Nature and origin of the submarine Albany canyons off southwest Australia
| Autor: | A Post, PJ Hill, Cameron Mitchell, Neville F. Exon |
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| Rok vydání: | 2005 |
| Předmět: | |
| Zdroj: | Australian Journal of Earth Sciences. 52:101-115 |
| ISSN: | 1440-0952 0812-0099 |
| DOI: | 10.1080/08120090500100036 |
| Popis: | The Albany canyons complex off southwest Australia extends 700 km from Cape Leeuwin to east of Esperance. The submarine canyons head on the uppermost continental slope and extend from there up to 90 km offshore, to the lowermost slope and onto the abyssal plain. Distributaries have transported shelf carbonate grains at least 150 km onto the abyssal plain. The largest canyons have cut down 1500 – 2000 m in places. In general, on the upper slope they have cut down into harder, older rocks: canyon walls are steep, canyon axes slope at up to 20°, and ancient structures control their orientation. On the lower slope the canyons generally have not eroded down into harder rocks: canyon walls are less steep, canyon axis slopes are lower, and the canyons are generally oriented downslope. The canyons have exposed Jurassic and younger sedimentary rocks: their nature, canyon morphology and information from seismic reflection profiles have helped us build an understanding of canyon history. Floodplain deposition rather... |
| Databáze: | OpenAIRE |
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