FF52-9040 Biotite (J = 0.000433) Total gas age = 1.35 ± 0.02 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁷Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age ± 1s

(Ma)

1

450

163.5

7.02E-01

5.16E-01

1.00E-15

0.40

6.80

8.62 ± 0.77

2

500

102.7

3.54E-01

3.29E-01

2.01E-15

1.20

5.40

4.34 ± 0.40

3

525

60.12

1.78E-01

1.92E-01

3.77E-15

2.70

5.40

2.54 ± 0.22

4

550

30.19

9.05E-02

9.39E-02

7.53E-15

5.70

8.10

1.92 ± 0.11

5

575

17.92

6.70E-02

5.42E-02

1.03E-14

9.80

10.6

1.48 ± 0.07

6

600

11.33

4.43E-02

3.27E-02

1.56E-14

16.0

14.7

1.31 ± 0.05

7

650

7.267

2.09E-02

1.91E-02

3.29E-14

29.1

22.4

1.27 ± 0.03

8

700

5.729

7.41E-02

1.36E-02

2.54E-14

39.2

29.7

1.33 ± 0.03

9

750

6.119

1.33E-01

1.47E-02

2.11E-14

47.6

28.9

1.38 ± 0.03

10

800

9.897

3.11E-02

2.78E-02

2.23E-14

56.5

17.0

1.32 ± 0.04

11

850

15.12

1.18E-02

4.54E-02

3.79E-14

71.6

11.3

1.34 ± 0.05

12

875

11.06

9.48E-02

3.29E-02

3.67E-14

86.2

12.2

1.06 ± 0.03

13

900

5.796

1.38E-02

1.49E-02

3.01E-14

98.2

23.9

1.08 ± 0.02

14

925

7.389

3.35E±00

2.21E-02

1.76E-15

98.9

14.3

0.83 ± 0.30

15

1000

8.420

7.95E-01

2.39E-02

2.26E-15

99.8

16.8

1.11 ± 0.26

16

1200

48.65

1.63E±01

1.57E-01

5.02E-16

100

6.60

2.53 ± 1.49