Economic and Environmental Geology

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Table. 2.

Table. 2.

Result of Ar-Ar age dating of volcanic rocks from Hyeongjaeseom, Jeju Island

ID Weighted Plateau
Age(ka) 2 s.d. %39Ar Steps3 MSWD
HJ-01 48.9 22.1 71.0 13/19 1.15
HJ-02* 9.2 3.6 100.0 41/41 0.58
ID Normal Isochron
Age(ka) 2 s.d. 40Ar/36Ar i 2 s.d MSWD
HJ-01
HJ-02* 1.8 6.3 301.12 1.76 0.38
ID Inverse Isochron
Age(ka) 2 s.d. 40Ar/36Ar i 2 s.d MSWD
HJ-01
HJ-02* 1.7 0.9 301.17 1.77 0.38

Samples irradiated at OSU TRIGA reactor for 6 hours at 1MW power. Neutron flux measured using FCT-3 biotite monitor(Renne et al., 1998).

Material-groundmass; Experiment method - incremental heating; extraction method - bulk laser heating.

Plateau age includes % 39Ar and number of steps in the plateau (steps in plateau / total steps); *Two runs combined.

Econ. Environ. Geol. 2021;54:187-97 https://doi.org/10.9719/EEG.2021.54.2.187
© 2021 Econ. Environ. Geol.