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Table 1 Whole-rock compositions of representative samples from the Hachijo-Nishiyama volcano

From: Pre-eruption magmatic processes and magma plumbing system at Hachijo-Nishiyama volcano, Izu–Bonin arc, Japan

Sample

#28-1

#55-1

#121-2

#112-1

#89-1

#171-2

#93-1

#2-1

#168-1

#102-1

Unit

KdL

SL

SL

OkL

AzL

DbL

OsL

IdL

FrL

FjS

Major elements, wt.%

 SiO2

51.24

51.03

55.08

50.64

50.29

51.88

51.45

50.93

52.78

52.29

 TiO2

1.42

1.46

1.64

1.41

1.43

1.48

1.67

1.41

1.56

1.48

 Al2O3

16.60

15.31

13.99

16.41

16.96

15.42

14.31

17.28

14.62

15.83

 Fe2O3*

14.15

15.38

14.82

13.81

13.97

14.44

15.99

13.58

14.69

14.31

 MnO

0.21

0.23

0.24

0.20

0.20

0.22

0.23

0.20

0.22

0.21

 MgO

3.64

4.46

3.16

4.50

4.18

3.89

4.60

4.10

3.76

3.79

 CaO

10.14

10.02

7.89

10.62

10.65

9.58

9.39

10.61

9.10

9.57

 Na2O

2.38

2.07

2.76

2.09

2.06

2.33

2.18

2.13

2.46

2.29

 K2O

0.33

0.23

0.55

0.34

0.35

0.42

0.44

0.35

0.47

0.43

 P2O5

0.14

0.12

0.23

0.15

0.15

0.17

0.18

0.15

0.17

0.17

 Total

100.23

100.32

100.36

100.17

100.26

99.84

100.44

100.74

99.86

100.37

Trace elements, ppm

 Sc**

42.6

49.1

44.2

44.4

43.0

44.0

49.5

41.4

48.1

44.0

 V**

481

517

248

396

398

400

448

395

400

397

 Cr**

18.8

35.0

4.7

31.8

16.8

15.6

17.8

15.3

17.6

14.4

 Co**

43.8

49.3

45.4

45.1

44.8

46.8

49.9

43.9

46.3

45.4

 Ni**

17.4

23.8

6.6

18.7

15.7

12.1

16.2

14.8

11.7

11.9

 Rb**

6.4

6.7

6.5

7.2

6.8

7.8

7.0

8.4

7.0

7.4

 Sr**

192

177

193

181

181

176

166

179

176

177

 Y**

29.4

28.3

47.6

30.6

31.7

35.5

37.5

31.2

38.2

35.7

 Zr**

50.0

45.2

78.6

53.6

54.7

63.2

63.5

53.6

67.7

63.5

 Ba**

124

106

201

137

140

166

166

141

176

163

 Nb

0.41

0.34

0.65

0.43

0.44

0.51

0.53

0.43

0.54

0.51

 Cs

0.42

0.20

0.72

0.46

0.47

0.58

0.63

0.51

0.59

0.61

 La

2.51

1.96

4.11

2.58

2.61

3.02

3.18

2.59

3.29

3.03

 Ce

7.83

6.3

12.8

8.06

8.17

9.60

10.0

8.21

10.4

9.59

 Pr

1.45

1.19

2.39

1.49

1.52

1.77

1.88

1.52

1.93

1.79

 Nd

8.65

7.3

14.1

8.86

9.06

10.6

11.1

9.08

11.4

10.6

 Sm

3.21

2.84

5.19

3.31

3.37

3.89

4.16

3.40

4.19

3.94

 Eu

1.23

1.11

1.75

1.18

1.20

1.33

1.42

1.19

1.39

1.31

 Gd

4.68

4.12

7.25

4.73

4.81

5.46

5.78

4.75

5.85

5.47

 Tb

0.84

0.75

1.28

0.84

0.85

0.98

1.03

0.85

1.04

0.98

 Dy

5.68

5.15

8.68

5.63

5.72

6.56

6.96

5.74

7.03

6.58

 Ho

1.23

1.10

1.88

1.23

1.24

1.41

1.50

1.24

1.54

1.42

 Er

3.68

3.32

5.64

3.68

3.71

4.26

4.52

3.68

4.58

4.28

 Tm

0.53

0.49

0.82

0.54

0.54

0.61

0.66

0.54

0.67

0.63

 Yb

3.55

3.29

5.47

3.50

3.55

4.17

4.33

3.59

4.49

4.16

 Lu

0.53

0.50

0.83

0.53

0.54

0.62

0.66

0.54

0.68

0.62

 Hf

1.70

1.53

2.86

1.83

1.85

2.21

2.31

1.87

2.41

2.24

 Ta

0.03

0.03

0.05

0.03

0.03

0.04

0.04

0.03

0.04

0.04

 Pb

2.45

1.76

3.56

2.38

2.38

3.87

2.80

2.36

2.92

2.76

 Th

0.20

0.14

0.33

0.21

0.21

0.25

0.26

0.21

0.27

0.24

 U

0.13

0.10

0.20

0.12

0.12

0.15

0.15

0.13

0.17

0.16

Isotopes

 87Sr/86Sr

0.703543 ± 8

0.703552 ± 8

0.703543 ± 9

0.703543 ± 12

0.703536 ± 6

0.703552 ± 10

0.703544 ± 13

0.703538 ± 16

0.703537 ± 9

0.703552 ± 13

 143Nd/144Nd

0.513099 ± 7

0.513099 ± 13

0.513103 ± 5

0.513105 ± 5

0.513103 ± 3

0.513102 ± 5

0.513098 ± 5

0.513099 ± 5

0.513098 ± 3

0.513099 ± 5

 206Pb/204Pb

18.4080 ± 6

18.4065 ± 6

18.4075 ± 4

18.4110 ± 5

18.4121 ± 4

18.4110 ± 7

18.4108 ± 4

18.4112 ± 6

18.4095 ± 5

18.4089 ± 5

 207Pb/204Pb

15.5467 ± 6

15.5442 ± 5

15.5453 ± 3

15.5455 ± 6

15.5464 ± 4

15.5468 ± 5

15.5462 ± 4

15.5456 ± 4

15.5464 ± 5

15.5460 ± 4

 208Pb/204Pb

38.3081 ± 14

38.3011 ± 14

38.3026 ± 9

38.3037 ± 17

38.3074 ± 10

38.3110 ± 14

38.3071 ± 10

38.3058 ± 12

38.3073 ± 15

38.3063 ± 11

  1. Fe2O3* total Fe as Fe2O3
  2. **Obtained by XRF