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Table 1 Fe–Ti oxide compositions calculated based on stoichiometry

From: New temperature and oxygen fugacity data of Martian nakhlite from Northwest Africa (NWA) 5790 and implications for shallow sulphur degassing

No.

Tim1

Ilm1

Tim2

Ilm2

Tim3

Ilm3

Tim4

Ilm4

Occurrence

Lamellae

Lamellae

Rim/veinlet

Rim/veinlet

SiO2

0.20

0.21

0.23

0.31

0.08

0.25

0.09

1.46

TiO2

14.09

38.82

12.86

37.80

11.22

44.17

11.49

40.99

Al2O3

2.45

0.75

2.62

1.02

2.53

0.38

2.82

0.42

Cr2O3

2.48

1.15

2.28

1.49

2.25

0.68

2.15

0.66

FeO

41.23

31.47

40.39

30.55

38.86

37.45

39.65

32.45

Fe2O3

33.35

24.26

36.15

25.79

39.15

14.79

39.09

18.44

MgO

0.29

0.65

0.26

0.58

0.20

0.70

0.20

0.83

MnO

0.44

0.73

0.40

0.81

0.47

0.92

0.29

1.58

CaO

0.06

0.03

0.01

0.03

n.d

0.02

n.d

0.02

V2O3

0.50

n.d

0.50

n.d

0.50

n.d

0.50

n.d

ZnO

n.d

0.10

n.d

0.10

n.d

0.10

n.d

0.10

Total

95.09

98.20

95.70

98.48

95.26

97.95

96.28

97.15

T (°C)

1032

1005

848

901

logfO2

− 9.05

− 9.30

− 12.39

− 11.15

ΔQFMa

+ 1.44

+ 1.60

+ 1.26

+ 1.49

  1. n.d. not detected, Tim titanomagnetite, Ilm ilmenite
  2. aThe ΔQFM values were calculated using an equation from Frost (1991)