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Swiss Journal of Geosciences

Table 11 Composition of epidote/clinozoisite/allanite from three samples of TGU Grt-Ph schist

From: The Theodul Glacier Unit, a slab of pre-Alpine rocks in the Alpine meta-ophiolite of Zermatt-Saas, Western Alps

 

KB860

OK-Z131

OK-Z133

Epidote

Allanite

REE-Zoisite

Ep1

Ep2

Ep-ES1

Ep1

Ep2

Ep3

SiO2

37.05

34.42

34.30

38.51

38.81

38.88

39.39

39.55

39.13

Al2O3

30.43

27.26

26.24

28.13

28.79

30.66

32.65

32.60

32.35

Fe2O3

4.92

4.92

 

5.75

5.44

4.41

1.48

1.76

1.91

MnO

0.11

0.01

0.03

0.10

0.10

0.16

0.00

0.07

0.00

MgO

0.04

0.31

0.15

0.03

0.00

0.00

0.00

0.00

0.00

CaO

23.60

21.49

21.54

22.96

23.94

23.97

24.53

24.69

24.21

Total

96.15

88.41

82.26

95.48

97.08

98.08

98.05

98.67

97.60

Si

2.91

2.85

2.97

3.03

3.01

2.97

2.99

2.98

2.98

Al

2.82

2.66

2.68

2.61

2.63

2.76

2.92

2.90

2.91

Fe3+

0.29

0.34

 

0.38

0.35

0.28

0.09

0.11

0.12

Ca

1.99

1.91

2.00

1.93

1.99

1.96

1.99

2.00

1.98

  1. Epidote rim = Euhedral overgrowth on corroded REE-rich allanite (core). REE-zoisite = Fe-free zoisite containing about 15 wt% REE2O3 total
  2. Formulas normalized to 12.5 oxygen
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