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Origin of the Bentonite Deposits of Eastern Milos, Aegean, Greece: Geological, Mineralogical and Geochemical Evidence

Published online by Cambridge University Press:  28 February 2024

George E. Christidis ,
Peter W. Scott  and
Theodor Marcopoulos
George E. Christidis
Affiliation:
Technical University of Crete, Department of Mineral Resources Engineering, 73133 Chania, Crete, Greece
Peter W. Scott
Affiliation:
Camborne School of Mines, Redruth Cornwall, TRI 5 3SE
Theodor Marcopoulos
Affiliation:
Technical University of Crete, Department of Mineral Resources Engineering, 73133 Chania, Crete, Greece
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Abstract

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The Lower Pleistocene bentonite deposits of Eastern Milos, Greece have been formed at the expense of volcaniclastic rocks under submarine conditions. Systematic variation of the major chemical elements reveals that the deposits were formed from different precursors which were erupted from different volcanic centers belonging to at least two separate volcanic provinces. The volcanic eruptions were probably subaqueous. The major authigenic phases are smectite, K-feldspar, opal-CT and the zeolites mordenite and clinoptilolite. The deposits have a complex history and have been affected by hydrothermal alteration.

The geological features of bentonites coupled by the presence of abundant authigenic K-feldspar indicate that alteration of the parent volcanoclastic rocks took place under low temperatures and is probably not related to hydrothermal alteration, which is a separate event. Hydrothermal alteration has modified both the mineralogical characteristics and the properties of bentonites. Alteration of the parent rocks to bentonites was favoured by high water: wall rock ratios and fluid flow and is associated with leaching and subsequent removal of Na, K and Ca. The source of Mg was the parent rocks and only small scale Mg-uptake from the sea water has probably taken place. The formation of authigenic K-feldspar has probably been favoured by a high K+/H+ activity ratio and high Si activity of the pore fluid. Such conditions might have been favoured by the pH conditions and the cooling history of the parent rocks.

Keywords

Authigenic K-feldsparBentoniteElectron microscopyHydrothermal alterationInfrared spectroscopyLow temperature alterationSmectiteX-ray diffractionX-ray fluorescenceZeolites
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 1 , February 1995 , pp. 63 - 77
Copyright
Copyright © 1995, The Clay Minerals Society

References

Alexiev, B., and Djourova, E. Genetic features of zeolitic rocks in Bulgaria. In Occurrence, Properties and Utilization of Natural Zeolites. Kallo, D., and Sherry, H. S., 1988 eds. Budapest: Akademiai Kiado, 77–85.Google Scholar
Altaner, S. P., and Grim, R. E. 1990 . Mineralogy, chemistry and diagenesis of tuffs in the Sucker Creek Formation (miocene) Eastern Oregon. Clays & Clay Miner. 38: 561–572.CrossRefGoogle Scholar
Bennet, H., and Oliver, G. J. 1976 . Development of fluxes for the analysis of ceramic materials by X-ray spectrometry. Analyst 101: 803–807.CrossRefGoogle Scholar
Boles, J. R., and Surdam, R. C. 1979 . Diagenesis of volcanogenic sediments in a Tertiary saline lake, Wagon Red Formation. Am. J. Sci 279: 832–853.CrossRefGoogle Scholar
Breck, D. W., 1974. Zeolite Molecular Sieves. New York: Wiley Interscience. 771 pp.Google Scholar
Cas, R. A. F., and Wright, J. V. 1988 . Volcanic Successions. Modern and Ancient. London: Unwin Hyman. 93–126, 269–291.Google Scholar
Casey, W. H., and Bunker, B. Leaching of mineral and glass surfaces during dissolution. In Reviews in Mineralogy, Vol. 23. Mineral- Water Interface Geochemistry. Hochella, M. F. Jr. and White, A. F., 1990 eds. Washington D.C.: Mineral. Soc. Am., 397–426.Google Scholar
Chamley, H., 1989. Clay Sedimentology. Berlin: Springer Verlag. 391–422.CrossRefGoogle Scholar
Christidis, G., 1989. Mineralogy, physical and chemical properties of the bentonite deposits of Milos Island, Greece: M.Sc. thesis. University of Hull, United Kingdom, 172 pp.Google Scholar
Christidis, G., 1992. Origin physical and chemical properties of the bentonite deposits from the Aegean Islands of Milos Kimolos and Chios: Ph.D thesis. University of Leicester, United Kingdom, 472 pp.Google Scholar
Christidis, G., and Dunham, A. C. 1993a . Compositional variations in smectites: Part I: Alteration of intermediate volcanic rocks. A case study from Milos Island, Greece. Clay Miner. 28: 255–273.CrossRefGoogle Scholar
Christidis, G., and Dunham, A. C. 1993b . Compositional variations in smectites: Part II: Alteration of acidic precursors. A case study from Milos Island, Greece. Clay Miner. (in press).CrossRefGoogle Scholar
Christidis, G., and Marcopoulos, T. 1993 . Kaolinite generating processes in the Mikos bentonites and their influence on the physical properties of bentonites. Bull. Geol. Soc. Greece (in press).Google Scholar
Dibble, W. E. Jr., and Tiller, W. 1981 . Kinetic model of zeolite paragenesis in tuffaceous sediments. Clays & Clay Miner. 29: 323–330.CrossRefGoogle Scholar
Dunham, A. C., and Wilkinson, F. C. F. 1978 . Accuracy, precision and detection limits of energy dispersive electronmicroprobe analyses of silicates. X-ray Spectrometry 7: 50–56.CrossRefGoogle Scholar
Elzea, J. M., and Murray, H. J. 1990 . Variation in the mineralogical, chemical and physical properties of the Cretaceous Clay Spur bentonite in Wyoming and Montana. Appl. Clay Sci. 5: 229–248.CrossRefGoogle Scholar
Farmer, V. C., 1974. The layer silicates. In The Infrared Spectra of Minerals. Farmer, V. C., ed. London: Mineralogical Society, 331–363.CrossRefGoogle Scholar
Farmer, V. C., and Russell, J. D. 1964 . The infrared spectra of layer silicates. Spectrochim. Acta 20: 1149–1173.CrossRefGoogle Scholar
Farmer, V. C., and Russell, J. D. 1967 . Infrared absorption spectrometry in clay studies. Clays & Clay Miner. 15: 121–142.CrossRefGoogle Scholar
Fisher, R. V., and Schmincke, H. U. 1984 . Pyroclastic Rocks. Berlin: Springer-Verlag. 472 pp.CrossRefGoogle Scholar
Fyticas, M., 1977. Geological and geothermal study of Milos Island: Ph.D. thesis. University of Thessaloniki, Greece.Google Scholar
Fyticas, M., Innocenti, F., Kolios, N., Manetti, P., Mazzuoli, R., Poli, G., Rita, F., and Villari, L., 1986. Volocanology and petrology of volcanic products from the Island of Milos and the neighbouring islets. J. Volcanol. Geotherm. Res. 28: 297–317.CrossRefGoogle Scholar
Gottardi, G., and Galli, E. 1985 . Natural Zeolites. Berlin: Springer Verlag. 409 pp.CrossRefGoogle Scholar
Govindaraju, K., 1989. Geostandards Newsletters 13: Special Issue, July 1989.Google Scholar
Grim, R. E., 1962. Applied Clay Mineralogy. New York: McGraw-Hill. 422 pp.Google Scholar
Grim, R. E., and Giiven, N. 1978 . Bentonites. New York: Elsevier. 256 pp.Google Scholar
Harben, P. W., and Bates, R. L. 1990 . Geology of the Nonmetallics. New York: Metal Bulletin Inc. 62–89.Google Scholar
Hartwell, J. M., 1965. The diverse uses of montmorillonite. Clay Miner. 6: 111–118.CrossRefGoogle Scholar
Hay, R. L., and Sheppard, R. A. Zeolites in open hydrologic systems. In Reviews in Mineralogy, Vol. 4. Mineralogy and Geology of Natural Zeolites. Mumpton, F. A., 1977 ed. Washington, D.C.: Mineral. Soc. Am., 93–102.Google Scholar
Hay, R. L., and Guldman, S. G. 1987 . Diagenetic alteration of silicic ash in Searles Lake, California. Clays & Clay Miner. 35: 449–457.CrossRefGoogle Scholar
Hemley, J. J., Hostetler, P. B., Gude, A. U., and Mountjoy, W. T. 1969 . Some stability relationships of alunite. Econ. Geol. 64: 599–611.CrossRefGoogle Scholar
Henderson, J. H., Jacson, M. L., Syers, J. K., Clayton, R. N., and Rex, R. W. 1971 . Cristobalite authigenic origin in relation to montmorillonite and quartz origin in bentonites. Clays & Clay Miner. 19: 229–238.CrossRefGoogle Scholar
Hess, P. C., 1966. Phase equilibria of some minerals in the K2O, Na2O, Al2O3, SiO2, H2O system at 25°C and 1 atmosphere. Am. J. Sci. 264: 289–309.CrossRefGoogle Scholar
Jeans, C. V., Merriman, R. J., and Mitchell, J. G. 1977 . Origin of middle Jurassic and Lower Cretaceous Fuller's earths in England. Clay Miner. 12: 11–44.CrossRefGoogle Scholar
Jones, J. B., and Segnit, E. R. 1971 . The nature of opal. I. Nomenclature and constituent phases. J. Geol. Soc. Austral. 18: 57–68.CrossRefGoogle Scholar
Kastner, M., and Siever, R. 1979 . Low temperature feldspars in sedimentary rocks. Am. J. Sci. 279: 435–479.CrossRefGoogle Scholar
Khoury, H. N., and Eberl, D. D. 1979 . Bubble-wall shards altered to montmorillonite. Clays & Clay Miner. 27: 291–292.CrossRefGoogle Scholar
Knechtel, M. M., and Patterson, S. H. 1962 . Bentonite deposits of the northern Black Hills District Wyoming, Montana and South Dakota. U. S. Geol. Surv. Bull. 1023: 115 p.Google Scholar
Knight, J. E., 1977. A thermodynamical study of alunite, enargite, luzonite and tennantite deposits. Econ. Geol. 72: 1321–1336.CrossRefGoogle Scholar
Komadel, P., Lear, R. P., and Stucki, J. W. 1990 . Reduction and reoxidation of nontronite: Extent of reduction and reaction rates. Clays & Clay Miner. 38: 203–208.CrossRefGoogle Scholar
Konta, J., 1985. Textural variation and composition of bentonite derived from basaltic ash. Clays & Clay Miner. 34: 257–265.CrossRefGoogle Scholar
Liakopoulos, A., 1991. La Genese de bentonote de Soulias (IIe de Milos, Grece): Une approche geochimique. Miner. Wealth 75: 41–47.Google Scholar
Moncure, G. K., Surdam, R. C., and McKague, H. L. 1981 . Zeolite diagenesis below Pahute Mesa, Nevada test site. Clays & Clay Miner. 29: 385–396.CrossRefGoogle Scholar
Mottl, M. J., and Holland, H. D. 1978 . Chemical exchange during hydrothermal alteration of basalt by seawater—I. Experimental results for major and minor components of seawater. Geochim. Cosmochim. Acta 42: 1103–1115.CrossRefGoogle Scholar
Patterson, S. H., and Murray, H. H. Clays. In Industrial Minerals and Rocks. Lefond, S. J., 1983 ed. New York: Am. Inst. Mining Engineers, 519–585.Google Scholar
Pevear, D. R., Williams, V. E., and Mustoe, G. E. 1980 . Kaolinite, smectite and K-rectorite in bentonite: Relation to coal rank at Tulameen, British Columbia. Clays & Clay Miner. 28: 241–254.CrossRefGoogle Scholar
Reynolds, R. C., 1989. Principles and techniques of quantitative analysis of clay minerals by X-ray powder diffraction. In CMS Workshop Lectures, Vol I. Quantitative Mineral Analysis of Clays. Pevear, D. R., and Mumpton, F. A., eds. Evergreen, Colorado: The Clay Minerals Society, 4–36.Google Scholar
Russell, J. D., 1974. Instrumentation and techniques. In The Infrared Spectra of Minerals. Farmer, V. C., ed. London: Mineralogical Society, 11–25.CrossRefGoogle Scholar
Senkayi, A. L., Dixon, J. B., Hossner, L. R., Abder-Ruhman, M., and Fanning, D. S. 1984 . Mineralogy and genetic relationships of tonstein, bentonite, and lignitic strata in the Eocene Yegua Formation of East-Central Texas. Clays & Clay Miner. 32: 259–271.CrossRefGoogle Scholar
Sheppard, R. A., and Gude, A. J., 1973 3rd. . Zeolites and associated authigenic silicate minerals in tuffaceous rocks on the Big Sandy Formation, Mohave County, Arizona. U.S. Geol. Surv. Prof. Paper No. 830: 36p.Google Scholar
Shiraki, R., and Iijama, T. 1990 . Na-K ion exchange reaction between rhyolitic glass and (Na, K) Cl solution under hydrothermal conditions. Geochim. Cosmochim. Acta 54: 2923–2931.CrossRefGoogle Scholar
Shiraki, R., Sakai, H., Endoh, M., and Kushima, N. 1987 . Experimental studies on rhyolite- and andesite-seawater interactions at 300°C and 1000 bars. Geochem. J. 21: 139–148.CrossRefGoogle Scholar
Shirozu, H., 1978. Wall rock alteration of Kuroko deposits. In Clays and Clay Minerals of Japan. Sudo, T., and Shimoda, S., eds. Amsterdam: Elsevier, 127–145.CrossRefGoogle Scholar
Smith, J. V., 1983. Some chemical properties of feldspars. In Reviews in Mineralogy, Vol. 2. Feldspar Mineralogy. Ribbe, P. H., ed. Washington, D.C: Mineral. Soc. Am., 281–296.Google Scholar
Sparks, R. S. J., Wilson, L., and Hulme, G. 1978 . Theoretical modelling of the generation, movement and emplacement of phroclastic flows by column collapse. J. Geophys. Res. 83: 1727–1739.CrossRefGoogle Scholar
Tsolis-Katagas, P., and Mavronichi, M. 1989 . Kaolinization of the Kimolos Island volcanics, Cyclades, Greece. Clay Miner. 24: 75–89.CrossRefGoogle Scholar
Utada, M., 1988. Occurrence and genesis of hydrothermal zeolites and related minerals from the Kuroko-type mineralization areas in Japan. In Occurrence, Properties and Utilization of Natural Zeolites. Kallo, D., and Sherry, H. S., eds. Budapest: Akademiai Kiado, 39–48.Google Scholar
van der Marel, H. W., and Beutelspacher, H. 1976 . Atlas of Infrared Spectroscopy of Clay Minerals and Their Admixtures. Amsterdam: Elsevier.Google Scholar
Weaver, C. E., 1989. Clays, Muds and Shales. Developments in Sedimentology 44: Elsevier, Amsterdam.Google Scholar
Wetzenstein, W., 1969. Die Bentonitlagerstatten im Osteil der Insel Milos/Griechenland und ihre mineralogische Zussamensetzung: Ph.D. thesis. University of Stuttgart, Germany.Google Scholar
White, A. F., and Claasen, H. C. 1980 . Kinetic model for the short-term dissolution of a rhyolitic glass. Chem. Geol. 28: 91–109.CrossRefGoogle Scholar
White, A. F., 1983. Surface chemistry and dissolution kinetics of glassy rocks at 25°C. Geochim. Cosmochim. Acta 47: 805–815.CrossRefGoogle Scholar
Wilson, M. J., Russell, J. D., and Tait, J. M. 1974 . A new interpretation of the strucutre of disordered a-cristobalite. Contrib. Mineral. Petrol. 47: 1–6.CrossRefGoogle Scholar
Winchester, J. A., and Floyd, P. A. 1977 . Geochemical discrimination of different magma series and their differentiation products using immobile elements. Chem. Geol. 20: 325–343.CrossRefGoogle Scholar
Wright, T. L., 1968. W-ray and optical study of alkali feldspar: II. An X-ray method determining the composition and structural state from measurement of 2q values for three reflections. Amer. Miner. 53: 88–104.Google Scholar