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Table 7 Representative chemical compositions for muscovite-chlorite mixed-layers normalized to O20(OH)10 (AEM data)

From: Retrograde alterations of phyllosilicates in low-grade metapelite: a case study from the Szendrő Paleozoic, NE-Hungary

Sample

Point

 

Si

AlIV

AlVI

Ti

Fe2+

Mn

Mg

Ca

K

Na

∑ oct.

∑ inter.

Alt

#Mg

7.6 m

r7

 

6.56

1.44

2.52

0.00

2.63

0.00

2.67

0.08

0.61

0.57

7.83

1.26

3.97

50.39

 

r8

 

6.36

1.64

2.55

0.00

2.60

0.00

2.68

0.08

0.66

0.70

7.82

1.44

4.19

50.79

 

r12

 

6.67

1.33

2.85

0.00

2.86

0.00

2.19

0.17

0.17

0.34

7.90

0.68

4.18

43.44

 

g11

 

6.19

1.81

2.34

0.00

3.98

0.04

2.01

0.00

0.75

0.00

8.36

0.75

4.14

33.57

 

g18

 

6.46

1.54

3.13

0.00

3.56

0.04

1.28

0.12

0.25

0.00

8.02

0.37

4.68

26.50

 

g19

 

6.66

1.34

2.76

0.00

3.06

0.04

2.28

0.04

0.26

0.00

8.14

0.30

4.10

42.64

 

r4

 

6.76

1.24

2.72

0.00

2.79

0.00

2.34

0.00

0.58

0.25

7.85

0.83

3.96

45.53

 

r5

 

6.16

1.84

2.38

0.00

2.87

0.00

2.91

0.00

0.76

0.38

8.16

1.14

4.22

50.36

 

r6

 

6.47

1.53

2.52

0.00

2.80

0.00

2.75

0.08

0.44

0.35

8.07

0.87

4.05

49.62

 

r7

 

6.71

1.29

2.58

0.00

2.83

0.00

2.54

0.04

0.55

0.21

7.96

0.80

3.87

47.29

  

Mean

6.50

1.50

2.64

0.00

3.00

0.01

2.37

0.06

0.50

0.28

8.01

0.84

4.14

44.01

  

SD

0.21

0.21

0.24

0.00

0.44

0.02

0.47

0.06

0.21

0.24

0.17

0.36

0.22

8.09

  1. n number of the measured grains, SD standard deviation (with italic), Mean (with bold), ∑ oct. sum of octahedral cations; ∑ inter. sum of the interlayer cations, Al t sum of AlIV and AlVI, #Mg Mg/(Mg + Fe2+) × 100