The laboratory has facilities for noble-gas analysis, consisting of ultrahigh vacuum purification system and furnace.
The K-Ar age is determined by unspiked method
(Ryu et al., 2013)
for young rocks (e.g., Holocene volcanic rocks)
and spiked method (Nagao et al., 1996; Feyissa et al., 2017)
for relatively older rocks (0.1 to 100 Ma).
Methods and techniques:
Ryu et al. (2013).
K-Ar analyses of the post-caldera lavas of Bratan volcano in Bali Island,
Indonesia - Ar isotope mass fractionation to light isotope enrichment,
Journal of Volcanology and Geothermal Research, 264, 107-116.
Nagao et al. (1996).
Ar Isotope Analysis for K-Ar Dating Using Two Modified-VG5400 Mass Spectrometers—I: Isotope Dilution Method,
Journal of the Mass Spectrometry Society of Japan, 44(1), 39-61.
Feyissa et al. (2017).
Petrologic and geochemical characterization of rift-related magmatism at the northernmost Main Ethiopian Rift:
Implications for plume-lithosphere interaction and the evolution of rift mantle sources,
Lithos, 282-283, 240-261 (2017).
Gas extraction furnace (~1500 ˚C with Ta heater and Mo crucible)
Residual gas deterctor (Q-pole mass analyzer)
Determination of waters in rocks (H2O+ and H2O-) with precision 1% (1σ)
Determination of ferrous iron with precision 1% (1σ).
Li et al. (2020)
Various Ages of Recycled Materialin the Source of Cenozoic Basalts in Southeast China: Implications for the Role of the Hainan Plume,
Journal of Petrology, egaa060.
Feyissa et al. (2019).
Transition from plume-driven to plate-driven magmatism in the evolution of the Main Ethiopian Rift,
Journal of Petrology, 60(8), 1681-1715.
Pineda‐Velasco et al. (2018).
Production of High-Sr Andesite and Dacite Magmas by Melting of Subducting Oceaninc Lithosphere at Propagating Slab Tears,
Journal of Geophysical Research: Solid Earth, 123(5), 3698-3728.