% oxide

PM

5 Jun

635 km

B

4 Jun.

75 km

LA

5 Jun

40 km

LA

Nov.

40 km

SiO₂

70.08

64.38

62.10

67.99

Al₂O₃

13.91

14.55

14.81

16.32

Na₂O

2.52

5.79

5.77

5.07

K₂O

2.19

2.47

2.31

1.61

CaO

1.88

2.90

2.78

2.30

MgO

1.04

1.30

2.37

2.27

FeO

4.00

7.82

8.51

4.74

TiO₂

0.56

0.65

0.70

0.70

SO₃

nd

0.03

0.23

nd

Cl₂O

nd

0.11

0.42

nd

Ratio

SiO₂/Al₂O₃

5.03

4.42

4.19

4.17

SiO₂/FeO

17.52

8.23

7.29

14.34

SiO₂/CaO

37.27

22.20

22.42

29.56