, the precipitation accounts for some solute input, since the rainwater is dilute without pollution. Most of the Ca2+ and HCO 3 − ions are from the dissolution of calcite, K+, Na+, H4SiO4 and some of the Mg2+ and HCO 3 − come from albite and biotite weathering to kaolinite. The dissolution of dolomite and gypsum controls the mass balances of Mg2+ and SO 4 2− . The dissolution of calcite is the dominant chemical weathering reaction in the watershed because of its reactivity and high concentration. In the watershed in 1986, the chemical weathering rate was 0.073 (kg/m2 a), and the mechanical denudation rate is 0.093 (kg/m2 a). The chemical weathering mass output proportion of carbonate rocks to silicate rocks was about three to one.
Journal
Aquatic Geochemistry – Springer Journals
Published: Nov 11, 2004