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Caracterização geoquímica da diagénese em dentes de saurópodes como suporte aos estudos isotópicos
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Resumo(s)
Detailed mineralogical and geochemical studies (μ-XRD, μ-XRF, SEM-EDS, LA-ICP-MS) were carried out on sauropod teeth from the Upper Jurassic of the central sector of the Lusitanian Basin. μ-XRD revealed the consistent mineralogical composition of the samples (hydroxyapatite), and μ-XRF confirmed that the chemical composition of the teeth is dominated by Ca and P, with minor concentrations of Fe, Mg, Mn, Al, and K. SEM imaging revealed higher porosity in the dentine compared to the enamel, making it less resistant to post-depositional chemical changes resulting from interaction with formational fluids. LA-ICP-MS maps of trace elements distribution in the teeth allowed us to delimit areas where the original chemical composition is altered due to diagenetic processes, and areas where is preserved the original geochemical signature.
Descrição
Funding information:
Os autores agradecem ainda o apoio financeiro da FCT UIDB/04449/2020 e UIDP/04449/2020 do Laboratório HERCULES, UIDB/04683/2020 do ICT – Instituto de Ciências da Terra e UIDB/04292/2020 do MARE – Centro de Ciências do Mar e do Ambiente
Publisher Copyright:
© 2025 LNEG – Laboratório Nacional de Energia e Geologia IP.
Palavras-chave
diagenetic processes geochemistry Mineralogy Sauropoda Upper Jurassic Renewable Energy, Sustainability and the Environment Environmental Science (miscellaneous) General Earth and Planetary Sciences SDG 7 - Affordable and Clean Energy