Dating oxygen isotopes

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Note — The laboratory also automatically includes d18O and d13C values alongside radiocarbon dating results for carbonate samples. The d18O and d13C measurements are performed simultaneously on the carbonates in an isotope ratio mass spectrometer IRMS at no additional cost to the client. The interpretation of d18O values, as applied in paleotemperature studies and paleoclimate reconstructions, lies with the submitter.

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Ice consists of water molecules made of atoms that come in versions with slightly different mass, so-called isotopes.

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Isotopes are atoms that have the same atomic number, but a different mass number, which is the number of protons and neutrons. Because the atomic number, or the number of protons, characterizes an element, isotopes are the same element but have a different number of neutrons van Grieken and de Bruin, The dominant oxygen isotope is 16O, meaning it has 8 protons and 8 neutrons, but 18O, an isotope with 10 neutrons, also exists.

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