A 100 ka record of fluvial activity in the Fitzroy River Basin, tropical northeastern Australia

Croke, Jacky, Jansen, John D., Amos, Kathryn and Pietsch, Timothy J. (2011) A 100 ka record of fluvial activity in the Fitzroy River Basin, tropical northeastern Australia. Quaternary Science Reviews, 30 13-14: 1681-1695. doi:10.1016/j.quascirev.2011.03.012


Author Croke, Jacky
Jansen, John D.
Amos, Kathryn
Pietsch, Timothy J.
Title A 100 ka record of fluvial activity in the Fitzroy River Basin, tropical northeastern Australia
Journal name Quaternary Science Reviews   Check publisher's open access policy
ISSN 0277-3791
1873-457X
Publication date 2011-06-01
Sub-type Article (original research)
DOI 10.1016/j.quascirev.2011.03.012
Volume 30
Issue 13-14
Start page 1681
End page 1695
Total pages 15
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Formatted abstract
This study reports the nature and timing of Quaternary fluvial activity in the Fitzroy River basin, which drains a diverse 143,000 km2 area in northeastern Queensland, before discharging into the Great Barrier Reef Marine Park. The catchment consists of an extensive array of channel and floodplain types that we show have undergone large-scale fluvial adjustment in-channel planform, geometry and sinuosity. Optically stimulated luminescence (OSL) dating of quartz sediments from fifteen (3–18 m) floodplain cores throughout the basin indicates several discrete phases of active bedload activity: at ~105–85 ka in Marine Isotope Stage (MIS) 5, at ~50–40 ka (MIS 3), and at ~30–10 ka (MIS 3/2). The overall timing of late Quaternary fluvial activity correlates well with previous accounts from across Australia with rivers being primarily active during interstadials. Fluvial activity, however, does not appear to have been synchronous throughout the basin’s major sub-catchments. Fluvial activity throughout MIS 2 (i.e. across the Last Glacial Maximum) in the meandering channels of the Fitzroy correlates well with regional data in tropical northeastern Queensland, and casts new light on the river response to reduced rainfall and vegetation cover suggested by regional palaeoclimate indicators. Moreover, the absence of a strong Holocene signal is at odds with previous accounts from elsewhere throughout Australia. The latitudinal position of the Fitzroy across the Tropic of Capricorn places this catchment at a key location for elucidating the main hydrological drivers of Quaternary fluvial activity in northeastern Australia, and especially for determining tropical moisture sources feeding into the headwaters of Cooper Creek, a major river system of the continental interior.
Keyword Quaternary fluvial change
Optically stimulated luminescence
Floodplains
Tropical
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
 
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Created: Wed, 26 Nov 2014, 23:48:33 EST by Helen Smith on behalf of School of Geography, Planning & Env Management