Abstract
Ar/39Ar dating technique has been used to determine the age for low-temperature geological event. The introduction of the multiple collectors and the improvement in sensitivity in the noble gas mass spectrometry enable the single-grain 40Ar/39Ar age determination. The protocol for 40Ar/39Ar age determination and performance of the new high-sensitivity noble gas mass spectrometer (ARGUS VI) combined with the infra-red laser heating device are shown. ARGUS VI can produce the precise single-grain 40Ar/39Ar age of 28.4 ± 0.5 Ma (1σ, MSWD = 138, n = 24) within the recommended values of Fisher Canyon sanidine (FCS) (28.294 ± 0.036 Ma). For the young samples, we can also get the age of 1.185 ± 0.004 Ma (1σ, MSWD = 6.05, n = 26) of Alder Creek sanidine (ACS), equivalent to the recommended age (1.193 ± 0.001 Ma).
Highlights
Ar/39Ar dating technique has been used to determine the age for low-temperature geological event
We describe the 40Ar/39Ar age dating protocol using the newly installed multi-collector noble gas mass spectrometer in Korea Basic Science Institute (KBSI) and report its performance for some geological samples
The measured value of Fisher Canyon sanidine (FCS) (Figure 3a) is 28.4 ± 0.5 Ma (1σ, MSWD = 138, n = 24) which is consistent with recommended value (28.294 ± 0.036 Ma: Renne et al 2010) within uncertainty
Summary
Ar/39Ar dating technique has been used to determine the age for low-temperature geological event. The introduction of laser heating/ablation technique enables to measure Ar age of single grains and monitor the variation in Ar isotope within minerals. We describe the 40Ar/39Ar age dating protocol using the newly installed multi-collector noble gas mass spectrometer in Korea Basic Science Institute (KBSI) and report its performance for some geological samples.
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