European Geosciences Union General Assembly 2015 - Garnet Classification
EUROPEAN
GEOSCIENCES UN
Clinopyroxene composition
General
Assembly
Cpx has a wide range of Cr2O3 (0.69-3.93 wt.%), TiO2 (up to 0.84 wt.%), Al2O3 (0.47-5.61 wt.%)
contents with Mg# = 0.89-0.95;
By Cr2O3 content and Mg# values:
1. The most part of clinopyroxenes
are comparable with the coarse
mantle peridotite clinopyroxenes;
2. The less part of clinopyroxenes are comparable
with the high-Cr megacryst clinopyroxenes
[Kopylova et al., 2009] and form one paragenesis
with the high-T "melt" metasomatic garnets.
CC
Ο
BY
Phi
Cpx2
3
TiO, 0.25-0.40 wt.%
ΟΙ
M
pyroxenites
High-Cr
megacrysts
Opx
0.88
0.90
Cpx
sheared
peridotites
Cpx
이
500μm 0009 3
coarse
peridotites
Usually
TiO2 < 0.25 wt.%
low-Cr megacrysts
Mg#
[email protected]
0.92
0.94
0.96
Fields after Kopylova et al., 2009
10
2015View entire presentation