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Fig. 1.2 a The K
2
O/Na
2
O
ratio versus SiO
2
content of
K-rich volcanic rocks of
different localities. WK West
Kimberley (Australia), GB
Gaussberg (Antarctica), AB
Alkali Basalt. b The K
2
O/
Na
2
O ratio versus SiO
2
content of potassium-rich
volcanic rocks from different
localities. LH Lucite Hills (U.
S.A.), SP Spain, EqAf:
Equatorial Africa, Inds
Indonesia, AB Alkali Basalt.
c The K
2
O/Na
2
O ratio versus
SiO
2
content of potassium-
rich volcanic rocks from
different localities. Vc Vico,
Rc Roccamon
na (both from
Italy), NSW New South Wales
(Australia), HWM Highwood
Mountains, G Gaussberg
(Antarctica), Mc Murcia
(Spain), Tc Tuscany, AB
Alkali Basalt
(a)
16
14
WK, GBg
12
10
WK
GB
RG
AB
8
6
4
2
30
40
50
60
70
SiO (wt%.)
2
(b)
10
9
8
7
LH
6
5
4
AB
Sp
Inds
EqAf
LH
Inds
3
Sp
2
EqAf
1
AB
30
40
50
60
70
80
SiO (wt%.)
2
(c)
8
7
.
X
Vc + Rc
6
.
.
Vc
Rc
NSW
HWM
Mc
Tc
G
AB
X
X
5
NSW
.
X
4
X
.
.
3
.
X
X
HWM
2
.
.
Mc + Tc
G
.
.
. .
.
.
1
.
AB
10
20
30
40
50
60
70
80
SiO (wt%.)
2
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