Roper, A.C., Xiong, Y., Song, Y. et al. (5 more authors) (2024) Phosphorus in belemnites: Extraction, quantification, and variability. Chemical Geology, 663. 122266. ISSN 0009-2541
Abstract
Phosphorus is generally considered the ultimate limiting nutrient for marine primary productivity over geological timescales and plays a key role in modulating several biogeochemical cycles. Most established methods for investigating P cycling do not provide direct evidence for water-column P concentrations, but recent work on carbonate associated phosphorus (CAP) has shown there is a potential to record ancient dissolved P concentrations. We present a method to extend the application of carbonate associated P measurements to belemnites, and we quantify variability in P contents within and between belemnite specimens from two stratigraphic levels in Jurassic rocks from the Yorkshire coast, UK, as well as in modern analogues of belemnites.
We show that there is little difference in P measurements between different preparative methods in uncontaminated belemnite calcite samples. In samples with higher levels of contaminant phases of P (P other than CAP), or a greater extent of diagenetic alteration, cleaning with non-oxidative methods and dissolution in weak acids (acetic) was found to minimise the impact of contamination on the measured P contents. P concentrations vary within and between specimens, but variations are not a result of taxonomic differences, and overall P measurements are reproducible between replicate samples, within individual belemnites and within stratigraphic levels. There were statistically significant differences in belemnite P concentrations between the stratigraphic levels studied here, indicating the potential for this technique to be used to measure changes in belemnite CAP through time.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | Phosphorus; Carbonate; Belemnite; Nutrient cycling; Method development; Variability; Calcium carbonate; Calcite; Carbonate associated phosphorus |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 22 Jul 2024 14:29 |
Last Modified: | 12 Aug 2024 14:30 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.chemgeo.2024.122266 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:214997 |