Improvement of 40Ar/39Ar age determinations for Quaternary basaltic rocks by eliminating the peak suppression effect
| Autor: | Jeongmin Kim, In-Hwa Cho |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Analytical chemistry lcsh:Analytical chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Mass spectrometry 01 natural sciences General Biochemistry Genetics and Molecular Biology 40Ar/39Ar age Quaternary lcsh:Chemistry General Materials Science Sample preparation General Environmental Science geography Getters geography.geographical_feature_category Argon lcsh:QD71-142 Isotope 010401 analytical chemistry Noble gas Isotopes of argon Noble gas mass spectrometer General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Volcanic rock Peak suppression chemistry lcsh:QD1-999 Yield (chemistry) 0210 nano-technology |
| Zdroj: | Journal of Analytical Science and Technology, Vol 11, Iss 1, Pp 1-13 (2020) |
| ISSN: | 2093-3371 |
| Popis: | Background The peak suppression effect, which suppresses the argon isotope signal due to the incomplete cleaning of gas from geological samples during measurement, is found in volatile-rich samples using the ARGUS VI noble gas mass spectrometer and its sample preparation system. Such effect hampers getting the precise isotope ratio essential for the 40Ar/39Ar age calculation. Findings The addition of one hot-getter and three room-temperature getters to the sample preparation system can effectively eliminate the peak suppression effect for several milligrams of sample during argon measurement to yield highly plausible 40Ar/39Ar ages of Quaternary volcanic rocks. Conclusions The modified preparation system makes it possible to get highly precise zero-time isotope signals, and thereby a geologically plausible 40Ar/39Ar age, especially for a small amount of volatile-rich samples. |
| Databáze: | OpenAIRE |
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