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Swiss Journal of Geosciences

Table 1 Representative mineral compositions of amphiboles in metabasites in far-eastern Nepal

From: P–T conditions of metabasites within regional metapelites in far-eastern Nepal Himalaya and its tectonic meaning

Sample

H2608

H1905

M3103

 

Matrix

Matrix

Inclusion in Grt

Matrix

Matrix

Matrix

Matrix

Core

Rim

Core

Rim

Core

Rim

Core

Rim

Core

Rim

Core

Rim

Spot no.

64

65

66

67

41

32

73

74

87

88

105

106

126

127

SiO2

43.80

46.09

42.39

45.05

44.15

43.38

44.13

44.14

44.86

43.63

41.24

41.36

41.61

41.69

TiO2

2.23

1.74

2.40

1.90

1.42

1.42

0.53

0.59

0.49

0.57

0.55

0.52

0.61

0.48

Al2O3

11.36

9.89

12.36

10.69

11.59

12.35

12.98

14.32

12.39

13.28

16.14

16.64

15.73

16.58

FeOa

15.41

14.55

15.10

14.28

16.59

16.51

16.05

15.88

15.95

16.08

17.43

17.08

17.11

17.01

MnO

0.17

0.17

0.21

0.20

0.25

0.21

0.32

0.28

0.36

0.34

0.27

0.25

0.27

0.29

MgO

10.28

11.21

10.05

11.07

9.72

9.28

9.65

8.76

9.78

9.45

8.28

7.92

8.39

8.02

CaO

11.61

11.88

11.26

11.91

11.38

11.68

11.87

11.33

11.85

11.79

11.22

11.14

11.10

11.46

Na2O

1.27

1.03

1.49

0.97

1.34

1.13

1.31

1.17

1.42

1.21

1.37

1.41

1.35

1.39

K2O

0.81

0.40

1.13

0.47

0.69

0.55

0.33

0.75

0.07

0.68

0.30

0.08

0.38

0.05

Total

96.95

96.96

96.38

96.54

97.13

96.50

97.16

97.23

97.15

97.02

96.80

96.39

96.54

96.96

O basis = 46

 Si

6.53

6.80

6.37

6.68

6.56

6.50

6.52

6.52

6.62

6.48

6.10

6.13

6.17

6.16

 AlIV

1.47

1.20

1.63

1.32

1.44

1.50

1.48

1.48

1.38

1.52

1.90

1.87

1.83

1.84

 AlVl

0.52

0.52

0.55

0.54

0.59

0.67

0.79

1.01

0.78

0.80

0.92

1.04

0.92

1.04

 Mg

2.28

2.47

2.25

2.45

2.15

2.07

2.13

1.93

2.15

2.09

1.83

1.75

1.85

1.77

 Ti

0.25

0.19

0.27

0.21

0.16

0.16

0.06

0.07

0.05

0.06

0.06

0.06

0.07

0.05

 Mn

0.02

0.02

0.03

0.02

0.03

0.03

0.04

0.03

0.04

0.04

0.03

0.03

0.03

0.04

 Fe3+

0.22

0.16

0.26

0.20

0.39

0.33

0.37

0.28

0.32

0.36

0.85

0.75

0.78

0.66

 Fe2+

1.70

1.63

1.63

1.57

1.68

1.74

1.62

1.68

1.65

1.64

1.31

1.37

1.34

1.44

 Ca

1.85

1.88

1.81

1.89

1.81

1.87

1.88

1.79

1.87

1.88

1.78

1.77

1.76

1.81

 Na (M4)

0.15

0.12

0.19

0.11

0.19

0.13

0.12

0.21

0.13

0.12

0.22

0.23

0.24

0.19

 K

0.15

0.08

0.22

0.09

0.13

0.11

0.06

0.14

0.01

0.13

0.06

0.02

0.07

0.01

 Na (A)

0.22

0.17

0.25

0.17

0.20

0.20

0.26

0.13

0.28

0.22

0.17

0.18

0.15

0.21

 Sum cations

15.38

15.25

15.46

15.26

15.33

15.31

15.32

15.27

15.30

15.34

15.23

15.19

15.23

15.22

 Mg/Mg + Fe

0.57

0.60

0.58

0.61

0.56

0.54

0.57

0.53

0.57

0.56

0.58

0.56

0.58

0.55

  1. aTotal Fe as FeO
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