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Earth, Planets and Space

Table 3 Thellier–Coe paleointensity results for sites PO-1 and PO-2 (pyroclastic density currents)

From: A comprehensive paleomagnetic study from the last Plinian eruptions of Popocatepetl volcano: absolute chronology of lavas and estimation of emplacement temperatures of PDCs

Specimen

ΔT (°C)

N

β

f

g

q

δ(CK)

δ(TR)

MADanc

Class

Hraw (μT)

± σH (μT)

f

Hcrc (μT)

Site PO-1

Clast 1

1B

250–560

9

0.05

0.52

0.60

7.7

1.4

5.9

1.5

C

65.41

2.68

1.00

65.18

2B

250–560

9

0.07

0.42

0.68

4.1

4.4

2.9

1.2

B

69.93

4.83

1.02

66.59

3A

400–560

6

0.04

0.29

0.54

4.0

4.7

5.7

1.4

C

73.74

2.91

1.00

73.37

         

Mean =

 

69.7

  

69.2

         

1σ =

 

4.2

  

4.2

Clast 2

4A

250–560

9

0.01

0.50

0.59

3.0

3.2

4.4

1.1

B

44.29

1.39

1.00

44.29

4B

250–560

9

0.04

0.57

0.55

7.7

3.6

4.8

0.9

A

41.23

1.86

1.00

41.23

5A

250–560

9

0.05

0.69

0.44

5.9

2.6

5.3

1.1

B

44.32

1.67

1.08

41.01

6A

300–560

8

0.03

0.87

0.77

19.0

0.4

8.6

1.1

C

42.15

2.19

1.02

41.50

8A

250–560

9

0.03

0.88

0.82

26.8

9.0

6.8

1.7

C

42.42

1.30

1.00

42.51

9A

250–560

9

0.05

0.91

0.81

15.4

1.6

9.7

0.9

C

45.17

2.40

1.00

45.17

         

Mean =

 

44.5

  

43.8

         

1σ =

 

3.7

  

2.8

Site PO-2

Clast 1

10A

200–540

8

0.06

0.72

0.77

9.1

18.0

5.5

1.3

C

57.7

3.84

1.00

57.7

11A

150–515

7

0.12

0.36

0.66

1.9

0.5

2.8

1.2

B

57.6

7.1

1.01

57.0

12A

200–515

9

0.05

0.37

0.67

4.6

7.6

2.8

1.0

B

58.7

3.14

1.04

56.4

13A

200–515

8

0.10

0.38

0.65

2.5

4.2

4.5

0.9

B

59.2

5.93

1.05

56.4

14A

150–515

8

0.12

0.32

0.64

1.8

3.7

6.5

0.7

B

50.1

5.91

1.01

49.8

         

Mean =

 

56.4

  

54.9

         

1σ =

 

4.1

  

3.4

Clast 2

15A

200–515

9

0.07

0.35

0.78

3.9

6.3

1.5

1.8

B

48.05

3.33

1.04

46.2

16B

300–560

9

0.09

0.35

0.79

3.0

42.9

3.6

1.5

C

50.00

4.67

1.05

47.6

17A

250–560

7

0.08

0.31

0.85

3.1

62.0

4.4

1.1

C

42.74

3.59

1.01

42.3

18A

N/R

–

–

–

–

–

–

–

–

 

–

–

 

–

         

Mean =

 

46.9

  

45.4

         

1σ =

 

3.8

  

2.8

Clast 3

19B

350–540

7

0.07

0.37

0.82

4.0

9.4

5.7

4.1

B

68.68

4.28

1.05

65.4

20A

200–540

9

0.05

0.49

0.87

8.3

7.6

4.9

2.1

B

64.10

1.46

1.06

60.5

20B

N/R

–

–

–

–

–

    

–

–

–

–

         

Mean =

 

66.4

  

62.9

         

1σ =

 

3.2

  

3.5

  1. Data in italics not used for PI calculations
  2. ΔT temperature interval used for the intensity determination, N number of heating steps used for the intensity determination, β = σm/m, f fraction of extrapolated NRM used for intensity determination, g gap factor, q quality factor as defined by Coe et al. (1978), δ(CK), δ(TR), MADanc and class as defined by Leonhardt et al. (2004), Hraw raw archeointensity value, σH standard deviation of H, f cooling rate correction factor, Hcrc cooling rate-corrected archeointensity
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