The Mavuradonha Layered Complex: Neoproterozoic ... - ArchiMeD

Appendix A-III. Petrography and metamorphic evolution xxx
Table III-6. Representative microprobe analyses of plagioclases from samples from the Mavuradonha Layered Complex
sample Mav1 Mav1 Mav1 Mav1 Mav1 Mav1 sample ZZB 4 ZZB 4 ZZB 4 ZZB 4 ZZB 4 ZZB 4 sample ZZB 5 ZZB 5 ZZB 5 ZZB 5 ZZB 5 ZZB 5
analysisno.
SiO2
Na2O
K2O
TiO2
FeO
Al2O3
MgO
CaO
MnO
Total
Si
Ti
12 1 8
6 15 19 analysisno.
68 90 95 106 48 2 analysisno.
88 99 116 92 93 108
44.39 43.40 43.48 43.93 43.96 43.65 SiO2 49.08 52.09 51.44 51.67 48.63 49.84 SiO2 58.97 56.9 59.2 58.15 58.35 56.17
0.53 0.34 0.40 0.32 0.38 0.41 Na2O 2.83 4.42 4.16 3.99 2.83 3.40 Na2O 7.43 6.48 7.62 7.18 7.29 6.31
0 0 0 0 0.01 0.02 K2O 0.03 0.01 0.02 0.06 0.05 0.03 K2O 0.03 0.03 0.06 0.04 0.03 0.02
0 0 0.06 0 0 0.02 TiO2 0 0 0.07 0 0 0.03 TiO2 0.01 0 0 0.01 0 0.01
0.10 0.09 0.13 0.06 0.03 0.21 FeO 0.02 0.04 0.04 0.01 0.04 0.05 FeO 0.03 0.07 0.04 0.21 0.26 0.06
35.17 35.31 35.47 35.75 35.42 35.59 Al2O3 31.78 29.56 29.76 29.99 31.56 30.41 Al2O3 25.39 26.76 25.42 25.89 25.46 27.23
0.01 0.02 0 0.01 0.02 0 MgO 0 0.01 0.01 0.01 0 0 MgO 0.01 0.01 0.01 0 0 0
19.39 19.62 19.67 19.74 19.77 20.06 CaO 15.73 13.35 13.49 13.65 15.57 14.73 CaO 7.57 9.31 7.56 8.39 7.91 9.71
0.01 0 0.02 0 0.01 0 MnO 0 0 0.04 0 0 0 MnO 0.01 0.05 0.02 0 0 0.05
99.66 98.83 99.23 99.82 99.60 99.98 Total 99.46 99.48 99.02 99.38 98.68 98.5 Total 99.45 99.61 99.93 99.86 99.3 99.57
8.23 8.13 8.12 8.14 8.17 8.10 Si 9.03 9.52 9.45 9.45 9.02 9.24 Si 10.59 10.29 10.59 10.44 10.52 10.15
0 0 0.01 0 0 0 Al 6.88 6.36 6.44 6.46 6.89 6.64 Al 5.37 5.68 5.35 5.47 5.41 5.79
Al 7.69 7.80 7 .80 7 .81 7.76 7.78 Ti 0 0 0.01 0 0 0 Ti 0 0 0 0 0 0
Fe2+
Mn
0.02 0.01 0.02 0.01 0.00 0.03 Fe2+ 0 0.01 0.01 0 0.01 0.01 Fe2+ 0 0.01 0.01 0.03 0.04 0.01
0 0 0 0 0 0 Mn 0 0 0.01 0 0 0 Mn 0 0.01 0 0 0 0.01
Mg 0 0.01 0 0 0.01 0 Mg 0 0 0 0 0 0 Mg 0 0 0 0 0 0
Ca
Na
K
Or
Ab
An
3.85 3.94 3.93 3.92 3.94 3.99 Ca 3.1 2.61 2.66 2.68 3.09 2.93 Ca 1.46 1.8 1.45 1.61 1.53 1.88
0.19 0.12 0.15 0.12 0.14 0.15 Na 1.01 1.57 1.48 1.42 1.02 1.22 Na 2.59 2.27 2.64 2.5 2.55 2.21
0 0 0 0 0 0 K 0.01 0 0 0.01 0.01 0.01 K 0.01 0.01 0.01 0.01 0.01 0.01
0 0 0 0 0.06 0.10 Ab 24.50 37.40 35.80 34.50 24.70 29.40 Ab 63.90 55.70 64.40 60.60 62.40 54.00
4.70 3.07 3.57 2.87 3.39 3.57 An 75.30 62.50 64.10 65.20 75.00 70.40 An 36.00 44.20 35.30 39.20 37.40 45.90
95.30 96.93 96.43 97.13 96.55 96.33 Or 0.10 0 0.10 0.30 0.30 0.20 Or 0.20 0.20 0.30 0.20 0.20 0.10
Structural formulas are calculated on the basis of 32 oxygens. Endmembers are calculated after Deer et al. (1986).