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| Titel: |
Genetic stratigraphy of the Gunnedah Basin, NSW |
| Auteur: |
Hamilton, D.S. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 38 (1991) nr. 1 pagina's 95-113 |
| Jaar: |
1991-02 |
| Inhoud: |
A genetic approach to stratigraphic analysis which recognizes clastic sediments as facies components of sedimentary basins was applied to the Permo-Triassic Gunnedah Basin sequence. The genetic units of widespread correlatability are unified by a common origin and deposited during discrete episodes of genera! tectonic, climatic and/or base level stability. Such units are the fundamental time stratigraphic increments of the basin-fill and form the most logical basis for lithostratigraphic subdivision. Six depositional episodes and their stratigraphic products, the depositional systems, are recognized from detailed analysis of drill core and geophysical well logs within the Gunnedah Basin. Contrasts of regional extent in the gamma and neutron logs proved essential to the delineation of the depositional systems. The onset of sedimentation in the basin is recorded by alluvial and lacustrine deposition of the Leard-Maules Creek alluvial/lacustrine system. The basin was then inundated by a regional transgression during which the Porcupine-lower Watermark marine shelf system was deposited and together these strata comprise the Leard-Maules Creek/Porcupine-lower Watermark depositional episode. Progradation of the upper Watermark-lower Black Jack delta systems and overlying transgressive facies of the Arkarula shallow marine system represent the second depositional episode of basin history. Widespread peat accumulation in the Hoskissons depositional episode followed termination of marine conditions, and alluvial and lacustrine systems again interfingered across the broad diameter of the basin during the succeeding upper Black Jack depositional episode. Triassic sedimentation was characterized initially by widespread coarse alluvial clastics of the Digby depositional episode, followed by regional inundation by the Napperby lacustrine system which recorded the final episode of deposition in the basin. The genetic stratigraphic framework will have wide application to exploration and development of the basin's extensive coal deposits and potential, but undiscovered, petroleum resources. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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