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  • Holocene lake salinity changes in the Wimmera, southeastern Australia, provide evidence for millennial-scale climate variability

    Author(s)
    Kemp, Justine
    Radke, Lynda C
    Olley, Jon
    Juggins, Steve
    De Deckker, Patrick
    Griffith University Author(s)
    Olley, Jon M.
    Kemp, Justine
    Year published
    2012
    Metadata
    Show full item record
    Abstract
    Palaeosalinity records for groundwater-influenced lakes in the southwest Murray Basin were constructed from an ostracod-based, weighted-averaging transfer function, supplemented with evidence from Campylodiscus clypeus (diatom), charophyte oogonia, Coxiella striata (gastropod), Elphidium sp. (foraminifera), Daphniopsis sp. ephippia (Cladocera), and brine shrimp (Parartemia zietziana) faecal pellets, the d18O of ostracods, and > 130 孠quartz sand counts. The chronology is based on optically stimulated luminescence and calibrated radiocarbon ages. Relatively wet conditions are marked by lower salinities between 9600 yr and 5700 ...
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    Palaeosalinity records for groundwater-influenced lakes in the southwest Murray Basin were constructed from an ostracod-based, weighted-averaging transfer function, supplemented with evidence from Campylodiscus clypeus (diatom), charophyte oogonia, Coxiella striata (gastropod), Elphidium sp. (foraminifera), Daphniopsis sp. ephippia (Cladocera), and brine shrimp (Parartemia zietziana) faecal pellets, the d18O of ostracods, and > 130 孠quartz sand counts. The chronology is based on optically stimulated luminescence and calibrated radiocarbon ages. Relatively wet conditions are marked by lower salinities between 9600 yr and 5700 yr ago, but mutually exclusive high- and low-salinity ostracod communities suggest substantial variability in effective precipitation in the early Holocene. A drier climate was firmly in place by 4500 yr and is marked at the groundwater-dominated NW Jacka Lake by an increase in aeolian quartz and, at Jacka Lake, by a switch from surface-water to groundwater dominance. Short-lived, low-salinity events at 8800, 7200, 5900, 4800, 2400, 1300 and 400 yr are similar in timing and number to those recorded on Australia's southern continental shelf, and globally, and provide evidence for the existence of the ~ 1500-yr cycle in mainland southern Australia. We surmise that these are cool events associated with periodic equatorward shifts in the westerly wind circulation.
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    Journal Title
    Quaternary Research
    Volume
    77
    Issue
    1
    DOI
    https://doi.org/10.1016/j.yqres.2011.09.013
    Subject
    Environmental Science and Management not elsewhere classified
    Geology
    Physical Geography and Environmental Geoscience
    Archaeology
    Publication URI
    http://hdl.handle.net/10072/46921
    Collection
    • Journal articles

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