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Table 3 Representative analysis of epidote and allanite from the Miagliano Pluton

From: Dating emplacement and evolution of the orogenic magmatism in the internal Western Alps: 1. The Miagliano Pluton

Mineral

Epa

Epa

Epa

Alnb

Alnb

Alnb

Alnb

Oxide (wt%)

 SiO2

37.07

36.72

37.16

33.19

33.94

34.73

34.63

 TiO2

0.70

0.15

0.14

0.52

0.39

0.25

0.21

 ThO2

   

1.36

0.87

0.09

0.09

 Al2O3

22.76

23.95

23.53

17.46

18.45

21.06

21.08

 Fe2O3

8.91

8.24

7.75

2.69

3.20

5.16

4.90

 La2O3

   

6.20

5.48

3.36

3.51

 Ce2O3

   

8.35

8.67

6.30

6.20

 Pr2O3

   

0.69

0.76

0.66

0.70

 Nd2O3

   

1.93

2.25

2.07

2.09

 Sm2O3

   

0.08

0.19

0.33

0.23

 Gd2O3

   

0.08

0.20

0.11

0.10

 FeO

   

10.07

9.43

6.86

7.01

 CaO

23.54

22.15

24.38

12.21

12.77

15.64

15.56

 MgO

2.24

3.55

2.41

1.38

1.20

0.56

0.57

 Sum

95.22

94.75

95.36

96.20

97.79

97.19

96.88

Cation (apfu)

 Si

2.975

2.929

2.957

3.066

3.067

3.022

3.022

 Al

0.025

0.071

0.043

    

 ∑T-site

3.000

3.000

3.000

3.066

3.067

3.022

3.022

 Al

2.128

2.181

2.164

1.901

1.965

2.160

2.168

 Mg

0.268

0.422

0.286

0.190

0.161

0.073

0.074

 Ti

0.042

0.009

0.008

0.036

0.027

0.016

0.014

 Fe3+

0.538

0.494

0.464

0.187

0.217

0.338

0.322

 Fe2+

   

0.778

0.713

0.499

0.511

 ∑M1–3-site

2.976

3.107

2.921

3.091

3.083

3.086

3.089

 Ca

2.024

1.893

2.079

1.208

1.236

1.458

1.455

 Mn2+

   

0.012

0.011

0.014

0.015

 La

   

0.211

0.183

0.108

0.113

 Ce

   

0.282

0.287

0.201

0.198

 Pr

   

0.023

0.025

0.021

0.022

 Nd

   

0.064

0.073

0.064

0.065

 Sm

   

0.003

0.006

0.010

0.007

 Gd

   

0.002

0.006

0.003

0.003

 Th

   

0.029

0.018

0.002

0.002

 U4+

   

0.003

0.002

0.002

0.002

 ∑A1–2-site

2.024

1.933

2.087

1.897

1.858

1.894

1.905

  1. aEpidote norm based on 13 oxygens, 1 (OH, F, Cl) and Fe3+/Fetot = 1
  2. bAllanite norm based on 8 cations and 25 charges