Radiocarbon Age Offsets Between Two Surface Dwelling Planktonic Foraminifera Species During Abrupt Climate Events in the SW Iberian Margin.

ABSTRACT: This study identifies temporal biases in the radiocarbon ages of the planktonic foraminifera species Globigerina bulloides and Globigerinoides ruber (white) in a sediment core from the SW Iberian margin (so-called Shackleton site). Leaching of the outer shell and measurement of the radiocarbon content of both the leachate and leached sample enabled us to identify surface contamination of the tests and its impact on their ¹⁴C ages. Incorporation of younger radiocarbon on the outer shell affected both species and had a larger impact downcore. Interspecies comparison of the ¹⁴C ages of the leached samples reveal systematic offsets with ¹⁴C ages for G. ruber being younger than G. bulloides ages during the last deglaciation and part of the Early and mid-H

SUBMITTER: Ausin B 

PROVIDER: S-EPMC6392128 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature