Chemical and isotopic architecture of the belemnite rostrum
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The crystallographic orientation changes close to the apical line/alveolar cavity, confirming the postulation of Ullmann et al. (2015).
“This observation confirms the postulation presented in Ullmann et al (2015) that the crystallographic orientation should change close to the apical line/alveolar cavity.”
From Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry (2020) · cites this paper as Ullmann et al (2015)
Excluding apical line calcite measurements, the reconstructed temperature range is 21-32°C, with mean and median remaining at 26°C.
“While excluding the apical line calcite measurements (this area of the belemnite is notoriously known to favour the precipitation of early diagenetic calcite, e.g. Ullmann et al., 2015; Benito et al., 2016), the range is narrowed to 21 - 32 °C, with the mean and median remaining at 26 °C.”
From Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry (2020) · cites this paper as Ullmann et al., 2015
The apical area is prone to diagenetic alteration, as indicated by higher concentrations of Mn and Fe in this region.
“This originally slightly porous area (Ullmann et al., 2015) is prone to diagenetic alteration, as indicated by the higher concentrations of Mn and Fe in this region (Fig. 4 and Appendix B), thus favouring the circulation of diagenetic fluids (e.g. Ullmann et al., 2015; Benito et al., 2016).”
From Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry (2020) · cites this paper as Ullmann et al., 2015
The radiaxial fibrous calcites in belemnite rostra increase in size from the centre towards the outer rim.
“The SEM-BSE image (Fig. 3B) and EBSD data (Fig. 3) show radiaxial fibrous calcites that increase in size (length and width) from the centre towards the outer rim, in agreement with published SEM and light-microscopy observations on very well-preserved belemnite rostra (Ullmann et al., 2015; Benito at al., 2016).”
From Unravelling Middle to Late Jurassic palaeoceanographic and palaeoclimatic signals in the Hebrides Basin using belemnite clumped isotope thermometry (2020) · cites this paper as Ullmann et al., 2015
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- Authors
- Ullmann, C. V., Frei, R., Korte, C., & Hesselbo, S. P.
- Affiliations
- University of Copenhagen (DK)
- University of Exeter (GB)
- Corresponding author
- Ullmann, C.V.
- Venue
- Geochimica et Cosmochimica Acta
- Publisher
- Elsevier BV
- Published
- 2015-06
- Volume
- 159
- Pages
- 231-243
- ISSN
- 0016-7037 (ISSN-L)
- OpenAlex
- W2002641275
- Cited by
- 49
- References
- 56
- Citations by year
- 2026: 1 · 2025: 4 · 2024: 7 · 2023: 4 · 2022: 3 · 2021: 4 · 2020: 3 · 2019: 2 · 2018: 4 · 2017: 8 · 2016: 5 · 2015: 4
- FWCI
- 4.77
- Type
- journal article
- Language
- en
- Open access
- green
- hdl.handle.net
- Locations
- Geochimica et Cosmochimica Acta (publishedVersion)
- Open Research Exeter (University of Exeter) (submittedVersion)
- Figshare (submittedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
- Funders
- German National Academy of Sciences (LPDS 2014-08)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
- Physical Sciences › Earth and Planetary Sciences › Atmospheric Science › Geology and Paleoclimatology Research
- Keywords
- calcite geochemistry, carbon isotopes, oxygen isotopes, Mg/Ca ratio, Sr/Ca ratio, Mn/Ca ratio, growth rate effects, growth bands, Jurassic-Cretaceous, paleoenvironmental reconstruction, chemostratigraphy, sampling bias
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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
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