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Weathering of Chlorite in a Quartz-Chlorite Schist: I. Mineralogical and Chemical Changes

Published online by Cambridge University Press:  28 February 2024

Takashi Murakami ,
Hiroshi Isobe ,
Tsutomu Sato  and
Toshihiko Ohnuki
Takashi Murakami*
Affiliation:
Department of Earth Sciences, Faculty of Science, Ehime University, Matsuyama, Ehime 790, Japan
Hiroshi Isobe
Affiliation:
Department of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai. Ibaraki 319-11, Japan
Tsutomu Sato
Affiliation:
Department of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai. Ibaraki 319-11, Japan
Toshihiko Ohnuki
Affiliation:
Department of Environmental Safety Research, Japan Atomic Energy Research Institute, Tokai. Ibaraki 319-11, Japan
*
†Present address: Mineralogical Institute, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan
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Abstract

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The weathering of chlorite, one of the major minerals of the host rock in the uranium ore deposit at Koongarra, Australia, was examined by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), electron microprobe analysis, and transmission electron microscopy (TEM). The conversion sequence of chlorite weathering is: (1) chlorite; (2) chlorite/vermiculite intergrade (showing XRD responses to various treatments intermediate between those of chlorite and vermiculite); (3) interstratified chlorite and vermiculite; (4) vermiculite; and (5) kaolinite. This sequence may be more simply expressed as chlorite ⤒ vermiculite ⤒ kaolinite. The weathering finally changed chlorite into sub-micrometer to micrometer sized Fe minerals and kaolinite. The transformation of chlorite to vermiculite is chemically characterized by an Fe and Mg loss with a slight decrease in the Al/Si ratio. Mg continues to be released throughout the weathering. Fe minerals formed through chlorite weathering are located between chlorite and vermiculite domains (a few μm in size) at first, and then accumulated between grain boundaries, occasionally forming veins. The distribution of Fe minerals is suggestive of preferential pathways of water movement. The time-dependent nature of mineral alteration demonstrated in the present study must be taken into account for the quantitative estimation of radionuclide migration.

Keywords

AlterationChloriteKaoliniteUranium Ore DepositVermiculiteWeathering
Type
Research Article
Information
Clays and Clay Minerals , Volume 44 , Issue 2 , April 1996 , pp. 244 - 256
Copyright
Copyright © 1996, The Clay Minerals Society

References

Airey, P.L.. 1985. Radionuclide migration around uranium ore bodies—Analogue of radioactive waste repositories. Annual Report 1983-1984, AAEC/C45. United States Nuclear Regulatory Commission Contract NRC-04-81-172. Sydney: Australian Nuclear Science and Technology Organisation. 142p.Google Scholar
Airey, P.L.. 1986. Radionuclide migration around uranium ore bodies in the Alligator Rivers Region of the Northern Territory of Australia—Analogue of radioactive waste repositories—a review. Chem Geol 55: 255–268.CrossRefGoogle Scholar
Airey, P.L., Golian, C. and Lever, D.A.. 1986. An approach to the mathematical modelling of the uranium series redistribution within ore bodies. Topical Report AAEC/C49. Sydney: Australian Nuclear Science and Technology Organisation. 106p.Google Scholar
Airey, P.L. and Ivanovich, M.. 1986. Geochemical analogues of high-level radioactive waste repositories. Chem Geol 55: 203–213.CrossRefGoogle Scholar
Buurman, P., Meijer, E.L. and van Wijck, J.H.. 1988. Weathering of chlorite and vermiculite in ultramafic rocks of Cabo Ortegal, northwestern Spain. Clays & Clay Miner 36: 263–269.CrossRefGoogle Scholar
Dibble, W.E. Jr and Tiller, W.A.. 1981. Kinetic model of zeolite paragenesis in tuffaceous sediments. Clays & Clay Miner 29: 323–330.CrossRefGoogle Scholar
Edis, R., Cao, L., Cashion, J., Klessa, D., Koppi, A.J., Murakami, T., Nightingale, T., Payne, T., Snelling, A. and Yanase, N.. 1992. Chemistry and mineralogy of rocks and soils, Alligator Rivers Analogue Project Final Report Vol. 8. Sydney: Australian Nuclear Science and Technology Organisation. DOE/HMIP/PR/92/078. 255p.Google Scholar
Eggleton, R.A. and Banfield, J.F.. 1985. The alteration of granitic biotite to chlorite. Am Mineral 70: 902–910.Google Scholar
Foster, M.D.. 1953. Geochemical studies of clay minerals. II. Relation between ionic substitution and swelling in montmorillonite. Am Mineral 38: 994–1006.Google Scholar
Gilkes, R.J. and Little, I.P.. 1972. Weathering of chlorite and some associations of trace elements in Permian phyllites in southeast Queensland. Geoderma 7: 233–247.CrossRefGoogle Scholar
Herbillon, A.J. and Makumbi, M.N.. 1975. Weathering of chlorite in a soil derived from a chlorite-schist under humid tropical conditions. Geoderma 13: 89–104.CrossRefGoogle Scholar
Iijima, S. and Buseck, P.R.. 1978. Experimental study of disordered mica structures by high-resolution electron microscopy. Acta Crystal A34: 709–719.Google Scholar
Johnson, L.J.. 1964. Occurrence of regularly interstratified chlorite-vermiculite as a weathering product of chlorite in a soil. Am Mineral 49: 556–572.Google Scholar
Kakinoki, J. and Komura, Y.. 1952. Intensity of X-ray by a one-dimensionally disordered crystal. J Phys Soc Japan 7: 30–35.CrossRefGoogle Scholar
Murakami, T., Isobe, H. and Edis, R.. 1991a. Effects of chlorite alteration on uranium redistribution in Koongarra, Australia. In: Abrajano, T. Jr, Johnson, L.H., editors. Mat Res Soc Symp Proc (Scientific Basis for Nuclear Waste Management XIV). Pittsburgh, PA: The Materials Research Society. 212: 741–748.Google Scholar
Murakami, T., Isobe, H., Nagano, T. and Nakashima, S.. 1992. Uranium redistribution and fixation during chlorite alteration at Koongarra, Australia. In: Sombret, C.G., editor. Mat Res Soc Symp Proc (Scientific Basis for Nuclear Waste Management XV). Pittsburgh, PA: The Materials Research Society. 257: 473–480.Google Scholar
Murakami, T. and Kimura, H.. 1993. A modelling study of the effect of rock alteration on the redistribution of uranium. In: Interrante, C.G., Pabalan, R.T., editors. Mat Res Soc Symp Proc (Scientific Basis for Nuclear Waste Management XVI). Pittsburgh, PA: The Materials Research Society. 294: 535–542.Google Scholar
Murakami, T., Ohnuki, T. and Sato, T.. 1991b. Kinetic analysis of chlorite alteration. Abstracts for Fall Meeting of Mineralogical Society of Japan. Japan: Sendai. p. 50.Google Scholar
Newman, A.C.D. and Brown, G.. 1987. The chemical constitution of clays. In: Newman, A.C.D., editor. Chemistry of Clays and Clay Minerals. Essex, UK: Longman Scientific & Technical. 1–128.Google Scholar
Ohnuki, T., Watanabe, S. and Murakami, T.. 1991. Study on role of Th-234 in uranium series nuclides migration. In: Abrajano, T. Jr, Johnson, L.H., editors. Mat Res Soc Symp Proc (Scientific Basis for Nuclear Waste Management XIV). Pittsburgh, PA: The Materials Research Society. 212: 733–740.Google Scholar
Ohnuki, T., Murakami, T. and Yanase, N.. 1993. A modelling study on the fractionation of uranium between minerals by rock alteration. In: Interrante, C.G., Pabalan, R.T., editors. Mat Res Soc Symp Proc (Scientific Basis for Nuclear Waste Management XVI). Pittsburgh, PA: The Materials Research Society. 294: 527–533.Google Scholar
Page, R.W., Compston, W. and Needham, R.S.. 1980. Geochronology and evolution of the late-Archaean basement and Proterozoic rocks in the Alligator Rivers uranium field, Northern Territory, Australia. In: Ferguson, J., Goleby, A.B., editors. Proceedings of the IAEA International Uranium Symposium in the Pine Creek Geosyncline. Vienna: IAEA. 39–68.Google Scholar
Payne, T., Edis, R., Herczeg, A., Sekine, K., Seo, T., Waite, D. and Yanase, N.. 1992. Groundwater chemistry, Alligator Rivers Analogue Project Final Report. 7. Sydney: Australian Nuclear Science and Technology Organisation. DOE/HMIP/PR/92/077. 185p.Google Scholar
Proust, D.. 1982. Supergene alteration of metamorphic chlorite in an amphibolite from Massif Central, France. Clay Mineral 17: 159–173.CrossRefGoogle Scholar
Proust, D., Dudoignon, P., Bouchet, A. and Meunier, A.. 1987. Marine and supergene alteration progresses in a chloritized amphibole-schist, Deux-Serves, France. Clay Mineral 22: 129–143.CrossRefGoogle Scholar
Proust, D., Eymery, J.-P. and Beaufort, D.. 1986. Supergene vermi-culitization of a magnesian chlorite: iron and magnesium removal processes. Clays & Clay Miner 34: 572–580.CrossRefGoogle Scholar
Ross, G.J.. 1975. Experimental alteration of chlorites into vermiculites by chemical oxidation. Nature 255: 133–134.CrossRefGoogle Scholar
Ross, G.J. and Kodama, H.. 1976. Experimental alteration of a chlorite into a regularly interstratified chlorite-vermiculite by chemical oxidation. Clays & Clay Miner 24: 183–190.CrossRefGoogle Scholar
Ross, G.J., Wang, C., Ozken, A.I. and Rees, H.W.. 1982. Weathering of chlorite and mica in a New Brunswick podzol developed on till derived from chlorite-mica schist. Geoderma 27: 255–267.CrossRefGoogle Scholar
Snelling, A.A.. 1980. Uraninite and its alteration products, Koongarra uranium deposit. In: Ferguson, J., Goleby, A.B., editors. Proceedings of the IAEA International Symposium Uranium in the Pine Creek Geosyncline. Vienna: IAEA. 487–498.Google Scholar
Snelling, A.A.. 1992. Geologic setting: Alligator Rivers Analogue Project Final Report. Vol. 2. Sydney: Australian Nuclear Science and Technology Organisation. DOE/HMIP/PR/92/072. 118p.Google Scholar
Suquet, H., Iiyama, J.T., Kodama, H. and Pezerat, H.. 1977. Synthesis and swelling properties of saponites with increasing layer charge. Clays & Clay Miner 25: 231–242.CrossRefGoogle Scholar
Veblen, D.R.. 1983. Microstructure and mixed layering in intergrown wonesite, chlorite, talc, biotite, and kaolinite. Am Mineral 68: 566–580.Google Scholar
Watanabe, T., Nakamuta, Y. and Shirozu, H.. 1974. An interstratified mineral of chlorite and saponite from the Wanibuchi mine. J Mineral Soc Jpn 11: 123–130 (in Japanese).Google Scholar
Weir, A.H.. 1965. Potassium retention in montmorillonite. Clay Miner 6: 17–22.CrossRefGoogle Scholar
Wilson, M.J.. 1987. X-ray powder diffraction methods. In: Wilson, M.J., editor. A Handbook of Determinative Methods in Clay Mineralogy. New York: Chapman and Hall. 26–98.Google Scholar