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IMPLICATIONS OF SINGLE-STEP GRAPHITIZATION FOR RECONSTRUCTING LATE HOLOCENE RELATIVE SEA-LEVEL USING RADIOCARBON-DATED ORGANIC COASTAL SEDIMENT

Published online by Cambridge University Press:  10 August 2022

Juliet P Sefton Open the ORCID record for Juliet P Sefton [Opens in a new window] ,
Andrew C Kemp ,
Kathryn L Elder Open the ORCID record for Kathryn L Elder [Opens in a new window] ,
Roberta L Hansman  and
Mark L Roberts
Juliet P Sefton*
Affiliation:
Department of Earth and Ocean Sciences, Tufts University, Medford, MA02155, USA
Andrew C Kemp
Affiliation:
Department of Earth and Ocean Sciences, Tufts University, Medford, MA02155, USA
Kathryn L Elder
Affiliation:
National Ocean Sciences Accelerator Mass Spectrometry Facility, Woods Hole Oceanographic Institution, Woods Hole, MA02543, USA
Roberta L Hansman
Affiliation:
National Ocean Sciences Accelerator Mass Spectrometry Facility, Woods Hole Oceanographic Institution, Woods Hole, MA02543, USA
Mark L Roberts
Affiliation:
National Ocean Sciences Accelerator Mass Spectrometry Facility, Woods Hole Oceanographic Institution, Woods Hole, MA02543, USA
*
*Corresponding author. Email: juliet.sefton@monash.edu
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Abstract

Late Holocene relative sea-level reconstructions are commonly generated using proxies preserved in salt-marsh and mangrove sediment. These depositional environments provide abundant material for radiocarbon dating in the form of identifiable macrofossils (salt marshes) and bulk organic sediment (mangroves). We explore if single-step graphitization of these samples in preparation for radiocarbon dating can increase the number and temporal resolution of relative sea-level reconstructions without a corresponding increase in cost. Dating of salt-marsh macrofossils from the northeastern United States and bulk mangrove sediment from the Federated States of Micronesia indicates that single-step graphitization generates radiocarbon ages that are indistinguishable from replicates prepared using traditional graphitization, but with a modest increase in error (mean/maximum of 6.25/15 additional 14C yr for salt-marsh macrofossils). Low 12C currents measured on bulk mangrove sediment following single-step graphitization likely render them unreliable despite their apparent accuracy. Simulated chronologies for six salt-marsh cores indicate that having twice as many radiocarbon dates (since single-step graphitization costs ∼50% of traditional graphitization) results in narrower confidence intervals for sample age estimated by age-depth models when the additional error from the single-step method is less than ∼50 14C yr (∼30 14C yr if the chronology also utilizes historical age markers). Since these thresholds are greater than our empirical estimates of the additional error, we conclude that adopting single-step graphitization for radiocarbon measurements on plant macrofossils is likely to increase precision of age-depth models by more than 20/10% (without/with historical age markers). This improvement can be implemented without additional cost.

Keywords

age-depth modelmangroveMassachusettsMicronesiasalt marsh
Type
Research Article
Information
Radiocarbon , Volume 64 , Issue 5 , October 2022 , pp. 1139 - 1158
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Copyright
© The Author(s), 2022. Published by Cambridge University Press for the Arizona Board of Regents on behalf of the University of Arizona

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