Determinación del ambiente tectónico de procedencia de la formación Tablazo al oeste de la Provincia de Santa Elena – Ecuador.
Fecha
2021
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
La Formación Tablazo, carece de estudios geoquímicos que estén enfocados a la procedencia de la formación de los sedimentos que constituyeron las rocas, esta formación de edad pleistoceno se extiende en la isla Puná en las penínsulas de Manta y de Santa Elena. El objetivo de este estudio es determinar el ambiente tectónico de procedencia de la Formación Tablazo al oeste de la provincia de Santa Elena – Ecuador. Para lo cual, se recolectaron 8 muestras; 4 para procesos de secciones delgadas y 4 para análisis químico de roca total. La interpretación geoquímica de los elementos mayores y algunos elementos menores fueron realizas por espectrometría de emisión con plasma inductivamente acoplado (ICP-ES), otros elementos menores y tierras raras fueron analizados mediante la técnica de espectrometría de masas con plasma inductivamente acoplado (ICP-MS). Lo que permitió emplear diagramas binarios y ternarios para procedencia tectónica por y gráficos multielementales en REE. Como resultado los sedimentos de las rocas de la formación provienen de un arco de isla continental (AIC). La relación Y/Th en las muestras G01 y G02 indican que las rocas calizas son carbonatos marinos y conservaron sus principales propiedades químicas. Para la interpretación petrográfica se utilizó la metodología de Dunham y Folk (1962) para la clasificación de rocas carbonáticas y los tipos de microfacies de Wilson (1975) y Flugel (2004) para identificar el ambiente deposicional. El análisis petrográfico indicó que las rocas son grainstone (Bioesparita) y packstone (Biomicrita). El ambiente sedimentario es Plataforma Retrabajada a Plataforma de Laguna Abierta de Rampa Interna.
The Tablazo formation lacks geochemical studies that are focused on the origin of the formation of the sediments that constituted the rocks, this Pleistocene age formation extends on Puná Island in the Manta and Santa Elena peninsulas. The objective of this study is to determine the tectonic environment of origin of the Tablazo formation west of the province of Santa Elena - Ecuador. For which, 8 samples were collected; 4 for thin section processes and 4 for total rock chemical analysis. The geochemical interpretation of major elements and some minor elements were performed by inductively coupled plasma emission spectrometry (ICP-ES), other minor elements and rare earths were analyzed by inductively coupled plasma mass spectrometry (ICP- MS). This made it possible to use binary and ternary diagrams for tectonic provenance by and multi-element graphs in REE. As a result, the sediments in the formation rocks come from a continental island arc (AIC). The Y / Th ratio in samples G01 and G02 indicate that the limestone rocks are marine carbonates and preserved their main chemical properties. For the petrographic interpretation, the methodology of Dunham and Folk (1962) was used for the classification of carbonate rocks and the types of microfacies of Wilson (1975) and Flugel (2004) to identify the depositional environment. Petrographic analysis indicated that the rocks are grainstone (Biosparite) and packstone (Biomicrite). The sedimentary environment is Retracted Platform to Internal Ramp Open Lagoon Platform.
The Tablazo formation lacks geochemical studies that are focused on the origin of the formation of the sediments that constituted the rocks, this Pleistocene age formation extends on Puná Island in the Manta and Santa Elena peninsulas. The objective of this study is to determine the tectonic environment of origin of the Tablazo formation west of the province of Santa Elena - Ecuador. For which, 8 samples were collected; 4 for thin section processes and 4 for total rock chemical analysis. The geochemical interpretation of major elements and some minor elements were performed by inductively coupled plasma emission spectrometry (ICP-ES), other minor elements and rare earths were analyzed by inductively coupled plasma mass spectrometry (ICP- MS). This made it possible to use binary and ternary diagrams for tectonic provenance by and multi-element graphs in REE. As a result, the sediments in the formation rocks come from a continental island arc (AIC). The Y / Th ratio in samples G01 and G02 indicate that the limestone rocks are marine carbonates and preserved their main chemical properties. For the petrographic interpretation, the methodology of Dunham and Folk (1962) was used for the classification of carbonate rocks and the types of microfacies of Wilson (1975) and Flugel (2004) to identify the depositional environment. Petrographic analysis indicated that the rocks are grainstone (Biosparite) and packstone (Biomicrite). The sedimentary environment is Retracted Platform to Internal Ramp Open Lagoon Platform.
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FORMACIÓN TABLAZO, PROCEDENCIA, CARBONATOS MARINOS, MICROFACIES, GEOQUÍMICA