Deutsch
 
Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT
  SIMS oxygen isotope matrix effects in silicate glasses: Quantifying the role of chemical composition

Dubinina, E., Borisov, A., Wiedenbeck, M., Rocholl, A. (2021): SIMS oxygen isotope matrix effects in silicate glasses: Quantifying the role of chemical composition. - Chemical Geology, 578, 120322.
https://doi.org/10.1016/j.chemgeo.2021.120322

Item is

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Dubinina, Elena1, 2, Autor
Borisov, Alexander1, 2, Autor
Wiedenbeck, Michael2, 3, Autor              
Rocholl, A.2, 3, Autor              
Affiliations:
1External Organizations, ou_persistent22              
2GFZ SIMS Publications, Deutsches GeoForschungsZentrum, Potsdam, ou_1692888              
33.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146040              

Inhalt

einblenden:
ausblenden:
Schlagwörter: Oxygen isotopes, Compositional matrix effects, Experimental glasses, Natural glasses
 Zusammenfassung: of oxygen isotope compositions in silicate glasses was studied using a set of 27 synthesized glasses spanning a compositionally broad range of six major oxides: SiO2, TiO2, Al2O3, total FeO (FeOt), MgO and CaO. The impact of chemical composition on the IMF values was investigated using a Cameca 1280-HR during a single SIMS analytical session operated under constant instrumental conditions. The data measured were compared with the δ18O values obtained by laser fluorination gas source mass-spectrometry (LF). The offset between the δ18O(LF)and δ18O(SIMS) was found to reach up to 5‰. Our data document that SIMS oxygen isotope matrix effects in silicate glasses strongly depend on the chemical composition of silicate glasses, here the cation‑oxygen bond strength was found to have a strong influence on the IMF value. We tested a variety of models based on single oxide contents and various composition-dependent parameters, but none were fully satisfactory for predicting IMF. Neither mean atomic mass nor NBO/T (the ratio of non-bridging oxygens per tetrahedrally coordinated cation) show a strong correlation with the IMF values (R2 of 0.45 and 0.46, respectively). Among the single oxides, only the model based on the SiO2 content is useful for prediction of the IMF in silicate glasses, but this model has a large standard error (1σ = ± 0.90‰) and was also found to break down for glasses with high Na and K contents. We propose an empirical model based on the correlation of six major element oxides that shows a strong correlation with IMF (R2 = 0.98, 1σ = ± 0.40‰). This model describes the experimental data with uncertainties that are roughly a factor of two better than the correction methods proposed in earlier studies. We also investigated using the correlation between IMF and isotope I-18O index, which describes the correlation between atomic bond strength and relative oxygen isotope enrichment in silicate substances (R2 = 0.87). Although our efforts provide refinements to the SIMS determination of δ18O in natural silicate glasses, truly accurate IMF corrections will need further refinements related to the impact of alkali elements.

Details

einblenden:
ausblenden:
Sprache(n): eng - Englisch
 Datum: 2021-05-092021-05-122021
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1016/j.chemgeo.2021.120322
GFZPOF: p4 MESI
 Art des Abschluß: -

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Chemical Geology
Genre der Quelle: Zeitschrift, SCI, Scopus
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 578 Artikelnummer: 120322 Start- / Endseite: - Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals68
Publisher: Elsevier