Artículos
Publicado 2019-01-08
Palabras clave
- Suite Metamórfica Rio Urubú,
- Química mineral,
- Biotita,
- Fugacidad de oxígeno,
- Magma parental
Cómo citar
Ballesteros-Camaro, C. A., & Ríos-Guerrero, J. (2019). Química mineral de biotitas en neises de la Suite Metamórfica Rio Urubú aflorantes en la Serra Repartimento, Dominio Guiana Central en el Cratón Amazónico, Brasil: implicaciones petrogenéticas. Boletín De Geología, 41(1), 97–116. https://doi.org/10.18273/revbol.v41n1-2019005
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Resumen
Ortoneises del basamento Paleoproteorozoico, de composición granítica de la Suite Metamórfica Rio Urubú (SMRU), relacionados a el evento pos-transamazónico son de amplia distribución en el Dominio Guiana Central (DGC) en el Cratón Amazónico, noreste de Brasil. En este estudio, fue estudiada la petrografía, mineralogía y química de biotitas en neises de biotitahornblenda pertenecientes a la SMRU. También fueron determinadas las condiciones de formación de estas biotitas y discutidas la importancia de estos minerales en términos petrogenéticos. Mediante los resultados de petrografía y de química mineral fueron clasificadas las biotitas en dos grupos distintos: 1) biotitas primarias clasificadas como Bt-IA, menos deformadas, de aspecto ígneo preservado y sin mayor orientación mineral y 2) biotitas primarias con tendencia a biotitas reequilibradas, con evidencia de deformación leve a moderada (Bt-IB), marcando la foliación de la roca y la estructura neísica, y siendo consistentes con los procesos tectono-metamórficos asociados a zonas de cizallamiento que afectaron el DGC. Los datos de microsonda electrónica muestran que los contenidos totales de Mg en biotitas menos deformadas (Bt-IA) son más altos, siendo clasificadas como biotitas
magnesianas, mientras que las biotitas deformadas (Bt-IB) presentan contenidos mayores en Fe y siendo clasificadas como biotitas ferríreras. Resultados para biotitas estrictamente primarias indican que las rocas de la SMRU son asociadas a granitos provenientes de magmas tipo-I y afinidad geoquímica calco-alcalina, con temperaturas (T) de cristalizaron para estas biotitas entre 720ºC – 760ºC, con condiciones de fugacidad de oxígeno (fO2) de -12,71 y -13,66 y razones de Fe/ (Fe+Mg) ≥ 0,50, mostrando una cristalización para estas rocas en el campo NNO, sugiriendo condiciones reductoras para el magma parental y también indicando una fuente típicamente de corteza para los magmas que dieron origen a esos granitos.
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Referencias
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Fraga, L.M.B. (1999). Geologia Estrutural. In: Programa de Levantamento Geológicos Básicos do Brasil. Roraima Central, Folhas NA.20-X-B e NA.20-X-D (inteiras), NA.20-X-A, NA.20-X-C, NA.21-V-A e NA.21-V-C (parciais). Escala 1:500.000. Estado do Amazonas, Brasília: CPRM, 1999. Relatório final, cap. 4, p. 117-128.
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