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Earth, Planets and Space

Table 3 39Ar/40Ar-dating results of the Styrian basalts

From: Intermediate field directions recorded in Pliocene basalts in Styria (Austria): evidence for cryptochron C2r.2r-1

Location

Sample

Material

Steps (n)

Spectrum

Inverse Isochron

%39Ar

Age ± 1.96 s (Ma)

MSWD (P)

TGA

 ± 1.96 s

K/Ca ± 1.96 s

Age ± 1.96 s (Ma)

MSWD (P)

Trapped 40Ar/36Ar

Spread (%)

Klöch

KN01-2B

Groundmass

5–15 (11)

70.06

2.92 ± 0.27

0.94 (0.50)

3.61 ± 0.32

0.41 ± 0.02

2.89 ± 0.92

1.04 (0.40)

299.01 ± 15.90

7.5

 

KN06-3C

Groundmass

3–10 (8)

67.74

3.11 ± 0.88

0.36 (0.93)

3.77 ± 0.99

0.80 ± 0.09

2.14 ± 1.67

0.20 (0.98)

307.33 ± 15.33

11.5

 

KN07-5D

Groundmass

2–9 (8)

93.79

2.65 ± 0.23

0.52 (0.82)

3.11 ± 0.35

0.03 ± 0.0005

2.20 ± 0.83

0.43 (0.86)

316.77 ± 35.90

18.5

 

KN08-5B

Groundmass

1–18 (18)

100

2.70 ± 0.24

0.57 (0.92)

2.82 ± 0.29

0.15 ± 0.01

2.52 ± 0.31

0.41 (0.98)

303.18 ± 5.18

35.1

Weighed mean

       

2.51 ± 0.27

0.46 (0.71)

  

Steinberg

SB0202A

Groundmass

1–13 (13)

83.07

2.39 ± 0.04

0.56 (0.88)

2.12 ± 0.18

1.78 ± 0.02

2.54 ± 0.25

0.49 (0.91)

289.12 ± 15.49

21.7

 

SB0401A

Groundmass

2–4 (3)

44.7

2.39 ± 0.05

1.23 (0.29)

2.70 ± 0.17

2.27 ± 0.04

2.36 ± 0.06

1.00 (0.00)

299.83 ± 1.93

25.9

 

SB0402A

Groundmass

1–20 (20)

100

2.88 ± 0.38

32.20 (0.00)

3.11 ± 0.11

0.06 ± 0.00

2.76 ± 0.45

40.89 (0.00)

300.44 ± 11.95

44.7

 

SB0403A

Groundmass

2–19 (18)

78.18

2.49 ± 0.07

0.44 (0.98)

3.05 ± 0.68

0.05 ± 0.00

2.45 ± 0.14

0.44 (0.97)

305.29 ± 22.93

61.6

 

SB0404A

Groundmass

1–13 (13)

100

2.16 ± 0.79

0.14 (1.00)

2.61 ± 1.29

0.03 ± 0.00

2.03 ± 0.83

0.11 (1.00)

305.13 ± 18.32

50

 

SB0405A

Groundmass

1–18 (18)

100

2.39 ± 0.38

13.34 (0.00)

2.33 ± 0.12

0.10 ± 0.00

2.25 ± 0.46

19.12 (0.00)

299.57 ± 7.69

35.4

Weighed mean

       

2.46 ± 0.12

0.72 (0.49)

  
  1. The gas release spectra with plateau age and inverse isochron ages are given. Only reliable inverse isochron ages (bold) were accepted for calculations of the weighted mean ages (bold). Location and sample names correspond to Table 1
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