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Table 4 Age data for the multiple aliquots of alunite using the modified protocol

From: Improvement of 40Ar/39Ar age determinations for Quaternary basaltic rocks by eliminating the peak suppression effect

Sample ID

Previous protocol

 

Modified protocol

Ca/K

Cl/K

Mol 39Ar (× 10−15)

%40Ar*

Age (Ma)

± 1SD

Sample ID

Ca/K

Cl/K

Mol 39Ar (× 10−15)

%40Ar*

Age (Ma)

± 1SD

427-01

3.968

− 0.447

0.001

7.8

7.20

3.10

619-01

− 0.126

− 0.051

0.024

63.5

14.83

0.25

427-02

− 1.340

− 1.645

0.001

18.6

11.56

5.10

619-02

0.022

− 0.057

0.013

78.5

14.80

0.29

427-03

1.742

− 0.366

0.001

29.3

6.03

1.90

619-03

0.101

0.199

0.018

83

14.07

0.20

427-04

0.827

0.331

0.004

27.9

10.41

0.69

619-04

− 0.003

− 0.022

0.042

77.4

15.10

0.13

427-05

− 0.062

0.527

0.002

27.1

15.63

3.54

619-05

0.020

− 0.043

0.022

81.8

14.66

0.25

427-06

− 0.126

0.283

0.002

33.4

12.63

1.63

619-06

− 0.067

− 0.017

0.012

85.9

14.64

0.35

427-07

− 0.577

− 0.104

0.002

29.6

11.70

1.34

619-07

− 0.104

− 0.102

0.017

79.9

15.94

0.23

427-08

0.321

0.114

0.016

22.7

3.21

0.33

619-08

0.063

− 0.262

0.005

88

16.51

0.97

427-09

0.701

0.093

0.007

7.9

1.46

0.61

619-09

0.067

0.012

0.010

94.8

15.47

0.34

427-10

0.209

0.041

0.006

28.3

8.60

1.30

619-10

− 0.104

− 0.047

0.021

73.7

14.94

0.21

427-11

0.081

0.097

0.010

35.6

7.07

0.73

619-11

0.069

0.063

0.018

75.1

14.82

0.26

427-12

0.591

0.270

0.006

20.6

5.97

1.08

619-12

− 0.083

− 0.009

0.016

68.5

15.21

0.22

       

619-13

0.011

− 0.004

0.019

65.6

15.32

0.19

       

619-14

− 0.008

− 0.016

0.054

65.2

14.96

0.10

       

619-15

− 0.059

− 0.017

0.016

75.3

14.58

0.28

       

619-16

− 0.117

− 0.004

0.018

80.9

14.80

0.24

   

Weighted mean (Ma)

5.02

  

Weighted mean (Ma)

14.97

   

± 1sd

2.0 (43.1%)

  

± 1sd

0.2 (1.39%)

   

MSWD

18.00

  

MSWD

3.60