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7
50 55 60 65 70 75 80
CKD
VF
RA
SR
0
1
2
3
4
5
6
7
50 55 60 65 70 75 80
Tephra
Welded tuffs
(d)(c)
(a)
SiO2
SiO2
(b)
K2O
0
1
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3
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5
6
7
50 55 60 65 70 75 80
Complex volcanoes
Calderas
Monogenetic volcanoes
SiO2
K2O
K2O
0
1
2
3
4
5
6
7
50 55 60 65 70 75 80
SiO2
K2O
BBA
A
DR
LK
MK
HK
Holocene
Late Pleistocene
Middle Pleistocene
Early Pleistocene–Pliocene