Radiocarbon Measurements of Small-Size Foraminiferal Samples with the Mini Carbon Dating System (MICADAS) at the University of Bern: Implications for Paleoclimate Reconstructions

Gottschalk, Julia; Szidat, Sönke; Michel, Elisabeth; Mazaud, Alain; Salazar Quintero, Gary Abdiel; Battaglia, Michael; Lippold, Jörg; Jaccard, Samuel (2018). Radiocarbon Measurements of Small-Size Foraminiferal Samples with the Mini Carbon Dating System (MICADAS) at the University of Bern: Implications for Paleoclimate Reconstructions. Radiocarbon, 60(2), pp. 469-491. Arizona Board of Regents, University of Arizona 10.1017/RDC.2018.3

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Radiocarbon (14C) measurements of foraminifera often provide the only absolute age constraints in marine sediments. However, they are often challenging as their reliability and accuracy can be compromised by reduced availability of adequate sample material. New analytical advances using the MIni CArbon DAting System (MICADAS) allow 14C dating of very small samples, circumventing size limitations inherent to conventional 14C measurements with accelerator mass spectrometry (AMS). Here we use foraminiferal samples and carbonate standard material to assess the reproducibility and precision of MICADAS 14C analyses, quantify contamination biases, and determine foraminiferal 14C blank levels. The reproducibility of conventional 14C ages for our planktic (benthic) foraminiferal samples from gas measurements is 200 (130) yr, and has good precision as illustrated by the agreement between both standards and their reference values as well as between small gas- and larger graphitized foraminiferal samples (within 100±60 yr). We observe a constant contamination bias and slightly higher 14C blanks for foraminifera than for carbonate reference materials, limiting gas (graphite) 14C age determinations for foraminifera from our study sites to ~38 (~42) kyr. Our findings underline the significance of MICADAS gas analyses for 14C on smaller-than-conventional sized foraminiferal samples for paleoclimate reconstructions and dating.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Gottschalk, Julia; Szidat, Sönke; Salazar Quintero, Gary Abdiel; Battaglia, Michael and Jaccard, Samuel

Subjects:

500 Science > 540 Chemistry
500 Science > 550 Earth sciences & geology

ISSN:

0033-8222

Publisher:

Arizona Board of Regents, University of Arizona

Language:

English

Submitter:

Samuel Jaccard

Date Deposited:

07 May 2018 15:12

Last Modified:

23 May 2018 08:27

Publisher DOI:

10.1017/RDC.2018.3

BORIS DOI:

10.7892/boris.114950

URI:

https://boris.unibe.ch/id/eprint/114950

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