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Table 2 40Ar/39Ar stepwise heating data for sample MC301 (see Fig. 9)

From: The 3D interplay between folding and faulting in a syn-orogenic extensional system: the Simplon Fault Zone in the Central Alps (Switzerland and Italy)

Step

T (°C)

40/39

38/39

37/39

36/39

36/40

39K/38Cl

37Ca/39K

39 %

%40*

40*/39K

Age (Ma)

±

MC301 Biotite

J: 0.003468

1

400

6.21

0.01870

–

0.0128963

0.002078

–

2.23E−07

22.61

40.4

2.501

15.6

0.7

2

540

2.44

0.01730

–

0.0010309

0.000422

–

1.87E−07

49.58

89.3

2.170

13.5

0.8

3

622

2.39

0.01590

–

0.0011824

0.000494

–

2.68E−07

68.43

85.8

2.038

12.7

1.0

4

2400

2.33

0.01750

0.000178

0.0005096

0.000218

–

7.84E−04

100

93.8

2.175

13.6

0.7

           

Total age: 13.8 ± 1.9 Ma

MC301 Muscovite

J: 0.003471

1

421

1.97

0.01210

–

0.00055193

0.0002807

–

1.94E−07

3.54

91.9

1.789

11.2

1.1

2

470

1.69

0.01180

–

0.00015143

0.0000894

–

7.22E−08

13.15

97.4

1.627

10.2

0.2

3

512

1.67

0.01150

–

0.00010631

0.0000636

–

6.50E−08

23.83

98.2

1.619

10.1

0.1

4

578

1.68

0.01230

–

0.00001440

0.0000100

–

2.57E−08

50.86

99.7

1.660

10.4

0.1

5

605

1.71

0.01220

0.000391

–

–

–

1.53E−03

75.38

100.0

1.693

10.6

0.1

6

620

1.73

0.01170

0.000548

0.00023660

0.0001365

–

2.15E−03

86.18

96.1

1.645

10.3

0.3

7

655

1.76

0.00919

0.001690

0.00087693

0.0004974

–

6.61E−03

88.55

85.7

1.485

9.3

1.0

8

1555

1.74

0.01070

0.000086

0.00006350

0.0000364

–

3.36E−04

100

99.0

1.698

10.6

0.2

           

Total age: 10.4 ± 0.2 Ma