European Geosciences Union General Assembly 2015 - Garnet Classification
5 peridotite groups - Groups IV-V
Groups IV-V contain:
ā Garnets with low concentration of TiO, and
mildly (Group IV) to humped (Group V)
"sinusoidal" Cl-normalized REE patterns with
a maximum at Nd-Sm and a minimum at
Dy-Ho; these garnets are comparable with
G9 and G10 garnets accordingly and have
depleted peridotite origin by [Griffin et al.,
1999];
ā Clinopyroxenes (Group IV) have the highest
degrees of REE profiles with flat pattern for
LREE and depleted in Ti.
100
Gar / C1 (Sun & McDonough, 1989)
10
10
1
0.1
0.01
IV
Megacrysts
TiO2 < 0.2 wt.%
Group IV garnet
La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
100
10
V
Gar / C1 (Sun & McDonough, 1989)
T
EUROPEAN
GEOSCIENCES UN
Assembly
General!
2015
0.01
Megacrysts
TiO2 <0.2 wt.%
Group V garnet
La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
100
Cpx / C1 (Sun & McDonough, 1989)
10
=
10
La/Ybn - 32-176
IV
0,1
0,01
TiO, < 0.25 wt.%
Group IV clinopyroxene
La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
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