Influence of depositional environment in fossil teeth: a micro-XRF and XAFS study

22nd International Congress on X-Ray Optics and Microanalysis

Zougrou, I.M.^1 ; Katsikini, M.^1 ; Pinakidou, F.^1 ; Papadopoulou, L.^2 ; Tsoukala, E.^2 ; Paloura, E.C.^1

School of Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece^1

School of Geology, Aristotle University, 54124 Thessaloniki, Greece^2

关键词: Dentinal tubules;    Depositional environment;    External surfaces;    Ferrihydrites;    Lepidocrocite;    Northern Greece;    Synchrotron radiation x-ray fluorescences;    Vertebrate fossils;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/499/1/012015/pdf
DOI  :  10.1088/1742-6596/499/1/012015

来源: IOP

【 摘 要 】

The formation of metal-rich phases during the fossilization of vertebrate fossil teeth, recovered from various deposition environments in northern Greece, is studied by means of synchrotron radiation X-ray fluorescence (SR-XRF) as well as Fe and Mn K edge X-ray absorption fine structure (XAFS) spectroscopy. XRF line-scans from the samples' cross-sections revealed different contamination paths for Mn and Fe. The two-dimensional XRF maps illustrate the spatial distribution of P, Ca, Mn and Fe as well as the precipitation of Fe-rich phases in cementum, dentin and dentinal tubules. Goethite, lepidocrocite and ferrihydrite were detected in the samples' cross-section by means of Fe K edge EXAFS spectroscopy. Moreover the Fe and Mn K edge EXAFS revealed the presence of vivianite and birnessite (MnO2) on the external surface of two samples.