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Fig. 13.8 a Water-
undersaturated phase
relationships for a olivine
leucitite from Gaussberg. First
appearance of minerals
labeled in a and b. The four-
phase lherzolite multiple
saturation point is labeled at
2.7 GPa (after Foley 1989). L:
liquid, Ol: olivine, Opx:
orthopyroxene, Cpx:
Clinopyroxene, Phl:
phlogopite, San: Sanidine.
b Phase relation in presence
of volatile (H
2
O>>CH
4
)
(after Foley 1989a).
Abbreviations are same as
Fig.
13.8
a. c Liquidus phase
relationships for an olivine
lamproite composition from
West Kimberley under
fluid
present (H
2
O>>CH
4
)
conditions. Phase
relationships were determined
to 4.0 GPa (Foley 1989a), and
are extrapolated here to
6.0 GPa to show that they are
consistent with phlogopite-
harzburgite partial melting at
approximately 5.5 GPa (after
Foley 1990)
(a)
T
o
1000
1100
1200
1300
San
Ol
1.0
Cpx
Opx
L
Phl
2.0
Gnt
3.0
O
4.0
(b)
T
o
1000
1100
1200
1300
1400
(b)
Cpx
Ol
1.0
L
Phl
2.0
3.0
Opx
Rut
4.0
(c)
olivine
clinopyroxene
liquid only
orthopyroxene
mica
rutile
ilmenite
2.0
2.5
3.0
3.5
4.0
g
d
4.5
5.0
5.5
6.0
1000
1100
1200
1300
T
o
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