There were likely large changes in Southeast (SE) Pacific Ocean biogeochemistry over the last glacial cycle as a consequence of coincident changes in dust flux, oxygenation, and latitudinal position of the Subantarctic and Antarctic Fronts. However, there are few available sediment core records with reliable chronologies for this time interval despite the large number of archived cores collected between the 1960s and 1990s. The apparent reason is that, except for sites in proximity to the South ...
Show moreThis dataset was developed for sediment cores from the SE Pacific that were archived in a variety of repositories. The most promising cores were selected for radiocarbon dating of the planktonic foraminiferal fraction. Sediment handling and processing were similar to Cleaveland and Herbert (2007). Sediment samples of 2 cc size were requested from the core libraries where the target cores have been archived. Upon delivery, they were kept refrigerated. Bulk calcium carbonate for radiocarbon dating was isolated from the greater than 150-millimeter (mm) fraction of wet-sieved bulk sediment and dried prior to analysis.
Samples were sent to the WHOI NOSAMS facility and were prepared according to the methods for carbonate 14C analysis listed at https://www2.whoi.edu/site/nosams/client-services/submitting_guidelines/sample_processes (see related publications).
Carbonate samples are treated with phosphoric acid to generate CO2 which, in turn, is converted to a graphite target. The target is analyzed for 14C on an accelerator mass spectrometer (AMS).
Carbonate samples are treated with phosphoric acid while under vacuum. The acidification of the sample material generates carbon dioxide (CO2) which is then converted to graphite. The graphite is pressed into a target to be analyzed for 14C on an accelerator mass spectrometer (AMS).
Altabet, M. A. (2023) Radiocarbon dating of archived sediment cores in the Southeast Pacific from 1960 to 2000. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2023-01-12 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.886679.1 [access date]
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