Ontogenetic variability in crystallography and mosaicity of conodont apatite: implications for microstructure, palaeothermometry and geochemistry

Mohammad Shohel; Neo E. B. McAdams; Bradley D. Cramer; Tori Z. Forbes

doi:10.1098/rsos.200322

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Ontogenetic variability in crystallography and mosaicity of conodont apatite: implications for microstructure, palaeothermometry and geochemistry

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Ontogenetic variability in crystallography and mosaicity of conodont apatite: implications for microstructure, palaeothermometry and geochemistry

Mohammad Shohel, Neo E. B. McAdams, Bradley D. Cramer and Tori Z. Forbes

Royal Society Open Science, Vol.7(7), p.200322

2020

DOI: 10.1098/rsos.200322

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Abstract

X-ray diffraction data from Silurian conodonts belonging to various developmental stages of the species Dapsilodus obliquicostatus demonstrate changes in crystallography and degree of nanocrystallite ordering (mosaicity) in both lamellar crown tissue and white matter. The exclusive use of a single species in this study, combined with systematic testing of each element type at multiple locations, provided insight into microstructural and crystallographic differentiation between element type ( S a , S b - c , M ) as well as between juveniles and adults. A relative increase in the unit cell dimensions a / c ratio of nanocrystallites during growth was apparent in areas demonstrating single-crystal behaviour, but no such relationship was seen in dominantly polycrystalline areas. Systematic variations in mosaicity were identified, with mosaicity (as a proxy for disorder) increasing during growth, as well as along elements from tip to base. These results provide potential insight into the integrity of conodont apatite as a recorder of palaeoseawater chemistry, as well as demonstrate the need to consider the influence of ontogeny and element type on the use of conodonts in palaeothermometry and geochemical investigations.

Details

Title: Subtitle: Ontogenetic variability in crystallography and mosaicity of conodont apatite: implications for microstructure, palaeothermometry and geochemistry
Creators: Mohammad Shohel - University of Iowa
Neo E. B. McAdams - Texas Tech University
Bradley D. Cramer - University of Iowa
Tori Z. Forbes - University of Iowa
Resource Type: Journal article
Publication Details: Royal Society Open Science, Vol.7(7), p.200322
DOI: 10.1098/rsos.200322
ISSN: 2054-5703
Grant note: name: United States National Science Foundation, award: 1455030; DOI: 10.13039/100006770, name: American Chemical Society Petroleum Research Fund, award: 18485100
Language: English
Date published: 2020
Academic Unit: Civil and Environmental Engineering; Office Of The Provost; International Programs; Core Research Facilities; Earth and Environmental Sciences; Chemistry
Record Identifier: 9984230630502771

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