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https://hdl.handle.net/2440/60832
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Type: | Journal article |
Title: | Loess and floods: High-resolution multi-proxy data of Last Glacial Maximum (LGM) slackwater deposition in the Flinders Ranges, semi-arid South Australia |
Author: | Haberlah, D. Williams, M. Halverson, G. McTainsh, G. Hill, S. Hrstka, T. Jaime, P. Butcher, A. Glasby, P. |
Citation: | Quaternary Science Reviews: the international multidisciplinary research and review journal, 2010; 29(19-20):2673-2693 |
Publisher: | Pergamon-Elsevier Science Ltd |
Issue Date: | 2010 |
ISSN: | 0277-3791 1873-457X |
Statement of Responsibility: | David Haberlah, Martin A.J. Williams, Galen Halverson, Grant H. McTainsh, Steven M. Hill, Tomas Hrstka, Patricio Jaime, Alan R. Butcher and Peter Glasby |
Abstract: | Terrace remnants of late Pleistocene fine-grained valley-fill deposits (Silts) deeply entrenched by ephemeral traction load streams in arid areas remain a puzzle. They have been attributed to a variety of origins ranging from lacustrine to alluvial floodplains. We here report a centimetre-scale multi-proxy study of a 7 m section of Silts in the semi-arid Flinders Ranges of South Australia, which span the lead-up to and peak of the Last Glacial Maximum (LGM). The results of detailed lithostratigraphic mapping, high-resolution parametric particle-size analysis, Automated Mineralogy, induced magnetic susceptibility, carbon stable isotope geochemistry, and a chronostratigraphy based on 27 AMS radiocarbon and 6 luminescence ages are discussed in terms of sediment provenance, depositional environment and weathering history with the aim of reconstructing the regional palaeo-environment. The data are consistent with a fluctuating aeolian-fluvial interplay dominating the extended LGM environment with a greater impact on the landscape than all combined geomorphic processes since then. Accordingly, weathered slope mantles and loess accessions were eroded and entrained by numerous small and at least a dozen large-scale flood events, and trapped in an intra-montane floodplain extending into Brachina Gorge. Upstream of this narrow constriction, recurrent backflooding is discussed resulting in a thick sequence of layered to laminated slackwater couplets. Aggradation and degradation of valley-fills appear to be largely controlled by fine-sediment supply from the valley slopes, replenished by wind-blown dust from upwind playa lakes and source-bordering dunefields. In conclusion, this study demonstrates how dust storms and flooding rains can account for 'pluvial' features previously explained by the opposing effects of reduced precipitation and evaporation in the colder more arid glacial landscape of southern Australia. © 2010 Elsevier Ltd. |
Rights: | Copyright © 2010 Elsevier Ltd. All rights reserved. |
DOI: | 10.1016/j.quascirev.2010.04.014 |
Grant ID: | http://purl.org/au-research/grants/arc/DP0559577 |
Published version: | http://dx.doi.org/10.1016/j.quascirev.2010.04.014 |
Appears in Collections: | Aurora harvest Earth and Environmental Sciences publications Environment Institute publications |
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