Micrinite in Southern Hemisphere sub-bituminous and bituminous coals : redefined as fine grained kaolinite

Faraj, Basim S. M. & Mackinnon, Ian D. R. (1993) Micrinite in Southern Hemisphere sub-bituminous and bituminous coals : redefined as fine grained kaolinite. Organic Geochemistry, 20(6), pp. 823-841.

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Abstract

A range of complementary analytical techniques including SEM/EDS, TEM/EDS and conventional optical microscopy has been rigorously applied to precisely defined areas of micrinite in polished coal samples from Australia and New Zealand. Elemental analyses of micrinite regions showed a high abundance of Al, Si and O and high resolution images of micrinite revealed a grain size < 1μm. Electron diffraction and elemental analyses from individual grains within the optically and electron-optically correlated micrinite regions are consistent with the occurence of fine-grained kaolinite. The optical properties of "dark clay" and "micrinite" (i.e. fine-grained kaolinite) can be understood in terms of the diffuse scattering of visible light from the surfaces of materials with different grain sizes in single-phase or multi-phase mixtures.

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6 citations in Web of Science®

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ID Code: 55697
Item Type: Journal Article
Refereed: Yes
Additional Information: GeoRef, Copyright 2009, American Geological Institute.
1993-041809
Keywords: bituminous coal, clay minerals, coal, exinite, grain size, inertinite, kaolinite, macerals, micrinite, optical properties, organic residues, reflectance, sedimentary rocks, SEM data, sheet silicates, Southern Hemisphere, subbituminous coal, TEM data, vitrinite
DOI: 10.1016/0146-6380(93)90066-K
ISSN: 0146-6380
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOCHEMISTRY (040200) > Organic Geochemistry (040204)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Petroleum and Coal Geology (040309)
Divisions: Current > Institutes > Institute for Future Environments
Deposited On: 31 Jan 2013 06:17
Last Modified: 31 Jan 2013 06:17

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