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Table 4 Electron probe microanalyses of white micas (cation numbers normalized to O10(OH)2)

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

Sample

Mineral

n

 

Si

AlIV

AlVI

Ti

Fe2+

Mn

Mg

Ca

K

Na

Total

∑ oct.

∑ inter.

t.i.c.

Alt

#Mg

75.0 m

Ms

13

Mean

3.11

0.90

1.86

0.02

0.08

0.00

0.07

0.00

0.79

0.15

6.97

2.03

0.94

0.94

2.76

48.79

SD

0.04

0.04

0.03

0.01

0.04

0.01

0.03

0.00

0.05

0.05

0.04

0.03

0.06

0.06

0.07

13.22

38.3 m

Ms

3

Mean

3.10

0.90

1.92

0.00

0.05

0.00

0.04

0.00

0.77

0.20

6.98

2.01

0.97

0.97

2.81

46.17

SD

0.00

0.00

0.02

0.00

0.01

0.00

0.01

0.00

0.02

0.03

0.03

0.01

0.04

0.04

0.02

11.76

Pg

3

Mean

2.99

1.01

2.01

0.00

0.00

0.00

0.00

0.02

0.08

0.85

6.96

2.01

0.95

0.97

3.02

SD

0.04

0.04

0.03

0.00

0.00

0.00

0.00

0.02

0.01

0.10

0.09

0.03

0.11

0.12

0.02

13.0 m

Msb

1

repr. anal.

3.15

0.85

2.13

0.00

0.05

0.00

0.00

0.00

0.32

0.05

6.55

2.18

0.37

0.37

2.98

0.00

7.6 m

Ms

1

repr. anal.

3.17

0.83

1.90

0.00

0.07

0.00

0.08

0.00

0.66

0.17

6.88

2.05

0.83

0.83

2.72

54.57

Ms-Pga

1

repr. anal.

3.08

0.92

1.98

0.00

0.05

0.00

0.02

0.04

0.23

0.54

6.85

2.05

0.80

0.84

2.90

24.44

  1. n number of the measured grains, repr. anal. representative analysis, SD standard deviation (with italic), ∑ oct. sum of octahedral cations, ∑ inter. sum of the interlayer cations, t.i.c. total interlayer charge = 2 × Ca + K + Na, Al t sum of AlIV and AlVI, #Mg Mg/(Mg + Fe2+) × 100
  2. aFinely intergrown Ms and Pg phases
  3. bStrongly degraded Ms