Ambiente sedimentario de la formación San Eduardo (eoceno medio), al noroeste del cantón General Villamil, Provincia del Guayas
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2021-09
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
Litológicamente la Formación San Eduardo de edad Eoceno Temprano – Eoceno Medio está conformada por Lutitas silícicas y calizas turbidíticas con restos de algas arrecifales, bien estratificadas y compactas. Al noroeste del cantón General Villamil, en el recinto San Antonio, la caliza que aflora está definida como parte de la Formación San Eduardo. La finalidad de este trabajo de titulación es determinar las propiedades petrográficas y bioestratigráficas para así definir su edad relativa y ambiente deposicional. Se describieron e interpretaron cuatro afloramientos y un punto de control; de los cuales se elaboraron veinte secciones delgadas con el fin de obtener información precisa de estas rocas. Modelos de clasificación para rocas carbonáticas y tipos de microfacies fueron utilizados para la determinación de las condiciones deposicionales. La litología comprende rocas carbonáticas tipo Grainstones, arcillolitas y lodolitas calcáreas. En base a la identificación de los foraminíferos planctónicos: Globoturborotalita ouachitaensis, Parasubbotina Inaequispira y Chiloguembelina Martini. Los ambientes de depositación definidos son de talud y plataforma abierta.
Lithologically, the San Eduardo Formation of Early Eocene – Middle Eocene age is made up of siliceous shales and turbiditic limestones with well-stratified and compact remains of reef algae. To the northwest of the General Villamil canton, in the San Antonio area, the limestone that emerges is defined as part of the San Eduardo Formation. The purpose of this research is to determine the petrographic and biostratigraphic properties in order to define their relative age and depositional environment. Four outcrops and a control point were described and interpreted; of which twenty thin sections were made in order to obtain precise information on these rocks. Classification models for carbonaceous rocks and types of microfacies were used to determine depositional conditions. The lithology includes Grainstones-type carbonaceous rocks, claystones and mudstones. Based on the identification of the planktonic foraminifera: Globoturborotalita ouachitaensis, Parasubbotina Inaequispira and Chiloguembelina Martini. Defined deposition environments are Foreslope and open platform.
Lithologically, the San Eduardo Formation of Early Eocene – Middle Eocene age is made up of siliceous shales and turbiditic limestones with well-stratified and compact remains of reef algae. To the northwest of the General Villamil canton, in the San Antonio area, the limestone that emerges is defined as part of the San Eduardo Formation. The purpose of this research is to determine the petrographic and biostratigraphic properties in order to define their relative age and depositional environment. Four outcrops and a control point were described and interpreted; of which twenty thin sections were made in order to obtain precise information on these rocks. Classification models for carbonaceous rocks and types of microfacies were used to determine depositional conditions. The lithology includes Grainstones-type carbonaceous rocks, claystones and mudstones. Based on the identification of the planktonic foraminifera: Globoturborotalita ouachitaensis, Parasubbotina Inaequispira and Chiloguembelina Martini. Defined deposition environments are Foreslope and open platform.
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EOCENO MEDIO, FORAMINÍFEROS PLANCTÓNICOS, AMBIENTE DEPOSICIONAL, SAN ANTONIO, MICROFACIES