Reconstructing the late Pleistocene climate sequence at Alexandra Cave, Naracoorte, using trapped charge dating and palaeoenvironmental proxies

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dc.contributor.authorPriya, LJen_AU
dc.contributor.authorArnold, MDen_AU
dc.contributor.authorGuilarte, Ven_AU
dc.contributor.authorCohen, TJen_AU
dc.contributor.authorTyler, JJen_AU
dc.contributor.authorDemuro, Men_AU
dc.contributor.authorGadd, PSen_AU
dc.contributor.authorReed, EHen_AU
dc.date.accessioned2024-02-29T03:55:00Zen_AU
dc.date.available2024-02-29T03:55:00Zen_AU
dc.date.issued2021-07-08en_AU
dc.date.statistics2023-02-03en_AU
dc.description.abstractThe drivers of Australia-wide megafaunal extinction during the late Pleistocene remain poorly resolved. Hypotheses include individual or synergistic combinations of climate fluctuations, human impacts through hunting or habitat alteration by landscape burning. Moreover, the relationship between extinction dynamics and long term glacial - interglacial environmental change is not yet understood. Using a series of complementary geochronological, palaeoecological and geochemical techniques on a sedimentary sequence in Alexandra Cave, Naracoorte, this study provides improved reconstructions of past climates in south-east South Australia prior to, and around the time of, megafaunal extinction. Optically stimulated luminescence and electron spin resonance dating constrain the age of the sedimentary sequence to Marine Isotope Stage (MIS) 1 – 5. Preliminary environmental reconstructions undertaken using carbon isotopes of charcoal and Itrax micro X-ray fluorescence analysis reveal high precipitation during late MIS 5, while MIS 4 was arid. Decreased organic matter and increased sedimentation rates in mid-late MIS 3 suggest a change in landscape conditions, consistent with an environmental shift around the time of megafaunal demise locally. The Last Glacial maximum was arid, with frequent local fires, followed by a shift during the Holocene, marked by an increase in precipitation.en_AU
dc.identifier.citationPriya, L. J., Arnold, M. D., Guilarte, V., Cohen, T., Tyler, J., Demuro, M., Gadd, P., & Reed, E. H. (2021). Reconstructing the late Pleistocene climate sequence at Alexandra Cave, Naracoorte, using trapped charge dating and palaeoenvironmental proxies. Paper presented to the Australasian Quaternary Association/Friends of the Pleistocene Pop-up Conference 2021, 8-9th July 2021. Retrieved from: http://aqua.org.au/wp-content/uploads/2021/07/Abstract-book-2021-1.pdfen_AU
dc.identifier.conferenceenddate2021-07-09en_AU
dc.identifier.conferencenameAustralasian Quaternary Association/Friends of the Pleistocene Pop-up Conference 2021en_AU
dc.identifier.conferenceplaceOnlineen_AU
dc.identifier.conferencestartdate2021-07-08en_AU
dc.identifier.urihttp://aqua.org.au/wp-content/uploads/2021/07/Abstract-book-2021-1.pdfen_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/15491en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Union (AGU)en_AU
dc.subjectLuminescenceen_AU
dc.subjectAge estimationen_AU
dc.subjectElectron spin resonanceen_AU
dc.subjectCharcoalen_AU
dc.subjectIsotopesen_AU
dc.subjectSouth Australiaen_AU
dc.subjectClimatic changeen_AU
dc.subjectHumansen_AU
dc.subjectEnvironmenten_AU
dc.subjectHabitaten_AU
dc.subjectPlantsen_AU
dc.subjectGlaciersen_AU
dc.subjectQuaternary perioden_AU
dc.titleReconstructing the late Pleistocene climate sequence at Alexandra Cave, Naracoorte, using trapped charge dating and palaeoenvironmental proxiesen_AU
dc.typeConference Presentationen_AU
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