Table 1. Representative microprobe analyses and calculated formula of garnet (single spots).
Rock type:
Staurolite-bearing high-grade schist
Corundum-bearing schist
Biotite-rich schist
Gneiss
Sample:
161-976B-76R-1, 3-7 cm
976B-76R-1,
3-7 cm
976B-76R-1,
45-49 cm
976B-77R-2,
40-42 cm
976B-77R-2,
40-42 cm
976E-14R-1,
98-102 cm
976B-98R-1,
96-101 cm
Textural position:
Garnet I core
Garnet I rim
Garnet II
Core
Rim
Garnet II rim
Garnet II core
Analytic point:
E-17
E-3
B-104
F-58
F-72
A-54
104-4
SiO2 37.17 36.95 37.70 36.91 37.01 36.81 36.00
Al2O3 20.98 20.80 21.23 20.78 21.04 20.96 20.54
TiO2 0.22 0.10 0.07 0.28 0.05 0.06 0.10
MgO 0.28 0.92 1.59 1.24 2.07 1.59 1.12
FeO 28.32 35.52 34.46 25.04 28.16 35.70 36.58
MnO 5.50 2.15 3.03 5.74 5.00 1.98 4.60
CaO 8.26 4.05 3.73 10.72 6.53 3.05 1.20
Total 100.73 100.49 101.81 100.71 99.86 100.15 100.14
Cations normalized to 12 oxygens (all Fe as Fe2+)
Si 2.983 2.992 2.998 2.955 2.967 2.983 2.946
Aliv 0.017 0.008 0.002 0.045 0.033 0.017 0.054
Alvi 1.969 1.978 1.989 1.916 1.956 1.985 1.927
Ti 0.013 0.006 0.004 0.017 0.003 0.003 0.006
Y 1.982 1.984 1.993 1.933 1.959 1.988 1.933
Fe2+ 1.903 2.408 2.292 1.616 1.894 2.422 2.516
Mg 0.034 0.111 0.189 0.148 0.247 0.191 0.136
Mn 0.374 0.147 0.204 0.389 0.340 0.136 0.319
Ca 0.710 0.351 0.317 0.920 0.561 0.265 0.105
X 3.021 3.017 3.002 3.073 3.042 3.014 3.076
Alm 0.630 0.798 0.763 0.526 0.623 0.804 0.818
Grs 0.235 0.116 0.106 0.299 0.184 0.088 0.034
Pyr 0.011 0.037 0.063 0.048 0.081 0.064 0.044
Sps 0.124 0.049 0.068 0.127 0.112 0.045 0.104
Fe/(Mg + Fe) 0.983 0.956 0.924 0.916 0.885 0.927 0.949

Notes: End-member mole fractions are calculated as [Fe2+/ X] = Alm; [Ca/ X] = Grs; [Mg/ X] = Pyr; and [Mn/ X] = Sps; mineral abbreviations from Kretz (1983).