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Table 4 Summary of the difference in the element concentrations in the surface varnish with increasing artificial weathering time

From: Artificial weathering of rock types bearing petroglyphs from Murujuga, Western Australia

Sample

Time [months]

Δ [wt.%]

SiO2

Al2O3

Fe2O3

K2O

CaO

TiO2

MnO

Gabbro

1

4.2 ± 2.1

6.8 ± 2.1

− 6.8 ± 1.3

− 3.4 ± 1.5

− 14.9 ± 3.8

− 7.5 ± 1.9

− 2.3 ± 1.9

3

5.7 ± 1.6

11.8 ± 3.8

− 8.77 ± 1.6

− 6.2 ± 1.6

− 8.70 ± 5.4

− 3.0 ± 4.0

− 10.39 ± 2.5

4

8.0 ± 3.0

16.2 ± 7.2

− 3.9 ± 1.1

− 10.9 ± 1.2

− 22.4 ± 1.8

− 11.5 ± 3.8

− 7.1 ± 1.9

Granophyre

1

12.8 ± 5.4

16.9 ± 11.8

10.7 ± 4.0

17.4 ± 5.2

27.6 ± 2.1

9.1 ± 4.1

21.6 ± 16.5

3

17.7 ± 6.0

48.4 ± 17.0

− 5.1 ± 4.1

− 7.0 ± 3.5

− 32.4 ± 1.6

− 13.9 ± 4.8

4.9 ± 5.1

4

27.6 ± 10.4

71.4 ± 26.4

− 5.1 ± 4.9

− 9.6 ± 6.1

− 19.7 ± 3.2

− 7.5 ± 7.0

− 14.7 ± 9.5