European Geosciences Union General Assembly 2015 - Garnet Classification
Garnet-clinopyroxene equilibrium
EUROPEAN
GEOSCIENCES UN
General
Assembly
Calculating a garnet-clinopyroxene equilibrium coefficients (Gar/CpxD = X, Gar/X,Cpx, where Xi
concentration of element i) for I, III and IV peridotite groups suggests that:
1. Group I peridotites have the Gar/CpxD
values, which are consistent with
experimental dataset for near-solidus
carbonatitic liquid at pressures of 6.6 and
8.6 GPa and temperatures 1265 °C (base
of lithospheric mantle condition)
[Dasgupta et al., 2009];
1000
100
0
1000
100
10
10
Groups III-IV peridotites have the Gar/CpxD
values, which are consistent with dataset
for deep lithospheric mantle situations
[Burgess and Harte, 2004] at low-
temperature 900°C and nature garnet
peridotites [lonov et al., 2004].
www
IID IV
Dasgupta et al., 2009
2015
DGar/Cpx
0.1
0.01
0.001
0.0001
CC
Ο
BY
10
Dasgupta et al., 2009
1
T
900°C (Burgess, Harte, 2004)
Jonhson, 1998
D
Gar/Cpx
0.1
0.01
0.001
Group |
0.0001
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
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1
900°C (Burgess, Harte, 2004)
1300°C (Burgess, Harte, 2004)
Group III and IV
La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
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