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Progress in Earth and Planetary Science

Table 1 Composition of the starting materials used in the experiments and the natural Al-depleted and Al-undepleted komatiites (wt%)

From: Hydrogen-rich hydrothermal environments in the Hadean ocean inferred from serpentinization of komatiites at 300 °C and 500 bar

 

Starting material

Natural komatiite

 

Olivinea

Al2O3-5 % komatiiteb

Al2O3-10 % komatiiteb

ADKc

ADKd

AUKe

AUKf

SiO2

41.25

46.92

44.30

46.50

47.16

45.90

48.96

TiO2

0.01

0.30

0.29

0.30

0.38

0.41

0.47

Al2O3

0.02

4.78

10.11

4.74

4.09

7.97

9.87

FeOtotal

9.20

11.16

10.53

11.90

12.01

11.07

10.96

MnO

0.10

0.21

0.20

0.21

0.20

0.21

0.19

MgO

49.92

29.61

27.95

29.30

27.97

26.38

19.50

CaO

0.09

6.55

6.19

6.32

6.61

7.74

8.91

Na2O

0.01

0.35

0.33

0.35

0.37

0.43

1.06

K2O

0.00

0.11

0.11

0.11

0.04

0.09

0.08

  1. aDetermined by EPMA analysis
  2. bCalculated from the amounts of reagents
  3. cAn Al-depleted komatiite collected from Barbertone Greenstone Belt (South Africa) (Yoshizaki et al. 2009)
  4. dAn average composition of Al-depleted komatiites from Barbertone greenstone belt (South Africa) (Wei et al. 1990)
  5. eAn average composition of Al-undepleted komatiites from Munro/Newton Township (Canada) and Belingwe greenston belt (Zimbabwe) (Wei et al. 1990)
  6. fAn average composition of Al-undepleted komatiites from Munro Township (Canada) (Arth et al., 1977)
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