Table 1 Major elemental compositions of the deeply weathered rocks transitioning into the red soil and their host rocks.

From: Kibi Plateau: A stable-coherent tectonic unit in the active Japanese Islands

Site

RS1

RS2

RS3

RS4

RS5

(wt%)

Red soil

Red soil

Host rock

Red soil

Host rock

Red soil

Red soil

Host rock

SiO2

54.20

65.95

75.02

66.92

71.27

79.22

61.08

71.78

TiO2

1.51

0.70

0.10

0.44

0.27

0.50

0.91

0.24

Al2O3

29.03

25.16

13.19

23.09

14.44

14.56

25.40

13.58

ΣFe2O3

12.41

6.57

2.05

5.13

3.40

3.59

8.67

4.17

MnO

0.04

0.01

0.05

0.02

0.06

0.02

0.16

0.09

MgO

0.76

0.30

0.20

0.38

0.49

0.28

0.72

0.42

CaO

0.00

0.00

1.10

0.00

2.27

0.00

0.00

1.89

Na2O

0.19

0.20

3.55

0.32

3.96

0.19

0.21

3.84

K2O

1.07

0.48

4.26

3.26

3.63

0.61

2.18

3.55

P2O5

0.09

0.01

0.01

0.02

0.07

0.01

0.04

0.07

Total

99.30

99.38

99.53

99.58

99.86

98.98

99.37

99.63

LOI

14.85

12.49

0.63

8.26

0.24

6.30

13.02

0.66

Host rock type

Schistose rock

Rhyolite

Granite

Pelite

Granite

Age

Permian

Cretaceous

Cretaceous

Permian

Cretaceous

Latitude

N34°53'38.7"

N34°55'54.6"

N34°52'15.2"

N34°52'19.1"

N34°52'48.1"

N34°47'24.3"

Longitude

E134°02'34.8"

E134°00'47.6"

E134°01'26.6"

E134°01'26.0"

E133°56'44.0"

E133°51'54.6"

Elevation

360 m

422 m

250 m

240 m

288 m

308 m

  1. The sampling sites of RS1 to RS4 are shown in Fig. 3a and the site (Fig. 2a) of RS5 is shown in Fig. 1a. This table also shows the host rock types and their ages, and the latitude, longitude and elevation of the sampling sites.
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