Fluvial response to late Quaternary climate change in NE Queensland, Australia

Thomas, Michael F., Nott, Jonathan, Murray, Andrew S., and Price, David M. (2007) Fluvial response to late Quaternary climate change in NE Queensland, Australia. Palaeogeography, Palaeoclimatology, Palaeoecology, 251 (1). pp. 119-136.

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Abstract

Samples of alluvial and colluvial deposits from the coastal plain and coastal valleys north and south of Cairns (17°S) have been dated using optically stimulated luminescence (OSL) protocols, with additional thermoluminescence (TL) and Radiocarbon assays. Coarse fanglomerates from elevated coastal terraces date back to 81 ka, but most are clustered in oxygen isotope stage three (OIS3, 64–28 ka), indicating high-energy conditions during this period. Extensive fans and terraces of finer calibre sediments are widely represented grading from coarse gravels and cobbles in proximal zones fine sand and silt in distal areas. Dates show that vertical accumulation of 10–15 m of sediment occurred between not, vert, similar 28 and 14 ka (OIS2), after which the fans were dissected and Holocene deposits become fragmentary. A number of deposits indicating hillslope instability were successfully dated and these fall mainly into OIS3 and post 12 ka. These results are interpreted as catchment responses to Late Pleistocene climate and vegetation changes, documented elsewhere from local pollen and ocean drilling sites. Correlation with these records and with evidence for regional climate change from the Austral-Asian region is good and indicates that these changes were sufficient to transform fluvial activity and slope processes.

Item ID: 2510
Item Type: Article (Refereed Research - C1)
Keywords: late Quaternary environments; humid tropics; debris flows; alluvial fans; Queensland geomorphology
ISSN: 1872-616X
Date Deposited: 06 May 2009 04:58
FoR Codes: 04 EARTH SCIENCES > 0499 Other Earth Sciences > 049999 Earth Sciences not elsewhere classified @ 50%
04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040601 Geomorphology and Regolith and Landscape Evolution @ 50%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960399 Climate and Climate Change not elsewhere classified @ 100%
Citation Count from Web of Science Web of Science 11
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