Tsarasaotra

Monzonitic

Granitic dyke

TS-6

TS-1

TS-6

TS-1

TS-2

TS-2

TS-3

TS-3

MT-1

ILM-2

MT-2

ILM-3

MT-1

ILM-1

MT-3

MT-2

Data with recalculated ferrous and ferric components after Carmichael (1966) .

SiO₂

0.04

0.01

0.04

0.03

0.05

0.03

0.05

0.04

TiO₂

0.02

46.0

0.02

46.5

0.01

47.4

0.04

46.0

Al₂O₃

0.08

0.02

0.08

0.01

0.07

0.02

0.10

0.01

Fe₂O₃

69.6

14.4

69.6

12.3

69.2

9.8

68.1

11.0

FeO

31.4

38.6

31.4

38.9

31.3

40.5

30.8

33.2

MnO

0.09

2.30

0.09

2.38

0.02

1.86

0.08

7.78

MgO

0.01

0.26

0.01

0.31

0.00

0.16

0.00

0.22

CaO

0.01

0.01

0.01

0.01

0.00

0.00

0.00

0.01

Total

101

102

101

100

101

100

99.2

98.3

XUsp/XIlm

0.00

0.86

0.00

0.88

0.00

0.90

0.00

0.88

Fe-Ti geothermometer and oxygen fugacity after Spencer & Lindsley (1981) .

T (˚C)

482

474

437

504

log₁₀ f_O2

−17.5

−18.2

−19.9

−17.7

T (˚C) Average

478

471