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Earth, Planets and Space

Table 3 Summary of results of the IZZI-Thellier API experiments with the conventional best-fitting line interpretations

From: Paleomagnetic study of basaltic rocks from Baengnyeong Island, Korea: efficiency of the Tsunakawa–Shaw paleointensity determination on non-SD-bearing materials and implication for the early Pliocene geomagnetic field intensity

Specimen

NRM0 (Am2/kg)

Blab (μT)

θ

k

T1 − T2 (°C)

n

≥ 4

FRAC

≥ 0.78

Gap Max

≤ 0.60

β

≤ 0.100

MADfree(°)

≤ 5.0

DANG (°)

≤ 10.0

npTRM

≥ 2

DRATS

≤ 22

SCAT

k′

|k′| ≤ 0.164

Banc (μT)*

B1A-1-2

7.92E–04

15.0

28

1.243

150–600

13

0.74

0.14

0.165

5.5

6.8

6

11.2

Fail

1.273

9.5?

     

150–500

9

0.54

0.15

0.121

6.0

9.8

4

4.2

Fail

0.776

35.2?

     

500–600

5

0.20

0.54

0.055

7.0

3.1

2

11.2

Pass

− 0.358

3.4?

B1B-1-2

1.05E–03

15.0

34

1.167

150–600

13

0.82

0.14

0.149

4.7

5.0

6

2.5

Fail

1.188

9.2?

     

150–500

9

0.57

0.17

0.090

5.0

5.8

4

0.5

Fail

0.531

29.2?

     

500–600

5

0.25

0.48

0.084

11.1

2.0

2

2.5

Pass

− 0.577

3.4?

B1B-2-2

9.53E–04

15.0

54

1.191

225–600

12

0.70

0.14

0.163

5.3

5.9

6

17.6

Fail

1.217

9.0?

     

225–500

8

0.48

0.17

0.116

5.5

6.1

4

1.9

Fail

0.600

27.7?

     

500–600

5

0.22

0.44

0.125

13.4

3.9

2

17.6

Pass

0.000

3.3?

B1D-1-2

9.47E–04

15.0

99

1.123

150–600

13

0.79

0.14

0.149

4.8

7.6

6

18.5

Fail

1.162

12.2?

     

150–520

10

0.60

0.19

0.091

4.8

10.3

4

7.5

Pass

0.507

31.8?

     

520–600

4

0.20

0.36

0.034

11.8

2.7

2

18.5

Fail

− 0.144

4.0?

B1E-1-2

8.49E–04

15.0

70

1.142

150–600

13

0.75

0.12

0.144

4.9

7.7

6

20.4

Fail

1.165

11.5?

     

150–500

9

0.49

0.18

0.044

5.0

8.2

4

1.1

Pass

0.279

33.3?

     

500–600

5

0.26

0.32

0.109

14.1

7.4

2

20.4

Pass

0.566

4.4?

B1G-1-2

9.00E–04

15.0

50

1.163

0–600

14

0.94

0.11

0.152

5.1

7.6

6

18.0

Fail

1.163

11.9?

     

0–500

10

0.66

0.16

0.051

4.4

8.8

4

2.2

Pass

0.235

32.7?

     

500–600

5

0.28

0.32

0.124

16.3

3.4

2

18.0

Pass

0.332

3.7?

B2C-1-2

8.02E–04

15.0

84

0.720

225–600

12

0.74

0.15

0.109

7.0

6.4

6

6.9

Fail

0.740

9.1?

     

225–550

10

0.56

0.14

0.104

8.4

10.0

5

10.0

Pass

0.362

14.3?

     

500–600

5

0.32

0.35

0.097

9.8

6.1

2

6.9

Pass

0.505

5.3?

B2C-2-2

1.29E–03

15.0

43

0.993

150–600

13

0.75

0.17

0.138

8.3

8.7

6

7.4

Fail

0.958

11.9?

     

0–520

11

0.77

0.31

0.115

5.1

15.9

4

20.6

Fail

0.681

30.6?

     

500–600

5

0.25

0.38

0.078

5.1

3.0

2

7.4

Pass

0.441

5.9?

  1. All of the analyzed specimens have no API estimate that meet our optimized selection criteria but some of the interpretations for specimens are shown. NRM0, initial NRM intensity. Blab, laboratory DC field during TRM acquisitions (in-field steps). θ, the angle between directions of the field in which NRM of the sample was produced and Blab. k, a measure of the curvature for all temperature steps (Paterson 2011). T1 − T2, temperature interval used in the determination. For the explanations of statistics of n, FRAC, Gap Max, b, MADfree, DANG, npTRM, DRATS, SCAT and k′, see “IZZI-Thellier (IZZI-T) method with pTRM checks” section. Note threshold values of the statistics for the selection criteria are documented under the column headings. Banc*, the value of the determined slope of NRM/TRM data for the selected temperature steps in the Arai diagram multiplied by the Blab value
  2. Letters with italics denote the values failing to meet the corresponding selection criterion
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