GDC-5-7240 K-felspar (J = 0.000431) Total gas age = 0.83 ± 0.03 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁷Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age ± 1s

(Ma)

1

450

46.18

6.26E-01

1.48E-01

1.92E-15

7.20

5.70

2.04 ± 0.21

2

500

10.41

8.96E-01

3.26E-02

1.28E-15

12.0

8.10

0.66 ± 0.25

3

550

9.430

2.81E±00

3.08E-02

1.23E-15

16.6

5.30

0.39 ± 0.26

4

600

9.220

1.01E±00

2.68E-02

1.15E-15

20.9

14.7

1.06 ± 0.28

5

700

10.22

6.68E-01

3.18E-02

1.74E-15

27.4

8.30

0.66 ± 0.18

6

800

3.558

4.66E-02

8.92E-03

9.67E-15

63.6

25.9

0.72 ± 0.02

7

850

1.966

1.03E-01

3.69E-03

6.28E-15

87.1

44.7

0.68 ± 0.03

8

900

2.729

3.61E-01

6.09E-03

1.79E-15

93.8

34.7

0.74 ± 0.10

9

1000

6.095

6.30E-01

1.68E-02

1.02E-15

97.6

19.2

0.91 ± 0.17

10

1100

18.59

1.61E±01

5.96E-02

2.67E-16

98.6

10.5

1.54 ± 0.67

11

1250

25.06

3.12E±00

8.16E-02

2.14E-16

99.4

4.60

0.89 ± 0.84

12

1400

42.66

2.13E±01

1.32E-01

1.60E-16

100

11.4

3.81 ± 1.20