[en] The Sr and Ca isotope composition, along with trace element content in fossil teeth, provides valuable insights into biogenic and diagenetic processes. Identifying pristine biological signals is crucial for reconstructing the diet and trophic levels of extinct taxa. We present novel geochemical data from Tyrannosauridae and Ceratopsidae teeth of the Late Cretaceous, using radiogenic Sr (87Sr/86Sr), stable Sr (δ88/86Sr), and Ca (δ44/42Ca) isotopes, along with trace elements abundances to differentiate biogenic signals from diagenetic alteration.
Our results reveal potential taxon-specific diagenetic effects, likely influenced by enamel microstructure. Tyrannosaurid enamel contains lower concentrations of rare earth elements (REE) and uranium (U) than dentine, whereas ceratopsid teeth typically exhibit higher REE and U compared to both the enamel and dentine of tyrannosaurids. Enamel δ44/42Ca values differ significantly between herbivorous ceratopsids and carnivorous tyrannosaurids, reflecting trophic level effects seen in modern mammals and reptiles. A positive correlation between δ44/42Ca and δ88/86Sr suggests partial preservation of biological fractionation along the trophic chain. Yet, the lack of negative δ88/86Sr values in our dataset – typically expected in biologic tissues – suggests alteration by diagenetic processes of both stable and radiogenic Sr. While δ44/42Ca in enamel likely remains a reliable dietary proxy, Sr isotope composition of our samples appears then to be significantly altered. The presence of high δ88/86Sr in terrestrial fossil teeth could serve as a novel diagenetic proxy to assess habitat related 87Sr/86Sr values, aiding provenance and mobility studies in fossil ecosystems.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Michailow, Mateusz M. ; University of Modena and Reggio Emilia > Department of Chemical and Geological Sciences
Lugli, Federico ; University of Modena and Reggio Emilia > Department of Chemical and Geological Sciences ; Goethe University Frankfurt > Institute of Geosciences ; UNIBO - University of Bologna > Department of Cultural Heritage
Cipriani, Anna ; University of Modena and Reggio Emilia > Department of Chemical and Geological Sciences ; Columbia University > Lamont-Doherty Earth Observatory
Della Giustina, Francesco ; Université de Liège - ULiège > Département de géologie > Evolution and diversity dynamics lab
Ferretti, Annalisa ; University of Modena and Reggio Emilia > Department of Chemical and Geological Sciences
Malferrari, Daniele ; University of Modena and Reggio Emilia > Department of Chemical and Geological Sciences
Fowler, Denver; Badlands Dinosaur Museum, Dickinson Museum Center
Fowler, Elizabeth Freedman; Badlands Dinosaur Museum, Dickinson Museum Center ; Dickinson State University > School of Applied Sciences
Weber, Michael ; Johannes Gutenberg University > Institute of Geosciences
Tütken, Thomas; Johannes Gutenberg University > Institute of Geosciences
Language :
English
Title :
Combined Ca, Sr isotope and trace element analyses of Late Cretaceous dinosaur teeth: assessing diet versus diagenesis
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