Table 4 Mass fractions (%) of major and minor elements in the investigated soil samples.

MVENGUE

M1

49.27 ± 0.05

1.355 ± 0.001

42.75 ± 0.08

0.956 ± 0.004

0.0400 ± 0.0001

0.0465 ± 0.0003

0.4578 ± 0.0007

0.107 ± 0.001

0.007 ± 0.001

M2

49.66 ± 0.01

1.266 ± 0.001

41.31 ± 0.05

0.0011 ± 0

0.0325 ± 0.0001

0.068 ± 0.050

0.5463 ± 0.0003

0.106 ± 0.0001

ND

M3

44.32 ± 0.05

1.183 ± 0.001

46.32 ± 0.09

0.001 ± 0

0.0397 ± 0.0001

0.4349 ± 0.0006

0.7647 ± 0.0009

0.326 ± 0.003

0.064 ± 0.001

M4

53.89 ± 0.01

1.607 ± 0.001

39.79 ± 0.05

0.736 ± 0.004

0.0285 ± 0.0001

0.084 ± 0.050

0.8478 ± 0.0003

0.116 ± 0.0001

ND

M5

51.01 ± 0.05

1.452 ± 0.000

40.80 ± 0.08

0.931 ± 0.004

0.0715 ± 0.0001

0.5666 ± 0.0006

0.3586 ± 0.0006

0.305 ± 0.003

ND

M6

50.84 ± 0.05

1.478 ± 0.001

41.49 ± 0.08

0.920 ± 0.004

0.0259 ± 0.0001

0.0991 ± 0.0003

0.3690 ± 0.0006

0.129 ± 0.002

0.016 ± 0.00

AWANDA

A1

45.56 ± 0.05

1.218 ± 0.001

43.13 ± 0.09

0.0013 ± 0

0.0405 ± 0.0001

0.3917 ± 0.0006

0.5083 ± 0.0008

0.143 ± 0.002

0.019 ± 0.001

A2

49.78 ± 0.05

1.379 ± 0.001

42.78 ± 0.08

0.914 ± 0.08

0.0257 ± 0.0001

0.0478 ± 0.0002

0.2988 ± 0.0006

0.088 ± 0.001

ND

A3

51.38 ± 0.05

1.196 ± 0.001

43.37 ± 0.08

0.696 ± 0.003

0.0144 ± 0.0001

0.0207 ± 0.0002

0.4864 ± 0.0007

0.042 ± 0.001

ND

A4

52.43 ± 0.05

1.462 ± 0.001

40.06 ± 0.08

0.842 ± 0.004

0.0596 ± 0.0001

0.4465 ± 0.0006

0.6361 ± 0.0008

0.350 ± 0.003

ND

MIN

44.32

1.183

39.79

0.001

0.0144

0.02066

0.299

0.042

0.007

MAX

53.89

1.607

46.32

0.956

0.0715

0.5666

0.848

0.350

0.064

Average

49.814

1.360

42.18

0.856

0.038

0.221

0.527

0.171

0.010

Upper crust^*

66.6

0.64

15

5.04

0.10

3.59

2.8

0.15

ND