Geology Reference
In-Depth Information
Table 9.1 Temperatures of various piercing points within the system diopside
-
leucite
-
anorthite
-
SIO
2
Piercing point
Temp (
o
C)
System
Reference
1
1,249
Diopside
-
leucite
-
anorthite
Gupta and Yagi (1980)
2
<1,200
Diopside
leucite
sanidine.
Schairer and Bowen (1938)
-
-
3
?
Diopside
sanidine
anorthite
Not determined
-
-
4
<1,100
Diopside
-
sanidine
-
anorthite
Schairer and Bowen (1947)
5
<1,200
Diopside
leucite
SiO
2
Schairer and Bowen (1938)
-
-
6
<900
Anorthite
leucite
SiO
2
Schairer and Bowen (1947)
-
-
7
1,200
Diopside
-
anorthite
-
SiO
2
Hytonen and Schairer (1961)
orthoclase (sanidine) divides the system into a sil-
ica-saturated and a silica-undersaturated portion. On the basis of the results of these
ternary joins, the various phase volumes and the courses of crystallization of melts
within the system can be constructed as shown in Fig.
9.12
. The system has two
invariant points: E
1
(silica-undersaturated) and E
2
(silica-saturated). If the initial
composition of the liquid lies in the silica-de
The join diopside
anorthite
-
-
cient portion of the system, the
D
E
Lc
ss
Di
ss
San
ss
An
ss
San
ss
Tridy
L
L
Di
ss
Di
ss
Di
ss
E
2
E
1
Di
ss
A
C
San
ss
An
ss
Lc
ss
San
ss
An
ss
An
ss
Tridy
1249
An
ss
L
L
L
L
An
ss
San
ss
Tridy
Di
ss
San
ss
Lc
ss
(Di +Lc +An +San +L)
ss
L
(Di
ss
ss
ss
ss
L
B
G
Fig. 9.12 Flow sheet diagram related to the system diopside
-
leucite
-
anorthite
-
SiO
2
(after Gupta
and Yagi 1980)
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