Abstract
Atmospheric acidic deposition introduces hydrogen ions to terrestrial and aquatic ecosystems, which become partially neutralized by chemical weathering. In the southern Alps of Switzerland, small catchments containing little or no soil and lacking carbonate minerals represent sensitive hydrological settings in which the relationship between alteration of granitic gneiss by acid deposition and the resulting composition of lake waters can be studied. Transmission and scanning electron microscopy, coupled with X-ray powder diffraction of lake sediments from such areas showed mainly unaltered minerals from parent rocks and no secondary silicate minerals. Element mapping indicated noncrystalline aluminum hydroxide as a product of the chemical weathering of silicates. Noncrystalline iron hydroxide was also observed. Mass balance calculations and the stoichiometry of suitable chemical reactions representing the weathering processes were used to derive a plausible reaction sequence on the interaction of the predominant reactive rock minerals with acid precipitation that accounted for the measured chemical composition of the acid lakes.
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Berner, R. A. and Holdren, G. R., Jr. (1977) Mechanism of feldspar weathering: Some observation evidence: Geology 5, 369–372.
Blum, A. and Lasaga, A. (1987) Monte Carlo simulations of surface reaction rate laws: in Aquatic Surface Chemistry, W. Stumm, ed., Wiley-Interscience, New York, 520 pp.
Cornell, R. M. and Giovanoli, R. (1987) The influence of silicate species on the morphology of goethite (α-FeOOH) grown from ferrihydrite (5Fe2Cy9H/2O): Chem. Comm., J. Chem. Soc., London, 413.
Fung, P. C. and Sanipelli, G. (1982) Surface studies of feldspar dissolution using surface replication combined with electron microscopic and spectroscopic techniques: Geo-chim. Cosmochim. Acta 46, 503–512.
Furrer, G. and Stumm, W. (1986) The coordination chemistry of weathering: I. Dissolution kinetics of δ-Al2O3 and BeO: Geochim. Cosmochim. Acta 50, 1847–1860.
Garrels, R. M. and Christ, C. L. (1965) Solutions, Minerals and Equilibria: Harper and Row, New York, 450 pp.
Günthert, A., Stern, W. B., and Schwander, H. (1976) Isochemische Granitgneissbildung im Maggia-Lappen: Schweiz. Min. Petrogr. Mitt. 56, 105–143.
Heggie, M. I. and Zheng, Y. (1987) Planar defects and dissociation of dislocations in a K-feldspar: Phil. Mag. A56, 681–688.
Johnson, C. A. and Sigg, L. (1985) Acidity of rain and fog: Conceptual definitions and practical measurements of acidity: Chimia 39, 59–61.
Keller, W. D. (1978) Kaolinization of feldspar as displayed in scanning electron micrographs: Geology 6, 184–188.
May, H.M., Helmke, P.A., and Jackson, M.L. (1979) Gibb-site solubility and thermodynamic properties of hydroxy-aluminum ions in aqueous solution at 25°C. Geochim. Cosmochim. Acta 43, 861–868.
Miller, W. R. and Drever, J. I. (1977) Chemical weathering and related controls on surface water chemistry in the Absaroka Mountains, Wyoming: Geochim. Cosmochim. Acta 41, 1693–1702.
Mosello, R. and Tartari, G. A. (1987) Chemistry of atmospheric deposition at L. Toggia (2160 m a.s.l.), with emphasis on the sampling procedure: in Proc. 4th Europ. Symp. Physico-Chemical Behaviour of Atmospheric Pollutants, Stresa, Italy, 1986, G. Angeletti and G. Restelli, eds., Rei-del, Dordrecht, 176–187.
Pavlova, V. and Sigg, L. (1988) Adsorption of trace metals on aluminium oxide: Simulation of processes in freshwater systems: Water Research (in press).
Robert, M., Cabidoche, Y.-M., and Berrier, J. (1986) Pédogenèse et minéralogie des sols de haute montagne cristalline (etages alpin et subalpin), science du sol: Bull. Assoc. Franç. Etude Sol, 4, 313–336.
Schnoor, J. L. and Stumm, W. (1985) Acidification of aquatic and terrestrial systems: in Chemical Processes in Lakes, W. Stumm, ed., Wiley-Interscience, New York, 435 pp.
Schnoor, J. L. and Stumm, W. (1986) The role of chemical weathering in the neutralization of acidic deposition: Schweiz. Z. Hydrologie 48, 171–195.
Sigg, L., Stumm, W., Zobrist, J., and Zürcher, F. (1987) The chemistry of fog: Factors regulating its composition: Chimia 41, 159–165.
Stumm, W., Morgan, J. J., and Schnoor, J. L. (1983) Saurer Regen, eine Folge der Störung hydrochemischer Kreisläufe: Naturwissenschaften 70, 216–233.
Stumm, W., Sigg, L., and Schnoor, J. L. (1987a) Aquatic chemistry of acid deposition: Env. Sci. Technol. 21, 8–13.
Stumm, W., Wehrli, B., and Wieland, E. (1987b) Surface complexation and its impact on geochemical kinetics: Croat. Acta 60, 429–456.
Tardy, Y. (1971) Characterization of the principal weathering types by the geochemistry of waters from some European and African crystalline rocks: Chem. Geol. 7, 253–271.
Zobrist, J., Sigg, L., Schnoor, J. L., and Stumm, W. (1987) Buffering mechanisms in acidified alpine lakes: in Reversibility of Acidification, H. Barth, ed., Elsevier, Barking, United Kingdom, 95–103.
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Giovanoli, R., Schnoor, J.L., Sigg, L. et al. Chemical Weathering of Crystalline Rocks in the Catchment Area of Acidic Ticino Lakes, Switzerland. Clays Clay Miner. 36, 521–529 (1988). https://doi.org/10.1346/CCMN.1988.0360605
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DOI: https://doi.org/10.1346/CCMN.1988.0360605