Compound-specific 14C isotope composition in marine and terrestrial sedimentary archives from sub-Antarctic South Georgia

DOI

The dataset comprises radiocarbon (14C) data that was obtained on sediment samples from sub-Antarctic South Georgia. The sediments were collected from a range of different sites, including lakes, peat deposits, a marine inlet and a fjord during RV Polarstern expedition PS81 in 2013. Prior to the geochemical analyses reported here, the sediments were freeze-dried and ground. More details on the study sites, sampling and data evaluation can be found in Berg et al. (submitted manuscript).Sediment and plant samples for Radiocarbon (14C) analysis were pre-treated and analyzed as described by Rethemeyer et al. (2019). For the analysis of 14C in bulk organic carbon (bulk OC) and plant fossils were washed with 1% HCl (1 hr, 60°C followed by ca. 10 hr at room temperature) to remove carbonates. The acid insoluble fraction was then graphitized and analyzed for 14C at the CologneAMS facility (Cologne, Germany).For compound-specific 14C analysis individual alkanoic acids, alkanes and alkanols were isolated by preparative capillary GC using a gas chromatograph (7680 Agilent Technologies, USA) equipped with a CIS 4 injection system (Gerstel, Germany), coupled with a preparative fraction collector (PFC; Gerstel, Germany). The purity and quantity of individual compounds was monitored by GC-FID (Agilent 7890B equipped with an on-column injector, Agilent Technologies, USA). Samples with a purity of >98% were processed further. For samples from core Co1305 compound-specific 14C analysis was performed on a MICADAS AMS system equipped with a gas ionization source (ETH Zurich, Switzerland, Wacker et al., 2010) on purified CO2 produced by combustion in vacuum-sealed quartz tubes. Compound ages were corrected for processing blanks and carbon added during derivatization using mass balance (Berg et al., 2020). For core Co1308 compound-specific 14C analysis was conducted on the original isolated compounds with a High Voltage 6 MV Tandetron coupled to an EA-GIS periphery at the CologneAMS facility (Stolz et al., 2019).Compound-specific F14C values were corrected for processing blanks and the addition of one carbon atom during derivatization using mass balance (Berg et al. 2020 and Scheidt et al., 2021). AMS results are reported as fraction modern (F14C) and conventional radiocarbon ages (yrs BP) as outlined in Stuiver & Polach (1977)

Dated material:bulk organic carbon (bulk OC): acid insoluble fraction of organic carbon (AIO)plant makrofossil (plant): acid insoluble fraction of organic carbon (AIO)alkanol with x carbon atoms (Cx:0 alkanol): Compound-specific 14C age of alkanol with x carbon atomsalkanoic acid with x carbon atoms (Cx:0 alkanoic acid): Compound-specific 14C age of alkanoic acid with x carbon atomsalkane with x carbon atoms (Cx:0 alkane): Compound-specific 14C age of alkane with x carbon atoms

Identifier
DOI https://doi.org/10.1594/PANGAEA.967398
Related Identifier IsPartOf https://doi.org/10.1594/PANGAEA.967394
Related Identifier IsDerivedFrom https://doi.org/10.1029/2020PA003890
Related Identifier IsDerivedFrom https://doi.org/10.1594/PANGAEA.920081
Related Identifier IsDerivedFrom https://doi.org/10.1017/qua.2018.85
Related Identifier References https://doi.org/10.1017/RDC.2019.16
Related Identifier References https://doi.org/10.3389/feart.2020.598448
Related Identifier References https://doi.org/10.1016/j.nimb.2018.12.008
Related Identifier References https://doi.org/10.1017/S0033822200003672
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.967398
Provenance
Creator Berg, Sonja ORCID logo; Kusch, Stephanie ORCID logo; Jivcov, Sandra ORCID logo
Publisher PANGAEA
Publication Year 2024
Funding Reference German Research Foundation https://doi.org/10.13039/501100001659 Crossref Funder ID 463250038 https://gepris.dfg.de/gepris/projekt/463250038 Integrating terrestrial and marine sediment records from East Antarctica to explore late Pleistocene and Holocene ice sheet instability; German Research Foundation https://doi.org/10.13039/501100001659 Crossref Funder ID 5472008 https://gepris.dfg.de/gepris/projekt/5472008 Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
Rights Creative Commons Attribution 4.0 International; Data access is restricted (moratorium, sensitive data, license constraints); https://creativecommons.org/licenses/by/4.0/
OpenAccess false
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 1368 data points
Discipline Earth System Research
Spatial Coverage (-36.591W, -54.215S, -36.538E, -54.188N); South Atlantic Ocean
Temporal Coverage Begin 2013-04-01T00:00:00Z
Temporal Coverage End 2013-04-11T00:00:00Z