A radiocarbon chronology for Sanamere Lagoon, Cape York Peninsula, using multiple organic fractions

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dc.contributor.authorRivera-Araya, Men_AU
dc.contributor.authorRowe, Cen_AU
dc.contributor.authorLevchenko, VAen_AU
dc.contributor.authorUlm, Sen_AU
dc.contributor.authorBird, MIen_AU
dc.date.accessioned2022-05-09T06:57:41Zen_AU
dc.date.available2022-05-09T06:57:41Zen_AU
dc.date.issued2022-05en_AU
dc.date.statistics2022-05-06en_AU
dc.description.abstractThe selection and pre-treatment of reliable organic fractions for radiocarbon age determination is fundamental to the development of accurate chronologies. Sampling from tropical lakes is particularly challenging given the adverse preservation conditions and diagenesis in these environments. Our research is the first to examine and quantify the differences between radiocarbon ages from different carbon fractions and pretreatment protocols from tropical lake sediments. Six different organic fractions (bulk organics, pollen concentrate, cellulose, stable polycyclic aromatic carbon (SPAC), macrocharcoal >250 μm and microcharcoal >63 μm) were compared at six different depths along a 1.72 m long core extracted from Sanamere Lagoon, Cape York Peninsula, northern Australia. Acid-base-acid (ABA), modified ABA (30% hydrogen peroxide + ABA), 2chlorOx (a novel cellulose pre-treatment method) and hydrogen pyrolysis (hypy) were used to pre-treat the organic fractions. The oldest date is ∼31,300 calibrated years before present (cal yr BP) and the youngest is ∼2800 cal yr BP, spanning ∼28,500 years. The smallest offset between the minimum and the maximum age for different fractions and across pretreatment methods at a given depth was found to be 832 years (between SPAC and pollen) and the largest ∼16,750 years (between pollen concentrate and SPAC). The SPAC fractions pre-treated with hypy yielded older ages compared to all other fractions in most cases, while bulk organics yielded consistently younger ages. The magnitude and consistency of the offsets and the physical and chemical properties of the tested organic fractions suggest that SPAC is the most reliable fraction to date in tropical lake sediments and that hypy successfully removes exogenous carbon contamination. © 2022 Elsevier B.V.en_AU
dc.description.sponsorshipFunding from Australian Research Council (Laureate Fellowship to Michael Bird) Grant # FL140100044, Australian Institute of Nuclear Science and Engineering (AINSE) PGRA- Post Graduate Research Award # 12357, Centre of Excellence for Australian Biodiversity and Heritage Grant # CE170100015 and the Australian Government Research Training Program Scholarship.en_AU
dc.identifier.articlenumber101273en_AU
dc.identifier.citationRivera-Araya, M., Rowe, C., Levchenko, V., Ulm, S., & Bird, M. I. (2022). A radiocarbon chronology for Sanamere Lagoon, Cape York Peninsula, using multiple organic fractions. Quaternary Geochronology, 70, 101273. doi:10.1016/j.quageo.2022.101273en_AU
dc.identifier.issn1871-1014en_AU
dc.identifier.journaltitleQuaternary Geochronologyen_AU
dc.identifier.urihttps://doi.org/10.1016/j.quageo.2022.101273en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/13156en_AU
dc.identifier.volume70en_AU
dc.language.isoenen_AU
dc.publisherElsevier B. V.en_AU
dc.subjectCarbon 14en_AU
dc.subjectHydrogenen_AU
dc.subjectSamplingen_AU
dc.subjectLakesen_AU
dc.subjectEnvironmenten_AU
dc.subjectQueenslanden_AU
dc.subjectAustraliaen_AU
dc.subjectCelluloseen_AU
dc.subjectSedimentsen_AU
dc.titleA radiocarbon chronology for Sanamere Lagoon, Cape York Peninsula, using multiple organic fractionsen_AU
dc.typeJournal Articleen_AU
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