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Type: Journal article
Title: Climates of the last three interglacials in subtropical eastern Australia inferred from wetland sediment geochemistry
Author: Kemp, C.W.
Tibby, J.
Arnold, L.J.
Barr, C.
Gadd, P.S.
Marshall, J.C.
McGregor, G.B.
Jacobsen, G.E.
Citation: Palaeogeography, Palaeoclimatology, Palaeoecology, 2020; 538:1-16
Publisher: Elsevier
Issue Date: 2020
ISSN: 0031-0182
Statement of
C.W. Kemp, J. Tibby, L.J. Arnold, C. Barr, P.S. Gadd, J.C. Marshall, G.B. McGregor, G.E. Jacobsen
Abstract: Records of Australian climate during Marine Isotope Stages 5 and 7 (130–71 and 243–191 ka) are rare, preventing detailed assessments of long-term climate, drivers and ecological responses across the continent over glacial-interglacial timescales. This study presents a geochemistry-based palaeoclimate record from Fern Gully Lagoon on North Stradbroke Island (also known as Minjerribah) in subtropical eastern Australia, which records climates in MIS 7a–c, MIS 5 and much of the Holocene, in addition to MIS 4 (71–57 ka), and parts of MIS 6, MIS 3 and MIS 2 (191–130, 57–29 and 29–14 ka). Indicators of inorganic sedimentation from a 9.5 m sediment core – focussed on high-resolution estimates of sediment geochemistry supported by x-radiography, inorganic content and magnetic susceptibility – were combined with a chronology consisting of six radiocarbon (14C) and thirteen single-grain optically stimulated luminescence (OSL) ages. Hiatuses occurred at ~178–153 ka, ~36–21 ka and ~7–2 ka and likely result from the wetland drying. Low values of locally sourced aeolian materials indicate a wet MIS 7a–c and early MIS 6 before a relatively dry MIS 5. Inorganic flux during the Holocene was up to four times greater than during MIS 5, consistent with long-term interglacial drying observed in other regions, most notably in central Australia. This study highlights the importance of employing a combination of multiple dating approaches and calibrated geochemical proxies to derive climate reconstructions and to identify depositional complexities in organic-rich wetland records.
Keywords: Palaeoclimate; North Stradbroke Island; Holocene; MIS 5; MIS 7; μXRF
Rights: © 2019 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.palaeo.2019.109463
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