PROGRAMA GEOLOGIA DO BRASIL Contrato CPRM- UFPA Nº

Tabela 3.1: Análises modais de rochas do Tonalito Arco Verde da Folha Marajoara.
Variedades Petrográficas Bt-Anf-Tonalito Bt-Tonalito
Amostra / Mineral F-15 F-21B F-3B Média F-20B F-57A F-57F F-58-1 F-58C F-62N MAR-109 MAR-117 MAR-148 MAR-149 Média
Quartzo 30.89 31.81 17.68 26.79 43.81 38.80 26.67 33.22 27.42 35.68 36.40 34.80 27.40 28.20 33.24
Microclínio 1.26 4.12 3.45 2.94 2.66 4.60 2.96 2.41 2.86 1.65 7.60 3.20 1.40 1.20 3.05
Plagioclásio 49.53 53.69 63.88 55.70 44.18 47.06 59.11 52.62 63.51 52.58 48.90 45.80 52.10 52.80 51.87
Anfibólio 0.07 2.36 7.55 3.33 0.00
Biotita 13.29 6.61 5.86 8.59 8.83 8.27 9.66 11.17 3.12 8.88 3.90 14.10 13.80 13.10 9.48
Muscovita 1.28 0.01 0.51 0.60 0.09 0.07 0.11 Tr 0.71 Tr 1.40 Tr Tr Tr 0.24
Clorita 2.08 0.51 0.14 0.91 0.07 0.19 0.85 0.41 1.04 0.3 0.2 Tr 0.6 0.5 0.42
Epidoto 1.57 0.36 0.35 0.76 0.28 0.64 0.43 Tr 0.76 0.06 1 1.3 3.8 3.2 1.15
Opacos 0.02 0.53 0.56 0.37 0.07 0.04 0.21 0.18 0.59 0.85 Tr 0.40 0.20 0.20 0.27
Apatita Tr Tr Tr Tr Tr Tr Tr Tr Tr Tr 0.10 0.10 0.10 0.10 0.04
Titanita Tr Tr Tr Tr Tr Tr Tr Tr Tr Tr 0.20 0.40 0.50 0.11
Zircão Tr Tr Tr Tr Tr Tr Tr Tr Tr Tr Tr Tr Tr Tr 0.00
Máficos 17.03 10.37 14.46 13.95 9.25 9.14 11.15 11.76 5.51 10.09 5.30 15.80 18.80 17.50 11.43
A+P 50.79 57.81 67.33 58.64 46.84 51.66 62.07 55.03 66.37 54.23 56.50 49.00 53.50 54.00 54.92
Microclínio* 1.54 4.60 4.06 3.40 2.93 5.09 3.34 2.73 3.05 1.84 8.18 3.82 1.73 1.46 3.42
Quartzo* 37.82 35.49 20.80 31.37 48.33 42.89 30.05 37.64 29.24 39.68 39.18 41.53 33.87 34.31 37.67
Plagioclásio* 60.64 59.91 75.14 65.23 48.74 52.02 66.61 59.63 67.72 58.48 52.64 54.65 64.40 64.23 58.91
Abreviações: A – Álcali-feldspato; P – Plagioclásio; Ep – epidoto; Anf-anfibólio; Bt-biotita; * recalculado a 100%.
Programa Geologia do Brasil – Folha Marajoara
31