Please use this identifier to cite or link to this item: https://apo.ansto.gov.au/dspace/handle/10238/12465
Title: Late Quaternary landscape evolution in the Keep River region, northwestern Australia
Authors: Ward, IAK
Nanson, GC
Head, LM
Fullagar, R
Price, DM
Fink, D
Keywords: Australia
Northern Territory
Archaeological sites
Sediments
Erosion
Sands
Alluvial deposits
Quaternary period
Issue Date: Sep-2005
Publisher: Elsevier
Citation: Ward, I. A. K., Nanson, G. C., Head, L. M., Fullagar, R. L. K., Price, D. M., & Fink, D. (2005). Late Quaternary landscape evolution in the Keep River region, northwestern Australia. Quaternary Science Reviews, 24(16–17), 1906-1922. doi:10.1016/j.quascirev.2004.11.004
Abstract: This paper evaluates the Late Quaternary chronostratigraphic context of archaeological sites in the Keep River region, Northern Territory, Australia. Cosmogenic dating, luminescence dating and sediment characterisation reveal sedimentary processes commencing from erosion of the escarpment and plateaux source through temporary storage in sand sheets, to final deposition in alluvial floodplains. Erosion of the sandstone plateaux (∼5 mm ka−1) and escarpment faces (probably ∼50–100 mm ka−1) provide the main sediment source for the adjacent sand sheets which have evolved over the past 100,000 years as the product of ongoing cycles of accumulation and denudation. The rate of sediment accumulation is lowest near the escarpments on the low-energy sediment-limited sand sheets (<100 mm ka−1) and greatest near the main streams (>400 mm ka−1) that have more numerous sediment sources. Collectively, luminescence ages indicate an apparent increase in sediment accumulation rate in the sand sheets from ∼100 mm ka−1 in the late Pleistocene to over 200 mm ka−1 in the Holocene. This most likely reflects enhanced monsoonal activity following postglacial marine transgression. Palaeosol horizons in the creek profile distinguished by sediment mottling mark potentially significant palaeoenvironmental and palaeoclimatic changes during the Quaternary. © 2004 Elsevier Ltd.
URI: https://doi.org/10.1016/j.quascirev.2004.11.004
https://apo.ansto.gov.au/dspace/handle/10238/12465
ISSN: 0277-3791
Appears in Collections:Journal Articles

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