Western Senegal

Cape Verde Islands

Elements (wt%)

Tertiary lavas (n = 34)

Quaternary lavas (n = 9)

Quaternary

Tertiary

Fogo (active Volcan)

[n = 6]

Sal (50 Ma)

[n = 3]

Sao Nicolau

(n = 7)

Sao Vicente

(n = 7)

Santiago

(n = 5)

SiO₂

39.9 - 51.7

40.1 - 53.6

40.65 - 42.47

35.67 - 38.89

39.97 - 44.47

38.54 - 44.47

38.08 - 42.96

Al₂O₃

10.75 - 16.05

9.31 - 14.8

13.31 - 15.71

8.25 - 10.93

11.88 - 13.87

8.38 - 13.34

10.22 - 15.49

Fe₂O₃

10.1 - 13.9

10.3 - 11.63

13.06 - 14.19

12.20 - 13.37

11.59 - 13.36

12.12 - 13.52

11.02 - 12.49

CaO

8.57 - 15.10

7.69 - 14.2

11.07 - 12.81

12.48 - 16.42

10.81 - 14.02

9.71 - 14.17

11.19 - 14.54

MgO

4.62 - 14.80

5.67 - 9.81

5.81 - 9.21

12.90 - 19.97

10.16 - 14.20

10.10 - 18.96

5.82 - 13.19

Na₂O

2.23 - 6.05

1.42 - 4.87

3.08 - 4.41

1.80 - 3.07

1.98 - 3.93

1.19 - 3.27

1.89 - 3.16

K₂O

0.23 - 1.88

0.08 - 1.72

1.92 - 2.77

0.93 - 1.34

0.56 - 1.13

0.35 - 1.25

1.23 - 2.91

TiO₂

1.57 - 2.61

1.46 - 2.24

3.53 - 4.40

3.31 - 3.40

2.71 - 3.47

2.25 - 4.42

2.66 - 3.91

P₂O₅

0.34 - 1.34

0.28 - 0.74

0.60 - 0.91

0.48 - 1.44

0.40 - 0.79

0.30 - 0.65

0.48 - 1.20

Total

99.13 - 101.9

99.9 - 101.4

99.86 - 100.88

97.10 - 99.76

98.82 - 100.68

96.51 - 100.85

95.76 - 99.02