Estudios petrográficos y geoquímicos del afloramiento ígneo en el área del peaje Chivería, cantón Nobol, provincia del Guayas.
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2020-10
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
El objetivo del estudio es para determinar la procedencia genética de los afloramientos del sector Peaje Chivería, en el cantón Nobol. Del que se procedió a recolectar 10 muestras, para obtener resultados en el campo de la petrografía y geoquímica. Se destinaron 7 muestras para procesos de secciones delgadas y 3 para análisis químico de roca total. La metodología se basó en la interpretación petrológica según el diagrama Streckeisen. Para la clasificación de la química de las rocas, se ejecutó en análisis multielemental por fusión de borato de litio en los laboratorios Inspectorate Services Perú. Por lo que se consiguió 7 resultados Óxidos Mayores y menores y Elementos trazas; lo que permitió emplear diagramas de tipo Harker, ternarios de Total Alkalis Silica, gráficos Spider en REE, discriminación tectónica y clasificación de la normativa CIPW; lo que se obtuvo el índice termodinámico hipotéticos. Lo que demostró dos grupos de rocas; correspondiente a lavas acidas del tipo Basalto con alteraciones cloríticas; enriquecidos en hierro y magnesio, con un porcentaje en SiO2 de 49% y una ceniza fina con una interpretación en SiO2 de 60% que se determina con una composición intermedia. Ambas pertenecen a la serie magmática toléiticos. El afloramiento se interpretó en un ambiente de tipo E-MORB superior
The objective of the study is to determine the genetic origin of the outcrops in the Chivería Toll sector, in Nobol County. From which 10 samples were collected, to obtain results in the field of petrography and geochemistry. Seven samples were destined for thin section processes and three for total rock chemical analysis. The methodology was based on the petrological interpretation according to the Streckeisen diagram. For the classification of the chemistry of the rocks, it was executed in multielement analysis by lithium borate fusion in the laboratories Inspectorate Services Peru. Therefore, 7 Major and Minor Oxides and Trace Elements results were obtained; which allowed the use of Harker type diagrams, Total Alkalis Silica ternaries, Spider graphs in REE, tectonic discrimination and classification of the CIPW standard; which resulted in the hypothetical thermodynamic index. This showed two groups of rocks; corresponding to acid lava of the Basalt type with chlorotic alterations; enriched in iron and magnesium, with a percentage in SiO2 of 49% and a fine ash with an interpretation in SiO2 of 60% which is determined with an intermediate composition. Both belong to the magmatic-toleitic series. The outcrop was interpreted in a higher E-MORB type environment.
The objective of the study is to determine the genetic origin of the outcrops in the Chivería Toll sector, in Nobol County. From which 10 samples were collected, to obtain results in the field of petrography and geochemistry. Seven samples were destined for thin section processes and three for total rock chemical analysis. The methodology was based on the petrological interpretation according to the Streckeisen diagram. For the classification of the chemistry of the rocks, it was executed in multielement analysis by lithium borate fusion in the laboratories Inspectorate Services Peru. Therefore, 7 Major and Minor Oxides and Trace Elements results were obtained; which allowed the use of Harker type diagrams, Total Alkalis Silica ternaries, Spider graphs in REE, tectonic discrimination and classification of the CIPW standard; which resulted in the hypothetical thermodynamic index. This showed two groups of rocks; corresponding to acid lava of the Basalt type with chlorotic alterations; enriched in iron and magnesium, with a percentage in SiO2 of 49% and a fine ash with an interpretation in SiO2 of 60% which is determined with an intermediate composition. Both belong to the magmatic-toleitic series. The outcrop was interpreted in a higher E-MORB type environment.
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Estudios petrográficos y geoquímicos del afloramiento ígneo en el área del peaje chivería, cantón Nobol, provincia del Guayas., SERIE MAGMÁTICA