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| Titel: |
Dickite- and kaolinite-bearing sandstones and conglomerates in Illawarra Coal Measures of the Sydney Basin, New South Wales |
| Auteur: |
Loughnan, F. C. Roberts, F. I. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 33 (1986) nr. 3 pagina's 325-332 |
| Jaar: |
1986-09 |
| Inhoud: |
The recent discovery of dickite, intimately associated with ordered and disordered kaolinite, in quartzose sandstones and conglomerates of the Illawarra Coal Measures is of interest since in terms of the phase rule the co-existence of two or more of these polytypes is evidence of either an unstable or metastable assemblage. A study has, therefore, been undertaken of the host rocks and accompanying strata in an attempt to gain insight into the mechanism of formation of the dickite and the reason for its development in preference to either of the other generally more abundant polytypes. From the results it would appear that although much still remains unresolved, the dickite is authigenic and precipitated from migrating groundwaters. Due probably to unusually low concentrations of silica in the groundwaters the rate of precipitation was inordinately slow and this apparently facilitated growth of relatively coarse crystals and development of the most stable phase. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 2 van 13 gevonden artikelen
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