Table 1 Representative electron-microprobe analyses of peak-metamorphic and retrograde minerals

From: Eclogitic metagabbro from the Lanzada Window, eastern Central Alps: confirmation of subduction beneath the Malenco Unit

  Garnet 1
Core
Garnet 2
Intermed.
Garnet 3
Near rim
Garnet 4
Rim cont. Cpx
Omphacite 1
Core Cpx agg.
Omphacite 2
Core near Grt
Omphacite 3
Core cont. Ep
Omphacite 4
Rim cont. Grt
Epidote 1
Core dist. Cpx
Epidote 2
Rim dist. Cpx
Epidote 3
Rim cont. Grt
Phengite 1
Core
Phengite 2
Core
Titanite 1
Small cont. Cpx
Hornblende 1
Core
Hornblende 2
Rim cont. Cpx
Albite 1
Poik
Oxides
 SiO2 37.20 37.50 37.66 37.63 54.71 55.65 55.06 55.55 38.66 38.29 36.94 49.50 49.49 30.34 49.18 48.93 67.87
 TiO2 0.16 0.11 0.08 0.07 0.24 0.06 0.07 0.04 0.13 0.13 0.11 0.35 0.41 38.60 0.20 0.20 0.00
 Al2O3 21.14 21.05 21.35 21.63 6.86 10.95 10.31 10.80 29.35 27.00 22.19 29.19 28.93 1.30 7.72 8.13 20.11
 Cr2O3 0.03 0.02 0.02 0.01 0.00 0.02 0.04 0.02 0.03 0.02 0.03 0.01 0.00 0.02 0.01 0.03 0.00
 Fe2O3 2.26 3.59 4.60 4.82 5.87 8.59 15.08 0.00 0.00 4.25 4.55 0.10
 FeO 27.77 27.64 26.18 25.18 4.23 4.18 3.92 3.16 3.12 3.18 0.32 8.80 9.03
 MnO 2.01 1.89 1.06 1.51 0.25 0.31 0.32 0.25 0.05 0.20 0.37 0.05 0.02 0.07 0.45 0.46 0.00
 MgO 1.16 1.27 1.70 1.69 10.10 6.34 6.25 6.46 0.05 0.04 0.00 3.26 3.23 0.01 13.44 13.11 0.00
 CaO 10.53 10.82 12.18 12.84 17.01 11.31 11.42 10.98 23.88 23.62 23.09 0.04 0.03 28.37 9.52 9.66 0.29
 Na2O 0.00 0.00 0.00 0.00 4.61 7.83 7.74 8.08 0.00 0.00 0.00 0.51 0.57 0.01 2.96 2.79 11.46
 K2O 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.01 9.97 9.89 0.00 0.36 0.43 0.04
 Total 100.00 100.30 100.23 100.57 100.26 100.24 99.73 100.17 98.02 97.89 97.82 95.97 95.74 99.04 96.88 97.30 99.86
Formula 12(O) 12(O) 12(O) 12(O) 6(O) 6(O) 6(O) 6(O) 12.5(O) 12.5(O) 12.5(O) 11(O) 11(O) 5(O) 23(O) 23(O) 8(O)
 Si 2.976 2.988 2.982 2.966 1.978 1.991 1.987 1.986 2.987 2.996 2.971 3.289 3.297 0.999 7.151 7.100 2.969
 Ti 0.009 0.006 0.005 0.004 0.006 0.002 0.002 0.001 0.008 0.008 0.007 0.017 0.020 0.956 0.022 0.022 0.000
 Al 1.994 1.977 1.992 2.009 0.292 0.462 0.439 0.455 2.673 2.490 2.104 2.286 2.271 0.050 1.323 1.391 1.037
 Cr 0.002 0.001 0.001 0.001 0.000 0.001 0.001 0.001 0.002 0.001 0.002 0.001 0.000 0.000 0.001 0.003 0.000
 Fe3+ 0.061 0.097 0.125 0.130 0.341 0.506 0.913 0.000 0.000 - 0.465 0.497 0.003
 Fe2+ 1.858 1.842 1.733 1.660 0.128 0.125 0.118 0.095 - - - 0.173 0.177 0.009 1.070 1.096 -
 Mn 0.136 0.128 0.071 0.101 0.008 0.009 0.010 0.008 0.003 0.013 0.025 0.003 0.001 0.002 0.055 0.056 0.000
 Mg 0.139 0.151 0.201 0.199 0.544 0.338 0.336 0.344 0.006 0.005 0.000 0.322 0.321 0.000 2.913 2.835 0.000
 Ca 0.902 0.924 1.033 1.084 0.659 0.433 0.441 0.421 1.977 1.980 1.990 0.003 0.002 1.001 1.482 1.501 0.014
 Na 0.00 0.00 0.00 0.00 0.323 0.543 0.541 0.560 0.000 0.000 0.000 0.065 0.073 0.001 0.833 0.784 0.972
 K 0.00 0.00 0.00 0.00 0.000 0.000 0.000 0.000 0.000 0.000 0.001 0.845 0.841 0.000 0.067 0.080 0.002
 Total 8.017 8.017 8.017 8.025 4.000 4.000 4.000 4.000 7.997 7.999 8.013 7.005 7.004 3.019 15.382 15.365 4.998
 Mg/(Mg+Fe2+) 0.069 0.076 0.104 0.107 0.810 0.730 0.740 0.784 0.650 0.644 0.731 0.721
  1. Garnet analyses 1, 2 and 4 are from the same porphyroblast; epidote analyses 1 and 2 are from the same crystal; all other analyses are from different crystals
  2. cont contacting, dist distant from, Cpx agg in interior of Cpx aggregate, poik poikiloblast