Table 2 Elemental composition (%) of the quartz, Na-feldspar, K-feldspar, Ca-feldspar, hornblende, actinolite, augite, orthopyroxene, biotite and epidote samples

SiO₂

98.6

66.5

65.2

48.5

45.0

55.8

56.7

49.1

34.2

37.5

Al₂O₃

0.025

19.5

18.7

32.2

9.1

0.557

0.935

8.05

19.1

22.6

Fe₂O₃

0.019

0.176

0.121

0.259

14.5

8.23

6.96

17.1

25.2

13.8

TiO₂

–

0.011

0.012

0.026

0.099

0.031

0.232

0.731

2.53

0.092

MgO

0.11

–

–

0.067

12.2

20.0

13.6

20.4

4.54

0.092

CaO

–

1.69

0.358

14.5

10.8

12.6

18.2

3.02

0.671

22.6

Na₂O

–

7.04

2.57

2.51

1.75

0.15

0.94

0.34

0.3

–

K₂O

0.013

3.96

12.3

0.258

1.34

0.039

0.072

0.126

8.24

0.025

MnO

–

–

–

–

0.071

0.108

0.067

0.235

0.348

0.195

P₂O₅

–

0.017

0.023

0.013

0.014

0.017

0.012

0.016

0.603

0.011

BaO

–

–

0.026

0.012

–

–

–

–

–

–

Co₂O₃

–

–

–

–

–

–

–

0.012

–

–

Cr₂O₃

–

–

–

0.062

0.012

0.019

CuO

–

–

–

–

–

–

–

–

–

–

NiO

–

–

–

–

–

–

–

0.024

–

–

PbO

–

–

0.009

–

–

–

–

–

–

–

SrO

–

0.007

0.007

0.025

0.006

–

–

0.007

0.086

V₂O₃

–

–

–

–

–

0.026

0.035

0.017

0.077

ZnO

–

–

–

–

–

–

–

0.017

0.161

–

ZrO₂

–

–

–

–

0.013

–

0.015

–

0.128

–