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The petrography of weathering processes: facts and outlooks

Published online by Cambridge University Press:  09 July 2018

A. Meunier ,
P. Sardini ,
J. C. Robinet  and
D. Prêt
A. Meunier*
Affiliation:
University of Poitiers, HYDRASA – UMR 6532 INSU-CNRS, 40 avenue du Recteur Pineau 86022 Poitiers Cedex, France
P. Sardini
Affiliation:
University of Poitiers, HYDRASA – UMR 6532 INSU-CNRS, 40 avenue du Recteur Pineau 86022 Poitiers Cedex, France
J. C. Robinet
Affiliation:
University of Poitiers, HYDRASA – UMR 6532 INSU-CNRS, 40 avenue du Recteur Pineau 86022 Poitiers Cedex, France
D. Prêt
Affiliation:
University of Poitiers, HYDRASA – UMR 6532 INSU-CNRS, 40 avenue du Recteur Pineau 86022 Poitiers Cedex, France
*
*E-mail: [email protected]
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Abstract

Rock weathering has been investigated from atomic to global scales through the different but complementary approaches of mineralogy, petrography, geomorphology and geochemistry. The sequences of mineral reactions involved in the alteration process are now well known. They explain the global trend of weathering phenomena but do not account for the actual rock transformation dynamics. In particular, they ignore the intimate relation of the mineral reaction progress with the increase in connected porosity. At the hand specimen scale, heterogeneity is the rule: mineral reactions are controlled by local physicochemical conditions. Alteration processes depend largely on the rock microstructure properties. They proceed through nearly-closed, semi- and completely open microsystems which are interconnected by fractures or pores. Before being leached out by the solutions which flow in the large fractures (flux), the soluble elements migrate inside the connected porosity through chemical diffusion. The dissolution of the primary minerals is mediated through local gradients of chemical potential. With increasing alteration, the rock porosity increases, as does the length of the fluid passageways and their constrictivity and tortuosity. Consequently, the apparent diffusion coefficient for the most soluble elements decreases. The amplitude of the chemical potential gradients for the most soluble elements is reduced by the progressive coating of the reactive surfaces by clays and Fe oxyhydroxides. The residence time of these elements inside the weathered rock increases as alteration progresses; an effect enhanced by their temporary adsorption on the exchangeable sites of clays and Fe oxyhydroxides. Consequently, the weathering rate decreases with time. A possible new way to calculate weathering rates could be to measure the residence time of soluble elements inside the different microsystems during their migration towards the diluted solution which occurs in the large fractures.

Keywords

weatheringdiffusionmicrosystemsmass balanceresidence time
Type
Research Article
Information
Clay Minerals , Volume 42 , Issue 4 , December 2007 , pp. 415 - 435
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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References

Allègre, C.J., Dupré, B., Négrel, P. & Gaillardet, J. (1986) Sr-Nd-Pb isotope systematics in Amazon and Congo river systems: constraints about erosion processes. Chemical Geology, 131, 93–112.Google Scholar
Archie, G.E. (1942) The electrical resistivity Log as an aid in determining some reservoir characteristics. American Institute of Mineral and Metallurgical Engineering, 1422, 1–8.Google Scholar
Banfield, J.F. & Barker, W.W. (1994) Direct observation of reactant-product interfaces formed in natural weathering of exsolved, defective amphibole to smectite: evidence for episodic, isovolumetric reactions involving structural inheritance. Geochimica et Cosmochimica Acta, 58, 1419–1429.Google Scholar
Banfield, J.F. & Eggleton, R.A. (1988) Transmission electron microscope study of biotite weathering. Clays and Clay Minerals, 36, 47–60.CrossRefGoogle Scholar
Banfield, J.F. & Eggleton, R.A. (1990) Analytical transmission electron microscope study of plagioclase, muscovite and K-feldspar weathering. Clays and Clay Minerals, 38, 77–89.CrossRefGoogle Scholar
Berner, R.A. (1978) Rate control of mineral dissolution under Earth surface conditions. American Journal of Science, 278, 1235–1252.Google Scholar
Berner, R.A. (1981) Kinetics of weathering and diagenesis. Pp. 111–134 in: Kinetics of Geochemical Processes (Lasaga, A.C. & Kirkpatrick, R.J., editors). Reviews in Mineralogy, 8, Mineralogical Society of America.CrossRefGoogle Scholar
Berner, R.A. & Schott, J. (1982) Mechanism of pyroxene and amphibole weathering —II. Observation of soil grains. American Journal of Science, 282, 1214–1231.Google Scholar
Bisdom, E.B.A. (1967) Micromorphology of a weathered granite near Ria de Arosa (NW Spain). Leidse Geologische Mededelingen, 37, 33–67.Google Scholar
Brantley, S.L. (2005) Reaction kinetics of primary rockforming minerals under ambient conditions. Pp. 73–117 in: Surface and Ground Water, Weathering and Soils (Drever, J.J., editor) Treatise on Geochemistry, 5, Elsevier, Amsterdam.Google Scholar
Brantley, S.L. & Melott, N.P. (2000) Surface area and porosity of primary silicate minerals. American Mineralogist, 85, 1767–1783.Google Scholar
Byegard, J., Widestrand, H., Skalberg, M., Tullborg, E.L. & Siitari Kauppi, M. (2001) Complementary investigation of diffusivity, porosity and sorptivity of Feature A-site specific geologic material. International Cooperation Report, ICR-01-04, 51 pp.Google Scholar
Carrera, J., Sánchez-Vila, X., Benet, I., Medina, A., Galarza, G. & Guimerà, J. (1998) On matrix diffusion: formulations, solution methods and qualitative effects. Hydrogeology Journal, 6, 178–190.Google Scholar
Colman, S.M. (1986) Levels of time information in weathering measurements, with examples from weathering rinds on volcanic clasts in the western United States. Pp. 379–393 in: Rates of Chemical Weathering of Rocks and Minerals (Colman, S.M. & Dethier, D.P., editors). Academic Press Inc. Orlando, Florida, USA.Google Scholar
Delay, F. & Porel, G. (2003) Inverse modelling in the time domain for solving diffusion in a heterogeneous rock matrix. Geophysical Research Letters, 30, 1147.Google Scholar
Dethier, D.P. (1986) Weathering rates and chemical flux from catchments in the Pacific Northwest, U.S.A. Pp. 503–530 in: Rates of Chemical Weathering of Rocks and Minerals (Colman, S.M. & Dethier, D.P., editors). Academic Press Inc. Orlando, Florida, USA.Google Scholar
Ebelmen, M. (1847) Recherches sur la décomposition des roches. Annales des Mines, 12, 627–654.Google Scholar
Eggleton, R.A. (1984) Formation of iddingsite rims on olivine: a transmission electron microscope study. Clays and Clay Minerals, 32, 1–11.Google Scholar
Eggleton, R.A. & Buseck, P.R. (1980) High resolution electron microscopy of feldspar weathering. Clays and Clay Minerals, 28, 173–178.CrossRefGoogle Scholar
Fontanaud, A. & Meunier, A. (1983) Mineralogical facies of a weathered serpentinized lherzolite from the Pyrénées, France. Clay Minerals, 18, 77–88.Google Scholar
Gaillardet, J., Dupré, B., Louvat, P. & Allègre, C.J. (1999) Global silicate weathering and CO2 consumption deduced from the chemistry of large rivers. Chemical Geology, 159, 3–30.Google Scholar
Ganor, J., Roueff, E., Erel, Y. & Blum, J.D. (2005) The dissolution kinetics of a granite and its minerals —Implications for comparison between laboratory and field dissolution rates. Geochimica et Cosmochimica Acta, 69, 607–621.Google Scholar
Garrels, R.M. & Christ, L.L. (1965) Solutions, Minerals and Equilibria. Freeman, Cooper, San Francisco, USA, 450 pp.Google Scholar
Gautier, J.M., Oelkers, E.H. & Scott, J. (2001) Are quartz dissolution rates proportional to B.E.T. surface areas. Geochimica et Cosmochimica Acta, 65, 1059–1070.Google Scholar
Hadermann, J. & Heer, W. (1996) The Grimsel (Switzerland) migration experiment: integrating field experiments, laboratory investigations and modelling. Journal of Contaminant Hydrology, 21, 87–100.Google Scholar
Hellmuth, K.H., Siitari-Kauppi, M. & Lindberg, A. (1993) Study of the porosity and migration pathways in crystalline rock by impregnation with 14C-polyméthylmethacrylate. Journal of Contaminant Hydrology, 13, 403–418.Google Scholar
Hochella, M.F. & Banfield, J.F. (1995) Chemical weathering of silicates in nature: a microscopic perspective with theoretical considerations. Pp. 353–406 in: Chemical Weathering Rates of Silicate Minerals (White, A.F. & Brantley, S.L., editors). Reviews in Mineralogy, 31, Mineralogical Society of America.Google Scholar
Hodson, M.E. (2003) The influence of Fe-rich coatings on the dissolution of anorthite at pH 2.6. Geochimica et Cosmochimica Acta, 67, 3355–3363.Google Scholar
Ildefonse, P. (1980) Mineral facies developed by weathering of a meta-gabbro. Loire Atlantique (France). Geoderma, 24, 257–273.Google Scholar
Korzhinskii, D.S. (1959) Physicochemical Basis of the Analysis of the Paragenesis of Minerals (translation). Consultant Bureau, New York, 143 pp.Google Scholar
Mammar, N., Rosanne, M., Prunet-Foch, B., Thovert, J.F., Tevissen, E. & Adler, P.M. (2001) Transport properties of compact clays. 1. Conductivity and permeability. Journal of Colloid and Interface Science, 240, 498–508.Google Scholar
Meunier, A. (1980) Les mécanismes de l’altération des granites et le rôle des microsystèmes. Etude des arènes du massif granitique de Parthenay. Mémoires de la Société Géologique de France, 140, 80.Google Scholar
Meunier, A. (2005) Clays. Springer-Verlag, Berlin, 472 pp.Google Scholar
Meunier, A. (2006) Why are clay minerals small. Clay Minerals, 41, 551–566.Google Scholar
Meunier, A. & Velde, B. (1979) Weathering mineral facies in altered granites: the importance of local small-scale equilibria. Mineralogical Magazine, 43, 261–268.Google Scholar
Millot, G. (1964) Géologie des Argiles. Masson and Cie, Paris, 499 pp.Google Scholar
Neretnieks, I. (1980) Diffusion in the rock matrix: an important factor in radionuclide retardation. Journal of Geophysical Research, 85, B8, 4379–4397.Google Scholar
Nugent, M.A., Brantley, S.L., Pantano, S.G. & Maurice, P.A. (1998) The influence of natural mineral coatings on feldspar weathering. Nature, 396, 588–591.Google Scholar
Oila, E., Sardini, P., Siitari-Kauppi, M. & Hellmuth, K.H. (2005) The 14C-polymethylmethacrylate (PMMA) impregnation method and image analysis as a tool for porosity characterization of rock-forming minerals. Pp. 335–342 in: Petrophysical Properties of Crystalline Rocks (Harvey, P.K., Bewer, T.S., Pezard, P.A. & Petrov, V.A., editors). Special Publication 240. Geological Society, London.Google Scholar
Ollier, C. & Pain, C. (1996) Regolith, Soils and Landforms. John Wiley & Sons, Chichester, UK, 316 pp.Google Scholar
Pacheco, F.A.L. & Alencoão, A.M.P. (2006) Role of fractures in weathering of solid rocks: narrowing the gap between laboratory and field weathering rates. Journal of Hydrology, 316, 248–265.Google Scholar
Parkhomenko, E.I. (1967) Electrical Properties of Rocks, (translation Keller, G. V.). Plenum Press, New York, 314 pp.Google Scholar
Prêt, D. (2003) Nouvelles méthodes quantitatives de cartographie de la porosité et de la minéralogie dans les matériaux argileux: application aux bentonites compactées des barrières ouvragées. PhD thesis, Université de Poitiers, France, 240 pp.Google Scholar
Putnis, A. (2002) Mineral replacement reactions: from macroscopic observations to microscopic mechanisms. Mineralogical Magazine, 66, 689–708.Google Scholar
Revil, A. (1999) Ionic diffusivity, electrical conductivity, membrane and thermoelectric potentials in colloids and granular porous media: a unified model. Journal of Colloid Interface Science, 212, 503–522.CrossRefGoogle ScholarPubMed
Revil, A., Leroy, P. & Titov, K. (2005) Characterization of transport properties of argillaceous sediments: application to the Callovo-Oxfordian argillite. Journal of Geophysical Research, 110, 1–18.Google Scholar
Righi, D. & Meunier, A. (1995) Origin of clays by rock weathering and soil formation. Pp. 43–161 in: Origin and Mineralogy of Clays: Clays and the Environment (Velde, B., editor), Springer-Verlag, Heidelberg, Germany.Google Scholar
Robinet, J.C., Sardini, P., Delay, F. & Hellmuth, K.H. (2007) The effect of rock matrix heterogeneities near fracture walls on the residence time distribution (RTD) of solutes. Transport in Porous Media (in press).Google Scholar
Sak, P.B., Fisher, D.M., Gardner, T.W., Murphy, K. & Brantley, S.L. (2004) Rates of weathering rind formation on Costa Rican basalt. Geochimica et Cosmochimica Acta, 68, 1453–1472.Google Scholar
Sardini, P., Sammartino, S. & Tévissen, E. (2001) An image analysis contribution to the study of transport properties of low-permeability crystalline rocks. Computer Geosciences, 27, 1051–1059.Google Scholar
Sardini, P., Delay, F., Hellmuth, K.H., Porel, G. & Oila, E. (2003) Interpretation of diffusion experiments on crystalline rocks using random walk modelling. Journal of Contaminant Hydrology, 61, 339–350.Google Scholar
Sardini, P., Siitari-Kaupi, M., Beaufort, D. & Hellmuth, K.H. (2006) On the connected porosity of mineral aggregates in crystalline rocks. American Mineralogist, 91, 1069–1080.Google Scholar
Sardini, P., Robinet, J.C., Siitari-Kauppi, M., Delay, F. & Hellmuth, K.H. (2007) Direct simulation of heterogeneous diffusion and inversion procedure applied to an out-diffusion experiment. Test case of Palmottu granite. Journal of Contaminant Hydrology, 93, 21–37.Google Scholar
Sato, H. (1999) Matrix diffusion of some simple cations, anions, and neutral species in fractured crystalline rocks. Nuclear Technology, 127, 199–211.Google Scholar
Sausse, J., Jacquot, E., Leroy, J. & Lespinasse, M. (2001) Evolution of crack permeability during fluid-rock interaction. Example of the Brézouard granite (Vosges, France). Tectonophysics, 336, 199–214.Google Scholar
Siitari-Kauppi, M., Marcos, N., Klobes, P., Goebbels, J., Timonen, J. & Hellmuth, K.H. (2003) The Palmottu natural project. Physical rock matrix characterisation. Geological Survey of Finland Report, YST118, 63 pp.Google Scholar
Tardy, Y. (1993) Pétrologie des Latérites et des Sols tropicaux. Masson, Paris, 535 pp.Google Scholar
Velbel, M.A. (1993) Formation of protective surface layers during silicate-mineral weathering under wellleached, oxidizing conditions. American Mineralogist, 78, 405–414.Google Scholar
White, A.F. & Brantley, S.L. (1995) Chemical weathering rates of silicate minerals: an overview. Pp. 1–22 in: Chemical Weathering Rates of Silicate Minerals (White, A.F. & Brantley, S.L., editors). Reviews in Mineralogy, 31, Mineralogical Society of America, Washington, D.C. Google Scholar
White, A.F. & Brantley, S.L. (2003) The effects of time on the weathering of silicate minerals: why do weathering rates differ in the laboratory and field. Chemical Geology, 202, 479–506.Google Scholar
White, A.F., Bullen, T.D., Schulz, M.S., Blum, A.E., Huntington, T.G. & Peters, N.E. (2001) Differential rates of feldspar weathering in granitic regoliths. Geochimica et Cosmochimica Acta, 65, 847–869.Google Scholar
Whitehouse, I.E., McSaveney, M.J., Knuepfer, P.L.K. & Chinn, T.J.H. (1986) Growth of the weathering rinds on Torlesse Sandstone, Southern Alps, New Zealand. Pp. 419–435 in: Rates of Chemical Weathering of Rocks and Minerals (Colman, S.M. & Dethier, D.P., editors). Academic Press Inc., Orlando, Florida, USA.Google Scholar
Wilson, M.J. (2004) Weathering of the primary rock-forming minerals: processes, products and rates. Clay Minerals, 39, 233–266.Google Scholar
Wright, E.P. & Burgess, W.D. (1992) The Hydrology of Crystalline Basement Aquifers in Africa. Special Publication 66. Geological Society, London. 264 pp.Google Scholar