FF52-9140 K-feldspar (J = 0.000433) Total gas age = 1.10 ± 0.02 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁷Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age ± 1s

(Ma)

1

450

31.21

1.32E±00

9.81E-02

2.77E-15

8.60

7.40

1.80 ± 0.12

2

550

2.851

2.78E-01

7.88E-03

9.03E-16

11.4

18.8

0.42 ± 0.26

3

600

3.213

1.30E±00

8.88E-03

1.10E-15

14.8

20.6

0.52 ± 0.12

4

700

4.316

4.01E-02

1.20E-02

2.00E-15

21.0

17.5

0.59 ± 0.07

5

800

5.661

5.95E-01

1.64E-02

1.94E-15

27.0

14.7

0.65 ± 0.07

6

900

5.028

9.52E-02

1.30E-02

2.68E-15

35.3

23.4

0.92 ± 0.05

7

1000

4.515

3.16E-02

1.12E-02

1.71E-14

88.4

26.7

0.94 ± 0.02

8

1100

9.603

8.38E-01

2.74E-02

2.45E-15

96.0

16.2

1.21 ± 0.07

9

1250

21.63

7.54E±00

6.40E-02

7.42E-16

98.3

14.7

2.49 ± 0.23

10

1350

35.97

1.56E±01

1.05E-01

3.23E-16

99.3

16.4

4.64 ± 0.51

11

1450

61.73

1.02E±01

1.62E-01

1.94E-16

100

23.4

11.33 ± 0.89