Sedimentation rates calculated on surface sediment samples from different site of the Atlantic and Pacific Oceans (Table 1)

DOI

Radiocarbon ages on CaCO3 from deep-sea cores offer constraints on the nature of the CaCO3 dissolution process. The idea is that the toll taken by dissolution on grains within the core top bioturbation zone should be in proportion to their time of residence in this zone. If so, dissolution would shift the mass distribution in favor of younger grains, thereby reducing the mean radiocarbon age for the grain ensemble. We have searched in vain for evidence supporting the existence of such an age reduction. Instead, we find that for water depths of more than 4 km in the tropical Pacific the radiocarbon age increases with the extent of dissolution. We can find no satisfactory steady state explanation and are forced to conclude that this increase must be the result of chemical erosion. The idea is that during the Holocene the rate of dissolution of CaCO3 has exceeded the rain rate of CaCO3. In this circumstance, bioturbation exhumes CaCO3 from the underlying glacial sediment and mixes it with CaCO3 raining from the sea surface.

depth is the apparent mixing depth, as determined by a downcore series of radiocarbon age

Supplement to: Broecker, Wallace S; Klas, Mieczyslawa; Clark, Elizabeth; Bonani, Georges; Ivy, Susan; Wolfli, Willy (1991): The influence of CaCO3 dissolution on core top radiocarbon ages for deep-sea sediments. Paleoceanography, 6(5), 593-608

Identifier
DOI https://doi.org/10.1594/PANGAEA.52464
Related Identifier https://doi.org/10.1029/91PA01768
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Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.52464
Provenance
Creator Broecker, Wallace S ORCID logo; Klas, Mieczyslawa; Clark, Elizabeth; Bonani, Georges; Ivy, Susan; Wolfli, Willy
Publisher PANGAEA
Publication Year 1991
Funding Reference Fourth Framework Programme https://doi.org/10.13039/100011105 Crossref Funder ID MAS3980185 https://cordis.europa.eu/project/id/MAS3980185 Quaternary Environment of the Eurasian North
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 219 data points
Discipline Earth System Research
Spatial Coverage (-174.703W, -17.638S, 163.707E, 78.225N); North Atlantic; Amerasian Basin; Eastern Equatorial Pacific; Fram Strait; Atlantic Ocean
Temporal Coverage Begin 1963-08-15T00:00:00Z
Temporal Coverage End 1985-08-01T00:00:00Z