Samples/major

elements

Gaschiga

Sekandé

Boulgou

GA1C2

GA2C2

GA3C2

SK1C2

SK1C3

SK2C2

SK3C2

SK4C3

BO1C2

BO2C2

BO3C2

BO5C2

SiO₂

54.20

53.20

59.25

56.92

59.84

50.68

52.34

55.39

58.60

51.76

58.90

57.29

Al₂O₃

15.78

18.02

18.55

17.96

17.51

19.77

18.05

20.33

16.00

18.50

15.19

16.73

Fe₂O₃

3.46

6.02

6.10

6.92

6.27

9.16

10.07

8.10

6.13

8.54

6.83

5.66

K₂O

3.13

1.94

1.61

0.20

0.61

2.26

2.34

3.20

2.64

2.24

3.26

2.86

MgO

1.25

2.35

1.96

1.74

1.65

2.77

4.48

1.42

0.98

1.45

2.89

1.24

TiO₂

0.05

0.04

0.06

0.84

0.73

1.16

0.92

0.99

1.11

1.68

1.39

1.31

P₂O₅

0.27

0.35

0.04

0.28

0.25

0.01

0.26

0.94

0.24

0.42

0.41

0.19

CaO

0.17

0.57

1.84

1.69

1.12

1.85

0.55

0.00

2.78

3.75

1.56

2.91

Na₂O

1.85

1.40

1.74

0.97

0.82

1.14

0.56

0.99

2.27

2.57

2.59

2.18

MnO

0.26

0.41

0.06

0.05

0.05

0.07

0.07

0.78

0.08

0.09

0.13

0.08

LOI

15.87

14.99

7.53

10.27

12.00

10.86

10.09

8.48

6.97

7.44

6.42

7.94

Total

96.29

99.29

98.74

97.84

100.85

99.73

99.73

100.62

97.78

98.44

99.57

98.39

SiO₂/Al₂O₃

3.43

2.95

3.19

3.16

3.41

2.56

2.89

2.72

3.65

2.79

3.87

3.42

CIA

75.39

82.20

78.14

86.30

87.30

79.02

84.00

82.91

67.60

68.40

67.20

67.80

TiO₂ + Fe₂O₃ +

CaO + MgO +

Na₂O + K₂O

9.91

12.32

13.31

12.36

11.2

18.34

18.92

14.7

15.91

20.23

18.52

16.16