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Inter‐laboratory Characterisation of Apatite Reference Materials for Oxygen Isotope Analysis and Associated Methodological Considerations

Authors
/persons/resource/agiera

Wudarska,  Alicja
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Wiedenbeck,  Michael
External Organizations;

Słaby,  Ewa
External Organizations;

Lempart‐Drozd,  Małgorzata
External Organizations;

Harris,  Chris
External Organizations;

Joachimski,  Michael M.
External Organizations;

Lécuyer,  Christophe
External Organizations;

MacLeod,  Kenneth G.
External Organizations;

Pack,  Andreas
External Organizations;

Vennemann,  Torsten
External Organizations;

Couffignal,  Frédéric
External Organizations;

Feng,  Dingsu
External Organizations;

/persons/resource/glodnyj

Glodny,  J.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/kuse

Kusebauch,  C.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/smayanna

Mayanna,  S.
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/rocholl

Rocholl,  A.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Speir,  Laura
External Organizations;

Sun,  Yadong
External Organizations;

/persons/resource/fwilke

Wilke,  F.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Wudarska, A., Wiedenbeck, M., Słaby, E., Lempart‐Drozd, M., Harris, C., Joachimski, M. M., Lécuyer, C., MacLeod, K. G., Pack, A., Vennemann, T., Couffignal, F., Feng, D., Glodny, J., Kusebauch, C., Mayanna, S., Rocholl, A., Speir, L., Sun, Y., Wilke, F. (2022 online): Inter‐laboratory Characterisation of Apatite Reference Materials for Oxygen Isotope Analysis and Associated Methodological Considerations. - Geostandards and Geoanalytical Research.
https://doi.org/10.1111/ggr.12416


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5009285
Abstract
Here we report on the oxygen isotope compositions of four proposed apatite reference materials (chlorapatite MGMH#133648 and fluorapatite specimens MGMH#128441A, MZ-TH, and ES-MM). The samples were initially screened for 18O/16O homogeneity using secondary ion mass spectrometry (SIMS) followed by δ18O determinations in six gas source isotope ratio mass spectrometry laboratories (GS-IRMS) employing a variety of analytical protocols for determining either phosphate-bonded or “bulk” oxygen compositions. We also report preliminary δ17O and Δ’17O data, major and trace element compositions collected using EPMA as well as CO32- and OH- contents in the apatite structure assessed using thermogravimetric analysis and infrared spectroscopy. The repeatability of our SIMS measurements was better than ± 0.25 ‰ (1s) for all four materials that cover a wide range of 103δ18O values between +5.8 and +21.7. The GS-IRMS results show, however, a significant offset of 103δ18O values between the “phosphate” and “bulk” analyses that could not be correlated with chemical characteristics of the studied samples. Therefore, we provide two sets of working values specific to these two classes of analytical methodologies as well as current working values for SIMS data calibration.