HK10

D2

HK17

HK13A

C5

D60P18

Quartzite sandstone

Feldspathic sandstone

Sandstone

Bonfesso

Intiédougou

Djarkadougou

SiO₂

86.76

88.09

80.75

85.90

83.53

80.47

Al₂O₃

5.31

5.03

10.22

7.66

8.64

9.18

Fe₂O₃

4.29

3.98

3.45

2.29

2.74

2.92

TiO₂

0.40

0.40

0.30

0.22

0.19

0.25

MgO

0.08

0.08

0.15

0.10

0.16

0.46

K₂O

1.07

1.13

3.09

1.95

2.83

1.91

CaO

0.02

0.03

0.02

0.02

0.06

0.92

Na₂O

0.17

0.25

0.07

0.15

0.04

1.81

P₂O₅

0.05

0.03

0.04

0.06

0.03

0.06

MnO

0.01

0.01

<0.01

<0.01

0.01

0.04

Cr₂O₃

0.018

0.007

0.011

0.006

0.004

0.004

LOI

1.7

0.9

1.8

1.5

1.7

1.9

Sum

99.878

99.937

99.86

99.87

99.934

99.924

Trace elements

Ni

38

<20

<20

<20

<20

<20

Sc

7

5

6

5

4

5

Ba

381

385

544

583

509

380

Be

<1

<1

<1

2

2

<1

Co

58.7

4.8

47.2

48.8

4.6

5.8

Cs

1.2

0.9

8.9

1.6

6.6

2.2

Ga

6.3

7.9

9.9

8.0

9.7

8.4

Hf

2.7

2.1

1.9

1.7

1.7

1.9

Nb

3.2

3.6

3.2

2.5

3.3

2.7

Rb

33.8

32.9

80.2

56.5

71.5

48.0

Sn

1

<1

<1

<1

1

<1

Sr

52.2

50.6

52.9

120.1

33.9

109.0

Ta

0.6

0.2

0.6

0.6

0.3

0.3

Th

2.3

2.1

3.5

2.1

2.5

2.6

U

0.8

0.5

0.6

0.4

0.1

0.5

V

80

75

41

44

29

39

W

388.7

1.0

345.5

367.6

24.5

1.2

Zr

100.5

82.5

66.7

51.9

58.4

70.7