UnB Nº. 071/PR/05 - CPRM

Th (ppm)
140
120
100
80
60
40
20
0
musc granito Au1
bt-musc granito Au2
bt granito Au4
tonalito Au3
0 0,5 1 1,5 2 2,5 3 3,5
K 2 O/Na 2 O
Figura 29: Individualização das fácies da Suíte Aurumina, ressaltando os elevados teores de Th
nas fácies Au2 e Au4.
Tabela 1: Análises químicas de granitos da Suíte Aurumina, executadas para o Programa Geologia do Brasil
em 2005.
muscovita granito biot-musc granito biotita granito tonalito
amostra 05-VII 05-VII 05-IX 05-IX 05-XIII 05-XIII 05-IX 05-IX 05-VIII TER 2 05-V 05-XI 05-XIV 05-XIV
169 204 145b 145a 146a 146c 142 145a 4 12a 64 76 326
SiO2(%) 74.48 72.19 73.39 71.7 73.77 73.84 73.63 70.56 70.56 70.16 72.07 73.96 66.85 62.58
TiO2 0.04 0.17 0.11 0.23 0.21 0.52 0.54 0.51 0.49 0.25 0.08 0.19 0.57 0.66
Al2O3 14.96 15.29 14.94 15.76 14.54 12.05 13.2 15.19 14.24 16.03 16.32 14.23 16.1 16.91
Fe2O3(t) 0.51 1.34 1.24 1.58 1.21 3.1 2.49 2.41 3.15 1.51 0.83 2.52 4.05 5.23
MnO 0.04 0.01 0.01 0.02 0.03 0.01 0.01 0.03 0.02 0.01 0.02 0.04 0.07 0.08
MgO 0.12 0.34 0.3 0.41 0.24 0.73 0.49 0.57 0.39 0.34 0.29 0.43 1.51 2.37
CaO 0.88 0.97 0.49 0.59 0.33 0.22 0.39 0.74 1 0.45 2.22 0.8 2.37 3.84
Na2O 3.72 3.43 3.06 2.93 3.21 0.04 1.93 2.35 2.61 2.31 5.6 5.31 3.92 3.52
K2O 4.57 4.51 4.85 5.03 5.25 4.42 5.62 5.27 5.67 6.66 1.45 1.64 2.85 2.83
P2O5 0.12 0.19 0.27 0.28 0.17 0.14 0.32 0.44 0.15 0.4 0.04 0.07 0.15 0.17
P.F. 0.6 1.4 1.2 1.3 1 4.9 1.2 1.3 1.3 1.2 0.9 0.8 1.3 1.5
Total 100.04 99.84 99.86 99.83 99.96 99.99 99.82 99.42 99.58 99.32 99.82 99.99 99.74 99.71
Be(ppm) 5 2 1 2 2 2