Geología de Formación Cayo del Cretácico Superior, al norte de Guayaquil (Campus Mapasingue) provincia del Guayas
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Fecha
2023
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
La Formación Cayo del Cretácico Superior, está conformada por secuencia de rocas
volcanoclásticas y sedimentarias, este trabajo se enfocó en definir la geología de la
formación aflorada en el Campus Mapasingue, donde se identificó y describió sus facies,
clasificando petrográficamente e identificando su ambiente deposicional. Reconociendo
litofacies de toba masiva y toba con estratificación laminar, las cuales fueron descritas
aplicando la bibliografía propuesta por Branney y Kokelaar y la descripción petrográfica
basada en diagramas de composición mineralógica y de tamaño de grano de tabulación
porcentual, propuestos por Pettijon, 1973 y Fisher R. V. & Schmincke H, 1984. Los tipos de
tobas identificados fueron Toba Lítica y Toba Cristalina, el tamaño de estas iba desde Toba
a Toba de Lapilli. Los resultados muestran un ambiente volcánico explosivo submarino con
un proceso de formación genético sin-eruptivo, formando grandes depósitos de material
masivo volcanoclástico y eventos post eruptivos de material fino en suspensión.
The Cayo Formation of the Upper Cretaceous, is made up of a sequence of volcaniclastic and sedimentary rocks, this work focused on defining the geology of the outcrop formation in the Mapasingue Campus, where its facies were identified and described, petrographically classified and identifying its depositional environment. Recognizing lithofacies of massive tuff and tuff with laminar stratification, which were described applying the bibliography proposed by Branney and Kokelaar and the petrographic description based on diagrams of mineralogical composition and percentage tabulation grain size, proposed by Pettijon, 1973 and Fisher R. V. & Schmincke H, 1984. The types of tuffs identified were Lithic Tuff and Crystalline Tuff, the size of which ranged from Tuff to Lapilli Tuff. The results show a submarine explosive volcanic environment with a syn-eruptive genetic formation process, forming large deposits of massive volcanoclastic material and post-eruptive events of fine material in suspension.
The Cayo Formation of the Upper Cretaceous, is made up of a sequence of volcaniclastic and sedimentary rocks, this work focused on defining the geology of the outcrop formation in the Mapasingue Campus, where its facies were identified and described, petrographically classified and identifying its depositional environment. Recognizing lithofacies of massive tuff and tuff with laminar stratification, which were described applying the bibliography proposed by Branney and Kokelaar and the petrographic description based on diagrams of mineralogical composition and percentage tabulation grain size, proposed by Pettijon, 1973 and Fisher R. V. & Schmincke H, 1984. The types of tuffs identified were Lithic Tuff and Crystalline Tuff, the size of which ranged from Tuff to Lapilli Tuff. The results show a submarine explosive volcanic environment with a syn-eruptive genetic formation process, forming large deposits of massive volcanoclastic material and post-eruptive events of fine material in suspension.
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Cayo, Volcanoclásticos, Facies, Toba, Lapilli