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Occurrence of Spherical Halloysite in Bituminous Coals of the Sydney Basin, Australia

Published online by Cambridge University Press:  02 April 2024

Colin R. Ward  and
F. Ivor Roberts
Colin R. Ward
Affiliation:
Department of Applied Geology, University of New South Wales, P.O. Box 1, Kensington, New South Wales, 2033 Australia
F. Ivor Roberts
Affiliation:
Department of Applied Geology, University of New South Wales, P.O. Box 1, Kensington, New South Wales, 2033 Australia
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Abstract

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Spherical halloysite aggregates have been identified for the first time in mineral matter isolated from bituminous coals. The spherules, found in Permian coals of the Sydney basin, New South Wales, range from 0.4 to 0.6 µm in diameter and have a delicate ring-like structure that helps to confirm the halloysite identification. They appear from their location to be related to influxes of pyroclastic debris, either directly or from nearby soils, into the original peat accumulation. Analytical electron microscopy indicates higher proportions of Si and Fe than coexisting particles of hexagonal platy kaolinite, and electron diffraction reveals a typical disordered halloysite structure. The aggregates are larger than those normally reported in soils, and comparison to growth rates in soils suggests development over a significantly longer time than that expected for accumulation of the host coal seams. The buckled structure in the ring-like pattern and the related crude polyhedral outlines probably reflect shrinkage with dehydration during the coalification process, but it may also be due to the different sample preparation techniques.

Keywords

CoalEnergy-dispersive X-ray spectroscopyHalloysiteMorphologySphereTransmission electron microscopy
Type
Research Article
Information
Clays and Clay Minerals , Volume 38 , Issue 5 , October 1990 , pp. 501 - 506
Copyright
Copyright © 1990, The Clay Minerals Society

References

Aomine, S. and Wada, K., 1962 Differential weathering of volcanic ash and pumice, resulting in formation of hydrated halloysite Amer. Mineral. 47 1024 – 1048.Google Scholar
Brindley, G. W. and De Kimpe, C., 1961 Identification of clay minerals by single crystal electron diffraction Amer. Mineral. 46 1005 – 1016.Google Scholar
Glasmann, J. R., 1982 Alteration of andésite in wet, unstable soils of Oregon’s Western Cascades Clays & Clay Minerals 30 253 – 263.CrossRefGoogle Scholar
Gluskoter, H. J., 1965 Electronic low-temperature ashing of bituminous coal Fuel (Lond.) 44 285 – 291.Google Scholar
Holmes, G. G. (1983) Bentonite and fullers earth in New South Wales: Geol. Surv. New South Wales, Mineral Resources 45, 138 pp.Google Scholar
Hood, A., Gutjahr, C. C. M. and Heacock, R. L., 1975 Organic metamorphism and the generation of petroleum Bull. Amer. Assoc. Petrol. Geol. 59 986 – 996.Google Scholar
Hunt, J. W. and Hobday, D. K., 1984 Pétrographie composition and sulphur content of coals associated with alluvial fans in the Permian of the Sydney and Gunnedah Basins, eastern Australia Sedimentology of Coal and Coal-bearing Sequences 7 43 – 60.Google Scholar
Kirkman, J. H., 1981 Morphology and structure of halloysite in New Zealand tephras Clays & Clay Minerals 29 1 – 9.CrossRefGoogle Scholar
Kohyama, N., Fukushima, K. and Fukami, A., 1978 Observation of the hydrated form of tubular halloysite by an electron microscope equipped with an environmental cell Clays & Clay Minerals 26 25 – 40.CrossRefGoogle Scholar
Kohyama, N., Fukushima, K., Fukami, A., van Olphen, H. and Veniale, F., 1982 In-terlayer hydrates and complexes of clay minerals observed by electron microscopy using an environmental cell Proc. Int. Clay Conf., Bologna, Pavia, 1981 Amsterdam Elsevier 373 – 384.Google Scholar
Loughnan, F. C. and Craig, D. C., 1961 A complex inter-stratified clay mineral in the pottery shale from Marran-garoo, N.S.W. Aust. J. Sci. 23 379.Google Scholar
Nagasawa, K., Miyazaki, S. and Bailey, S. W., 1976 Mineralogical properties of halloysite as related to its genesis Proc. Int. Clay Conf. 1975 Wilmette, Illinois Applied Publications Ltd. 257 – 265.Google Scholar
Roberts, F. I. and Loughnan, F. C., 1989 Mineralogy and economic significance of the bentonite occurrences in the upper Hunter Valley Proc. Mineralogy-Petrology Symposium, Sydney, 1989 Melbourne Australasian Inst. Min. Metall. 123 – 127.Google Scholar
Stach, E., Mackowsky, M Th Teichmüller, M., Taylor, G. H., Chandra, D. and Teichmüller, R., 1982 Stach’s Text-book of Coal Petrology 3rd Stuttgart Gebrüder Bornträger.Google Scholar
Sudo, T., Shimoda, S., Yotsumoto, H. and Aita, S., 1981 Electron Micrographs of Clay Minerals Amsterdam Elsevier.Google Scholar
Sudo, T. and Yotsumoto, H., 1977 The formation of hal-loysite tubes from spherulitic halloysite Clays & Clay Minerals 25 155 – 159.CrossRefGoogle Scholar
Tazaki, K., van Olphen, H. and Veniale, F., 1982 Analytical electron microscopic studies of halloysite formation processes—Morphology and composition of halloysite Proc. Int. Clay Conf, Bologna, Pavia, 1981 Amsterdam Elsevier 573 – 584.Google Scholar
Tomura, S., Shibasaki, Y., Mizuta, H. and Kitamura, M., 1983 Spherical kaolinite: synthesis and mineralogical properties Clays & Clay Minerals 31 413 – 421.CrossRefGoogle Scholar
Wada, K., 1987 Minerals formed and mineral formation from volcanic ash by weathering Chem. Geol. 60 17 – 28.CrossRefGoogle Scholar
Ward, C. R., 1978 Mineral matter in Australian bituminous coals Proc. Australasian Inst. Min. Metall. 267 7 – 25.Google Scholar
Ward, C. R., 1989 Minerals in bituminous coals of the Sydney basin (Australia) and the Illinois basin (U.S.A.) Coal: Classification, Coalification, Mineralogy, Trace Element Geochemistry, and Oil and Gas Potential 13 455 – 479.CrossRefGoogle Scholar
Ward, C. R., Warbrooke, P. R. and Roberts, F. I., 1989 Geochemical and mineralogical changes in a coal seam due to contact metamorphism, Sydney basin, New South Wales, Australia Int. J. Coal Geol. 11 105 – 125.CrossRefGoogle Scholar