Comparison of uranium-lead (U-Pb) dating analysis for international apatite reference materials and two fossil fish teeth



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Bioapatite (Ca5(PO4)3OH) and apatite (Ca5(PO4)3(F, Cl, OH)) are found in nature, and their ages can be determined by the Uranium-Lead (U-Pb) isotope dating technique. The goals of this research were to investigate U-Pb dating of known international apatite reference materials and Cladocyclus gardneri (CG) and Neoproscinetes Penalvai (NP) fossil fish teeth (bioapatite samples) and to provide an improved understanding of the effects of secondary alteration on the U-Pb dates of fossil teeth. Teeth were mounted in epoxy and imaged by optical microscopy. Analyses were made by Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS). U-Pb data reduction was carried out using Iolite v. 4 software and the VizualAge-UcomPbine data reduction scheme. U-Pb dates of the fish teeth diverged from the expected age of fossilization as a result of secondary mobility of U, which was variable both between and within teeth. The expected age of the teeth was ~110 Ma based on biostratigraphy and the closest results were 67.0 ± 0.8 Ma for CG samples (measured on 30µm laser ablation spots), and 45.0 ± 1.5 Ma and 128.6 ± 12.9 Ma for NP samples (on 30µm and 60µm ablation spots, respectively).

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U-Pb Dating, LA-ICP-MS, Kovdor Apatite, Durango Apatite, McClure Mountain Apatite, Bioapatite, Fossil Fish Teeth, Cladocyclus gardneri, Neoproscinetes Penalvai