UNIGE document Preprint
previous document  unige:134085  next document
add to browser collection
Title

Stable oxygen isotope composition is biased by shell calcification intensity in planktonic Foraminifera

Authors
Groeneveld, Jeroen
Waniek, Joanna
Year 2020
Description 18 p.
Abstract Planktonic Foraminifera are widely used for environmental reconstructions through measurements of their shell’s geochemical characteristics, including its stable oxygen and carbon isotope composition. Using these parameters as unbiased proxies requires a firm knowledge of all potential confounding factors influencing foraminiferal shell geochemistry. One such parameter is the shell calcification intensity (shell weight normalized for shell size) that may influence the shell delta 18O value either bioenergetically (by reducing energy available and required for equilibrium isotope fractionation during faster calcification) or kinetically (by influencing calcification depth through the shell’s density contrast with seawater). Specimens from the Globigerinoides ruber/elongatus compound from a sediment trap in the North Atlantic have been used to quantify the influence of shell calcification intensity on shell delta 18O values. Shell calcification intensity was found to have a significant effect on the shell stable oxygen isotope composition in all species. Through model fitting, it is suggested that the effect size may be in a range of 1 to 2‰ (depending on species, depth migration, and local oceanographic conditions). We show that the confounding effect of shell calcification intensity on stable oxygen isotope composition can be of importance, depending on the anticipated precision of the derived reconstructions. A framework is provided to quantify this effect in future studies.
Keywords Planktonic ForaminiferaCalcificationStable oxygen isotope
Identifiers
Note Soumis dans : Earth and Space Science Open Archive
Full text
Extract (3.3 MB) - public document Free access
Structures
Research group Sedimentology, Biostratigraphy and Micropaleontology
Citation
(ISO format)
WEINKAUF, Manuel et al. Stable oxygen isotope composition is biased by shell calcification intensity in planktonic Foraminifera. 2020. doi: 10.1002/essoar.10502627.1 https://archive-ouverte.unige.ch/unige:134085

97 hits

77 downloads

Update

Deposited on : 2020-04-06

Export document
Format :
Citation style :