Clays and Clay Minerals

, Volume 41, Issue 3, pp 365–372 | Cite as

Low Temperature Experimental Investigation of the Effect of High pH Koh Solutions on the Opalinus Shale, Switzerland

  • J. A. Chermak


Batch reactor experiments were performed at 150°C, 175°C, and 200°C to determine the effect of high pH KOH solutions on the mineralogy of the Opalinus shale. In these experiments, the change in solution quench pH at 25°C, solution composition, and mineralogy were monitored as a function of time for up to ≈ 50 days. Runs were performed in 50 ml titanium hydrothermal reactor vessels. Each reactor was charged with 0.5–5.0 grams of the 80–200 mesh size fraction of Opalinus shale, and 25 ml of solution (0.08 and 0.008 m KOH). Under these high pH conditions, the general sequence of reaction products observed is the formation of phillipsite, followed by K-feldspar ± K-rectorite. Phillipsite is a metastable intermediate that eventually transforms to K-feldspar. This sequence of mineral reaction products is very different from that found in the NaOH system.

Key Words

Experimental investigation High pH K-rectorite K-feldspar Opalinus shale Phillipsite 


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  1. Barrer, R. M. (1982) Hydrothermal Chemistry of Zeolites: Academic Press, New York.Google Scholar
  2. Barth-Wirsching, U. and Höller, H. (1989) Experimental studies on zeolite formation conditions: European Journal of Mineralogy 1, 489–506.CrossRefGoogle Scholar
  3. Brindley, G. W. (1980) Quantitative X-ray mineral analysis of clays: in Crystal Structures of Clay Minerals and Their X-ray Identification, G. W. Brindley and G. Brown, eds., Mineralogical Society, London, 411–438.Google Scholar
  4. Chermak, J. A. (1992) Low temperature experimental investigation of the effect of high pH NaOH solutions on the Opalinus shale, Switzerland: Clays & Clay Minerals 40, 650–658.CrossRefGoogle Scholar
  5. Chermak, J. A. and Rimstidt, J. D. (1990) The hydrothermal transformation rate of kaolinite to muscovite/illite: Geochim. et Cosmochim. Acta 54, 2979–2990.CrossRefGoogle Scholar
  6. Donahoe, R. J., Liou, J. G., and Guldman, S. (1984) Synthesis and characterization of zeolites in the system Na2O-K2O-Al2O3-SiO2-H2O: Clays & Clay Minerals 32, 433–443.CrossRefGoogle Scholar
  7. Donahoe, R. J. and Liou, J. G. (1985) An experimental study on the process of zeolite formation: Geochim. et Cosmochim. Acta 49, 2349–2360.CrossRefGoogle Scholar
  8. Eberl, D. (1978) Reaction series for dioctahedral smectites: Clays & Clay Minerals 26, 327–340.CrossRefGoogle Scholar
  9. Eberl, D. and Hower, J. (1977) The hydrothermal transformation of sodium and potassium smectite into mixed layer clay: Clays & Clay Minerals 25, 215–227.CrossRefGoogle Scholar
  10. Gieskes, J. and Peretsman, G. (1986). Water Chemistry procedures aboard Joides Resolution—Some comments: Ocean Drilling Program Technical Note No. 5, Texas A&M University.Google Scholar
  11. Govett, G. J. S. (1961) Critical factors in the colorimetric determination of silica: Analytica Chimica Acta 25, 69–80.CrossRefGoogle Scholar
  12. Hawkins, D. B., Sheppard, R. A., and Gude, 3rd, A. J. (1978) Hydrothermal synthesis of clinoptilolite and comments on the assemblage phillipsite-clinoptilolite-mordenite: in Natural Zeolites, L. B. Sand and F. A. Mumpton, eds., 337–344.Google Scholar
  13. Hawkins, D. B. (1981) Kinetics of glass dissolution and zeolite formation under hydrothermal conditions: Clays & Clay Minerals 29, 331–340.CrossRefGoogle Scholar
  14. Hay, R. L. (1966) Zeolites and zeolite reactions in sedimentary rocks: GSA Special Paper 85.Google Scholar
  15. Hay, R. L. (1978) Geologic occurrence of zeolites: in Natural Zeolites, L. B. Sand and F. A. Mumpton, eds., Pergamon Press, New York, 135–143.Google Scholar
  16. Hay, R. L. (1986) Geologic occurrence of zeolites and some associated minerals: Pure and Applied Chemistry 58, 1339–1342.CrossRefGoogle Scholar
  17. Hemley, J. J. (1959) Some mineralogical equilibria in the system K2O-Al2O3-SiO2-H2O: Amer. J. Sci. 257, 241–270.CrossRefGoogle Scholar
  18. Hess, P. C. (1966) Phase equilibria of some minerals in the K2O-Al2O3-SiO2-H2O system at 25°C and 1 atmosphere: Amer. J. Sci. 264, 289–309.CrossRefGoogle Scholar
  19. Hower, J., Eslinger, E. V., Hower, M., and Perry, E. A. (1976) Mechanism of burial metamorphism of argillaceous sediments: I. Mineralogical and chemical evidence: Geological Society of America Bulletin 87, 725–737.CrossRefGoogle Scholar
  20. Kodama, H. (1966) The nature of the component layers of rectorite: Amer. Mineral. 51, 1035–1055.Google Scholar
  21. Matsuda, T. and Henmi, K. (1983) Syntheses and properties of regularly interstratified 25 Å minerals: Clay Science 6, 51–66.Google Scholar
  22. Merck AG, E. (1966) Organische reagenzien für die anorganische analyse: Verlag Chemie GMBH, Weinheim, Germany.Google Scholar
  23. Moore, D. M. and Reynolds, Jr., R. C. (1989) X-ray Diffraction and the Identification and Analysis of Clay Minerals, Oxford University Press, New York.Google Scholar
  24. Pawloski, G. A. (1985) Quantitative determination of mineral content of geologic samples by X-ray diffraction: Amer. Mineral. 70, 663–667.Google Scholar
  25. Pevear, D. R., Williams, V. E., and Mustoe, G. E. (1980) Kaolinite, smectite, and K-rectorite in bentonites: Relation to coal rank at Tulameen, British Columbia: Clays & Clay Minerals 28, 241–254.CrossRefGoogle Scholar
  26. Snyder, R. L. and Bish, D. L. (1989) Quantitative analysis: in Modern Powder Diffraction, Reviews in Mineralogy 20, D. L. Bish and J. E. Post, eds., Mineralogical Society of America, Washington, D.C., 101–142.CrossRefGoogle Scholar
  27. Varian (1979) Analytical methods for flame spectroscopy: Varian Techtron Pty. Ltd., Springvale, Australia.Google Scholar
  28. Velde, B. (1985) Clay minerals, A physico-chemical explanation of their occurrence: Developments in Sedimentology 40, Elsevier, New York.Google Scholar
  29. Whitney, G. and Northrop, H. R. (1988) Experimental investigation of the smectite to illite reaction: Dual reaction mechanisms and oxygen-isotope systematics: Amer. Mineral. 73, 77–90.Google Scholar

Copyright information

© The Clay Minerals Society 1993

Authors and Affiliations

  • J. A. Chermak
    • 1
  1. 1.Mineralogisch-Petrographisches Inst.Universtät BernBernSwitzerland

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