GDC-5-7240 Biotite (J = 0.000430) Total gas age = 0.92 ± 0.04 Ma

step

T

(° C)

⁴⁰Ar/³⁹Ar

³⁷Ar/³⁹Ar

³⁶Ar/³⁹Ar

³⁹Ar

(mol)

S³⁹Ar

(%)

⁴⁰Ar*

(%)

Age ± 1s

(Ma)

1

450

186.3

2.02E±00

6.26E-01

1.14E-15

1.60

0.70

1.05 ± 0.70

2

500

62.83

2.27E±00

2.09E-01

4.65E-15

8.10

1.80

0.88 ± 0.25

3

525

14.25

1.04E±00

4.43E-02

3.43E-15

12.9

8.50

0.94 ± 0.23

4

550

10.03

7.34E-01

3.03E-02

4.94E-15

19.8

11.2

0.87 ± 0.16

5

600

10.63

6.86E-01

3.21E-02

7.37E-15

30.1

11.1

0.92 ± 0.11

6

650

9.399

2.87E±00

2.85E-02

9.95E-15

44.0

12.2

0.89 ± 0.08

7

700

6.391

4.65E±00

1.87E-02

9.37E-15

57.1

17.8

0.89 ± 0.09

8

750

5.471

5.12E-01

1.48E-02

7.08E-15

67.0

20.7

0.88 ± 0.11

9

800

5.237

2.51E±00

1.38E-02

9.66E-15

80.5

25.2

1.02 ± 0.08

10

850

5.771

6.12E-01

1.56E-02

9.23E-15

93.4

20.9

0.94 ± 0.04

11

900

8.766

1.06E±00

2.59E-02

1.43E-15

95.4

13.5

0.92 ± 0.23

12

1000

11.02

8.77E-01

3.47E-02

1.72E-15

97.8

7.60

0.65 ± 0.19

13

1200

9.891

9.75E-01

2.94E-02

1.57E-15

100

12.6

0.97 ± 0.21