Table 2 40Ar/39Ar analytical result of basaltic lava flow, P2-Lrl.

From: Origin of clay minerals in Early Eocene volcanic paleosols on King George Island, Maritime Antarctica

Laser output

40Ar/39Ar

37Ar/39Ar

36Ar/39Ar

K/Ca

40Ar*

39ArK

40Ar*/39ArK

Age (±1 s)

(×10−3)

(%)

fraction (%)

(Ma)

Sample ID:P2-Lrl

 

Laboratory ID: C17004

Neutron irradiation ID: PO-5

J = 0.000999

1.4%

190.81 ± 1.48

0.535 ± 0.011

590.75 ± 5.02

1.10

8.53

1.58

16.29 ± 0.99

29.13 ± 1.76

1.6%

36.36 ± 0.35

0.520 ± 0.005

32.95 ± 0.33

1.13

73.34

6.28

26.68 ± 0.31

47.45 ± 0.57

1.8%

29.11 ± 0.12

0.515 ± 0.004

5.21 ± 0.05

1.14

94.85

14.21

27.62 ± 0.11

49.11 ± 0.28

2.0%

28.86 ± 0.14

0.562 ± 0.004

2.58 ± 0.04

1.05

97.51

16.67

28.15 ± 0.14

50.03 ± 0.31

2.2%

28.74 ± 0.09

0.667 ± 0.004

2.05 ± 0.03

0.88

98.08

18.11

28.20 ± 0.09

50.13 ± 0.25

2.4%

28.61 ± 0.08

0.818 ± 0.004

1.14 ± 0.04

0.72

99.05

14.72

28.35 ± 0.08

50.38 ± 0.24

2.6%

28.38 ± 0.12

0.895 ± 0.008

1.78 ± 0.06

0.66

98.40

9.40

27.94 ± 0.12

49.67 ± 0.29

2.9%

28.23 ± 0.15

0.967±0.007

4.50 ± 0.07

0.61

95.57

9.57

27.00 ± 0.15

48.02 ± 0.32

3.3%

29.34 ± 0.15

1.179 ± 0.009

12.17 ± 0.13

0.50

88.06

7.44

25.86 ± 0.14

46.01 ± 0.31

3.9%

35.04 ± 0.20

2.565 ± 0.023

45.19 ± 0.48

0.23

62.48

2.00

21.93 ± 0.21

39.09±0.40

    

Plateau age (Plateau: 3 steps from 2.0% to 2.4%)

50.21 ± 0.15

    

Total gas age

48.74 ± 0.01

    

Normal isochron age (of plateau steps)

50.25 ± 0.33

    

Inverse isochron age (of plateau steps)

50.61 ± 0.33

  1. #100% corresponds to 50 W output of CO2 laser. All the errors indicate 1 sigma error. 40Ar*: radiogenic 40Ar.
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