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ToolsPaxton, Richmal B., Andrews, Julian E., Dennis, Paul F., Marca, Alina D. and Vonhof, Hubert B. (2025) Some record it hot: Clumped isotope temperatures from Middle Jurassic molluscan aragonite. Sedimentology. ISSN 0037-0746
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Abstract
Clumped isotope (Δ47 ) data from the shell aragonite of Praemytilus strathairdensis, a non-marine Middle Jurassic mytilid from the Inner Hebrides of Scotland, presents a rare geological context for better understanding the effects of diagenesis on Δ47 in skeletal aragonite. Nineteen P. strathairdensis shells gave Δ47 temperatures between 23 ± 5°C and 48 ± 9°C despite having an identical burial/thermal history. During the early Palaeocene these rocks were briefly buried to temperatures warm enough (∼50 to 80°C for <1 my) to sufficiently overcome the activation energy for bond breakage and diffusion in fossil molluscan aragonite. This caused mostly incomplete resetting of some Δ47 derived temperatures to warmer values. As individual shells with the same thermal history record different Δ47 an extrinsic defect regime associated with impurities is implied, possibly varying amounts of water, in the aragonite lattice. Seven P. strathairdensis Δ47 derived temperatures, between 23°C and 30°C, overlap those of within-sequence, early diagenetic calcitic concretion bodies that are not reset. While it is not certain these mollusc anaragonite Δ47 temperatures are wholly unaltered, they may represent a best estimate of Jurassic lagoon water temperatures.
| Item Type: | Article |
|---|---|
| Additional Information: | This work was funded by a Natural Environment Research Council (NE/L002582/1) studentship to RP through the ENVEAST Doctoral Training Partnership at UEA. All data generated or analysed during this study are included in this published article and its supplementary information files which can be accessed at https://doi.org/10.6084/m9.figshare.27616941 . |
| Uncontrolled Keywords: | aragonite,clumped isotopes,diagenesis,jurassic,resetting |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA Faculty of Science |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Geosciences |
| Depositing User: | LivePure Connector |
| Date Deposited: | 25 Nov 2025 14:30 |
| Last Modified: | 25 Nov 2025 14:30 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/101102 |
| DOI: | 10.1111/sed.70059 |
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