(Table 1) Shell mass and chemistry of Globigerinoides sacculifer


Using bathymetric transects of surface sediments underlying similar sea surface temperatures but exposed to increasing dissolution, we examined the processes which affect the relationship between foraminiferal Mg/Ca and d18O. We found that Globigerinoides saccculifer calcifies over a relatively large range of water depth and that this is apparent in their Mg content. On the seafloor, foraminiferal Mg/Ca is substantially altered by dissolution with the degree of alteration increasing with water depth. Selective dissolution of the chamber calcite, formed in surface waters, shifts the shell's bulk Mg/Ca and d18O toward the chemistries of the secondary crust acquired in colder thermocline waters. The magnitude of this shift depends on both the range of temperatures over which the shell calcified and the degree to which it is subsequently dissolved. In spite of this shift the initial relationship between Mg/Ca and d18O, determined by their temperature dependence, is maintained. We conclude that paired measurements of d18O and Mg/Ca can be used for reconstructing d18Owater, though care must be taken to determine where in the water column the reconstruction applies.

Supplement to: Rosenthal, Yair; Lohmann, G P; Lohmann, Kyger C; Sherrell, R M (2000): Incorporation and preservation of Mg in Globigerinoides sacculifer: implications for reconstructing the temperature and 18O/16O of seawater. Paleoceanography, 15(1), 135-145

DOI https://doi.org/10.1594/PANGAEA.855384
Related Identifier https://doi.org/10.1029/1999PA000415
Related Identifier https://doi.org/10.1029/96PA01491
Related Identifier https://doi.org/10.1016/0025-3227(86)90004-6
Related Identifier https://doi.org/10.1029/PA005i004p00487
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.855384
Creator Rosenthal, Yair ORCID logo; Lohmann, G P; Lohmann, Kyger C ORCID logo; Sherrell, R M
Publisher PANGAEA
Publication Year 2000
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Resource Type Supplementary Dataset; Dataset
Format text/tab-separated-values
Size 238 data points
Discipline Earth System Research
Spatial Coverage (-19.762W, -2.179S, 157.001E, 26.190N); Pacific; Ontong Java Plateau; Providence Channel
Temporal Coverage Begin 1981-05-26T00:00:00Z
Temporal Coverage End 1984-11-08T00:00:00Z