Clumped isotope analysis of Central Australian carbonates: a potential palaeoclimate proxy for Australia’s arid interior

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dc.contributor.authorNixon, Fen_AU
dc.contributor.authorTyler, JJen_AU
dc.contributor.authorPriestley, SCen_AU
dc.contributor.authorCohen, TJen_AU
dc.contributor.authorKlaebe, RMen_AU
dc.contributor.authorCrossey, LJen_AU
dc.contributor.authorKarlstrom, KEen_AU
dc.contributor.authorPolak, VJen_AU
dc.contributor.authorAsmerom, Yen_AU
dc.contributor.authorLove, AJen_AU
dc.contributor.authorHua, Qen_AU
dc.contributor.authorWade, Ben_AU
dc.contributor.authorPollard, Ten_AU
dc.contributor.authorDrysdale, RNen_AU
dc.contributor.authorHall, PAen_AU
dc.date.accessioned2023-01-27T01:28:38Zen_AU
dc.date.available2023-01-27T01:28:38Zen_AU
dc.date.issued2022-12-13en_AU
dc.date.statistics2023-01-20en_AU
dc.description.abstractQuantitative records of past temperature variability in arid environments are crucial for validating climate models and their ability to capture the full range of the Earth’s climatic regions. However, arid zone temperature reconstructions are rare, particularly in the Southern Hemisphere, including Australia. The clumped isotope thermometer provides a novel approach to potentially address this demand by allowing the estimation of carbonate precipitation temperature independent of environmental water isotopic composition. Two types of carbonate materials offer potential for clumped isotope temperature reconstructions in arid central Australia: fossil mollusk shells deposited within the shoreline sediments of now dry lakes, and tufa deposits formed in mound springs fed by continuous discharge of Great Artesian Basin groundwater. Here we present preliminary clumped isotope analyses from tufa and shell samples from central Australia. We also discuss the use of micro-XRF scanning and XRD to evaluate sample suitability for both clumped isotope analysis and U-series dating. Air temperatures inferred from tufa Δ47 measurements suggest mean annual air temperatures (MAAT) ~5°C cooler than present between 12-9 ka, which supports palaeoclimate model based estimates for central Australia. Average air temperatures inferred from mollusk shells indicate MAAT at least 15°C cooler than present during 70-35 ka, suggesting a larger MAAT reduction than previously estimated. Carbonate δ18O appears to have been largely driven by changes in environmental water δ18O for lakes but not for mound springs, reflecting different hydrological controls on the two water sources. Agreement between temperatures and palaeoclimate models suggest clumped isotope analysis may function as a valuable quantitative palaeotemperature proxy in central Australia. Analysis of additional tufa and shell samples along with an investigation of the genesis of different tufa is ongoing.en_AU
dc.identifier.articlenumberPP12E-0670en_AU
dc.identifier.booktitleAGU Fall Meeting Abstractsen_AU
dc.identifier.citationNixon, F., Tyler, J. J., Priestley, S. C., Cohen, T. J., Klaebe, R. M., Crossey, L. J., Karlstrom, K. E., Polyak, V. J., Asmerom, Y., Love, A. J., Hua, Q., Wade, B., Pollard, T., Drysdale, R., & Hall, P. A. (2022). Clumped isotope analysis of Central Australian carbonates: a potential palaeoclimate proxy for Australia’s arid interior. Poster presented to the AGU Fall Meeting, Chicago, IL & Online Everywhere, 12-16 December 2022. In AGU Fall Meeting Abstracts (Vol. 2022, PP12E-0670). Retrieved from: https://agu.confex.com/agu/fm22/meetingapp.cgi/Paper/1057568en_AU
dc.identifier.conferenceenddate16 December 2022en_AU
dc.identifier.conferencenameAGU Fall Meetingen_AU
dc.identifier.conferenceplaceChicago, IL & Online Everywhereen_AU
dc.identifier.conferencestartdate12 December 2022en_AU
dc.identifier.urihttps://agu.confex.com/agu/fm22/meetingapp.cgi/Paper/1057568en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/14547en_AU
dc.identifier.volume2022en_AU
dc.language.isoenen_AU
dc.publisherAmerican Geophysical Union (AGU)en_AU
dc.subjectCarbon isotopesen_AU
dc.subjectCalciteen_AU
dc.subjectOxygenen_AU
dc.subjectClimatic changeen_AU
dc.subjectEnvironmenten_AU
dc.subjectWateren_AU
dc.subjectOxygen 18en_AU
dc.subjectX-ray fluorescence analysisen_AU
dc.titleClumped isotope analysis of Central Australian carbonates: a potential palaeoclimate proxy for Australia’s arid interioren_AU
dc.typeConference Posteren_AU
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