GDC-5-7800 K-feldspar (J = 0.000404) Total gas age = 0.87 ± 0.09 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age + 1s

(Ma)

1

450

250.4

8.04E-01

1.56E-15

0.227

5.05

9.22 ± 2.58

2

450

166.0

5.72E-01

5.28E-16

0.304

-1.74

0.00 ± 0.00

3

500

240.4

7.68E-01

9.19E-16

0.438

5.64

9.89 ± 7.08

4

500

93.15

3.84E-01

3.91E-16

0.495

-21.5

-

5

550

52.02

1.48E-01

3.89E-15

1.06

15.9

6.06 ± 0.51

6

550

47.45

1.51E-01

2.15E-15

1.37

5.83

2.03 ± 0.85

7

600

28.45

8.08E-02

8.83E-15

2.66

16.0

3.32 ± 0.30

8

600

26.00

8.27E-02

3.17E-15

3.13

5.92

1.13 ± 0.53

9

650

19.43

5.41E-02

5.52E-15

3.93

17.6

2.50 ± 0.34

10

650

18.66

5.99E-02

5.02E-15

4.66

5.05

0.69 ± 0.38

11

700

49.66

1.61E-01

1.76E-14

7.22

4.17

1.51 ± 0.43

12

700

8.258

2.55E-02

1.08E-14

8.81

8.68

0.53 ± 0.13

13

750

6.148

1.74E-02

1.81E-14

11.4

16.2

0.73 ± 0.08

14

750

5.927

1.68E-02

2.54E-14

15.1

16.0

0.69 ± 0.06

15

800

5.671

1.61E-02

1.79E-14

17.8

15.7

0.66 ± 0.08

16

850

5.448

1.63E-02

1.51E-14

20.0

11.4

0.46 ± 0.09

17

900

2.928

7.47E-03

5.52E-14

28.0

24.1

0.52 ± 0.03

18

950

3.562

9.20E-03

4.96E-14

35.2

23.3

0.61 ± 0.03

19

1000

3.071

7.43E-03

4.26E-14

41.5

28.0

0.63 ± 0.03

20

1050

3.062

6.83E-03

1.04E-13

56.6

33.6

0.75 ± 0.02

21

1100

2.602

5.10E-03

8.10E-14

68.5

41.5

0.79 ± 0.02

22

1100

4.290

1.07E-02

5.86E-14

77.0

26.2

0.82 ± 0.03

23

1100

9.639

2.87E-02

4.35E-14

83.3

12.0

0.85 ± 0.06

24

1200

3.166

6.64E-03

8.41E-14

95.6

37.6

0.87 ± 0.02

25

1233

14.88

4.61E-02

1.56E-14

97.9

8.43

0.92 ± 0.16

26

1266

27.37

8.52E-02

5.98E-15

98.7

7.97

1.60 ± 0.31

27

1350

14.75

4.33E-02

8.69E-15

100

13.2

1.42 ± 0.20