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Efrén Pérez Segura - Centro de Geociencias ::.. UNAM

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Tabla III<br />

Plutón Suite<br />

Composición MNBB(6) SLP(5) Adakitas* adakitico* La Posta** Mezcala***<br />

SiO2 65.06 65.34 64.66 67.3 67.79 64.14<br />

Al2O3 15.72 15.67 16.77 15.78 15.68 15.92<br />

Fe2O3 4.35 2.80 4.20 3.30 3.45 4.10<br />

MnO 0.06 0.02 0.08 0.05 0.05 0.10<br />

MgO 1.95 1.70 2.20 1.96 1.20 2.30<br />

CaO 3.76 2.12 5.00 3.67 3.86 4.20<br />

Na2O 4.26 4.66 4.09 4.19 3.51 3.90<br />

K2O 3.32 5.12 1.72 2.15 2.57 3.30<br />

TiO2 0.50 0.46 0.51 0.54 0.62 0.70<br />

P2O5 0.15 0.16 0.17 0.12 0.14 0.30<br />

Fe 2O3+MgO+MnO+TiO2 6.8 5.0 7.0 5.8 5.3 7.2<br />

K2O/Na 2O 0.8 0.9 0.4 0.5 0.7 0.8<br />

Sr 475.0 229.0 706.0 280.0 483.0 790.0<br />

Ni 14.0 30.0 24.0 24.0 7.0 21.0<br />

Cr 36.0 56.0 36.0 46.0 15.0 53.0<br />

Y 12.5 10.0 10.0 17.0 9.0 13.0<br />

Yb 1.3 0.9 0.9 1.1 1.1<br />

Sr/Y 37.0 24.0 68.7 16.5 54.0 61.0<br />

(La/Yb)N 9.6 14.1 14.2 11.0 23.0 20.0<br />

*Martin, 1999 **Tulloch y ***González -<br />

Kimbrough, 2003 Partida et al,<br />

2003

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