European Geosciences Union General Assembly 2015 - Garnet Classification
Gar / C1 (Sun & McDonough, 1989)
Evolution of metasomatic agent for Group III-V
EUROPEAN
GEOSCIENCES UN
The calculated AFC-model with very intensive assimilation of depleted mantle material
(orthopyroxene) and fraction crystallization (clinopyroxene and garnet) suggests the
possible for this evolution of kimberlite melts composition:
kimberlite melts
in equlibrium with
megacrysts
M
melts in equlibrium
with Group IV
ganets
IV
assimilation of Opx
fraction crystallization
of Cpx and Gar
General Assembly 2015
100
10
IV
1
0.1
0.01
Megacrysts
AFC garnet comp.
Gruop IV garnet
(508-4)
source: megacryst-like melts
r - 0.95
F 0.55 (cpx 88%, gar - 12%)
La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Gar / C1 (Sun & McDonough, 1989)
100
10
IV
1
0.1
Megacrysts
Gruop IV garnet
(508-4)
AFC garnet comp.
source: megacryst-like melts
r - 0.95
F 0.60 (cpx 88%, gar - 12%)
0.01
La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
The calculating was performed using partition coefficient for deep lithospheric mantle situations [Burgess and Harte, 2004;
Johnson et al., 1998]. The composition of orthopyroxene was performed using composition of DM by [Salters et al., 2004].
8
CC
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