Sample name

Geologic unit name

K (wt.%)

Radiogenic⁴⁰Ar

K-Ar age (Ma)

Non-radiogenic⁴⁰Ar(%)

GLL2001

Gassan upper summit lavas

1.864 ± 0.037

3.71 ± 0.17 3.80 ± 0.16

0.51 ± 0.03

0.53 ± 0.02

av.0.52 ± 0.02

70.1 69.1

GNL3303

Gassan upper summit lavas

2.394 ± 0.048

3.94 ± 0.54 3.90 ± 0.54

0.42 ± 0.06

0.42 ± 0.06

av.0.42 ± 0.04

89.3 89.2

GPL82704

Gassan upper summit lavas

1.984 ± 0.040

4.23 ± 0.13 4.34 ± 0.14

0.55 ± 0.02

0.56 ± 0.02

av.0.56 ± 0.02

60.8 59.7

GNL1101

Gassan upper north lavas

1.959 ± 0.039

5.15 ± 1.01

0.68 ± 0.13

92.4

GLL082804

Gassan lower lavas

1.946 ± 0.039

4.53 ± 1.46 4.48 ± 1.47

0.60 ± 0.19 0.59 ± 0.19 av.0.60 ± 0.13

95.3 95.3

89092507

Gassan lower lavas

1.779 ± 0.036

5.09 ± 0.39

0.74 ± 0.06

81.7