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Sedimentology, genetic stratigraphy and depositional environment of the Permo-Triassic succession in the Southern Sydney Basin, Australia
| Content Provider | Semantic Scholar |
|---|---|
| Author | Dehghani, Mohammad Hossein |
| Copyright Year | 1994 |
| Abstract | The Late Permian to Middle Triassic Narrabeen Group succession is mostly composed of fluviatile deposits and was deposited in the retro-arc foreland Sydney Basin, Australia. Two major sources were present: the New England Magmatic Belt towards the north and the Lachlan Fold Belt in the west. Detailed outcrop, borehole and laboratory studies, using the concepts of sequence stratigraphy and genetic relationships between the strata, were used to study the lithofacies in detail and delineate depositional sequences, depositional complexes and depositional systems. Three depositional sequences are recognised. The maJor part of the studied succession belongs to the Narrabeen depositional sequence. However, the lowermost and uppermost depositional systems belong to the Illawarra depositional sequence and Hawkesbury depositional sequence respectively. The basin-wide erosional surface at the base of the Scarborough depositional system is considered to be the lower boundary of the Narrabeen depositional sequence and upper boundary of the Illawarra depositional sequence. The hiatal surface at the top of the Bald Hill Claystone marks upper boundary of the N arrabeen depositional sequence and lower boundary of the Hawkesbury depositional sequence. Based on detailed lithofacies and bounding surfaces analysis, architectural element studies and palaeohydrology, one depositional complex and six depositional systems are recognised. In an ascending stratigraphic order, they are: the Wombarra depositional system including mixed-load fluvial deposit A (Coal Cliff Sandstone Member), bed-load fluvial deposit A (Otford Sandstone Member) and floodplain deposit A (Wombarra Shale); Scarborough depositional system including bed-load fluvial deposit B (Scarborough Sandstone) and floodplain deposit B (Stanwell Park Claystone ); Bulgo depositional complex including bed-load fluvial deposit C (lower Bulgo Sandstone), braidplain fluvial deposit (middle Bulgo Sandstone), mixed-load fluvial deposit B (upper Bulgo Sandstone) and floodplain deposit C (Bald Hill Claystone ); and Newport depositional system including Garie Claystone Member (a tuffaceous unit) and lagoonal to lacustrine deposits (Newport |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://ro.uow.edu.au/cgi/viewcontent.cgi?article=2406&context=theses&httpsredir=1&referer= |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
