Technical note : no impact of alkenone extraction on foraminiferal stable isotope, trace element and boron isotope geochemistry
Date
14/12/2022Grant ID
805246
EP/T019298/1
EP/R023751/1
Metadata
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Abstract
Recent advances in geochemical techniques mean that several robust proxies now exist to determine the past carbonate chemistry of the oceans. Foraminiferal δ11B and alkenone carbon isotopes allow us to reconstruct sea-surface pH and pCO2, respectively, and the ability to apply both proxies to the same sediment sample would give strongly paired datasets and reduce sample waste. However, no studies to date have examined whether the solvents and extraction techniques used to prepare alkenones for analysis also impact the geochemistry of foraminifera within those sediments. Here we examine six species pairs of planktic foraminifera, with half being taken from non-treated sediments and half being taken from sediments where alkenones have been extracted. We look for visual signs of contrasting preservation and compare analyses of δ18O, δ13C, δ11B and trace elements (Li, B, Na, Mn, Mg, Sr and U/Ca). We find no consistent geochemical offset between the treatments and excellent agreement in δ11B measurements between them. Our results show that boron isotope reconstructions of pH in foraminifera from alkenone-extracted sediments can be applied with confidence.
Citation
Crumpton-Banks , J G M , Tanner , T , Hernández Almeida , I , Rae , J W B & Stoll , H 2022 , ' Technical note : no impact of alkenone extraction on foraminiferal stable isotope, trace element and boron isotope geochemistry ' , Biogeosciences , vol. 19 , no. 24 , pp. 5633-5644 . https://doi.org/10.5194/bg-19-5633-2022
Publication
Biogeosciences
Status
Peer reviewed
ISSN
1726-4170Type
Journal article
Rights
Copyright © Author(s) 2022. This work is distributed under the Creative Commons Attribution 4.0 License.
Description
Funding: This research has been supported by the Swiss National Science Foundation (Award 200021_182070 to Heather M. Stoll) and ETH core funding. James W. B. Rae received funding from the European Research Council under the European Union's Horizon 2020 research and innovation programme (grant agreement 805246). We acknowledge the support of the EPSRC Light Element Analysis Facility Grant EP/T019298/1 and the EPSRC Strategic Equipment Resource Grant EP/R023751/1, which supported SEM analyses at the University of St Andrews.Collections
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