Re-evaluation of the ages of 40Ar/39Ar sanidine standards and supereruptions in the western U.S. using a Noblesse multi-collector mass spectrometer
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- 作者：Brian R. Jicha ; brian.jicha@wisc.edu" class="auth_mail" title="E-mail the corresponding author ; Brad S. Singer ; Peter Sobol
- 关键词：40Ar/39Ar geochronology ; mass spectrometry ; standards ; Alder Creek ; supereruptions
- 刊名：Chemical Geology
- 出版年：2016
- 出版时间：1 August 2016
- 年：2016
- 卷：431
- 期：Complete
- 页码：54-66
- 全文大小：928 K
文摘
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Multi-collector mass spectrometers like the WiscAr Noblesse have led to improvement in precision/accuracy of 40Ar/39Ar data.
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The high mass resolving power of the Noblesse allows for partial resolution of interfering species at m/e 36.
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Single crystal dates from the Alder Creek sanidine are nearly identical to the age suggested by Rivera et al. (2013).
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Use of the Fish Canyon sanidine standard in 40Ar/39Ar-based refinement of the geologic timescale must be done with caution.
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High precision 40Ar/39Ar dating of sanidine is now capable of leveraging interpretation of U–Pb ID-TIMS zircon dates.