Geocronología de la Formación Cayo (K2) en Cerro Guayabal Provincia de Manabí
Fecha
2017
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
La cantera Uruzca se encuentra ubicada al Norte de la Estancia Las Palmas, se dedica a explotación de áridos en uno de los muchos bloques de la Formación Piñón de la Cordillera de la Costa, en esta localidad también afloran las Formaciones Cayo, Cerro y San Mateo. Se seleccionó una pequeña área de la concesión, donde aflora la Formación Cayo, con una superficie aproximada de 266 531 m2.
El objetivo del trabajo fue determinar la edad máxima de deposición de la Formación Cayo (K2), la procedencia de los clastos y el ambiente tectónico donde fueron depositados.
Para realizarlo se determinaron las edades de los zircones encontrados, estos pueden indicar la probable variabilidad de edades de dichos aportes o fuentes de clastos. Los resultados obtenidos se analizaron por medio de los diagramas poblacionales de edades de los zircones y la interpretación de las láminas
delgadas.
Como resultado se comprobó que la procedencia de los clastos que conforman las rocas de la Formación Cayo del área de estudio son piroclastos provenientes de un arco volcánico, un ligero aporte de fragmentos de otras rocas sedimentarias más antiguas y fragmentos de basalto procedentes de la
Formación Piñón. Con este trabajo se aportan datos geológicos importantes de la Formación Cayo (K2).
The Uruzca quarry is located North of Estancia Las Palmas. This mining concession is dedicated to the aggregate explotation from one of the many blocks of the Piñon Formation, located at the Coast Range. Here there are also outcrops from Cayo, Cerro y San Mateo Formations. In this Zone a small area was selected, where there are Cayo Formation outcrops, it is around 266 531 m2. The main objective is to determine the age of maximum depositon of the Cayo Formation (K2),the provenance of the clasts and the tectonic setting where they were deposited. To do it, the age of the found zircons were determined, this can shows the probable variability of ages and are able to indicate the probable variability of ages of the diferent sources of the sediment. The results obtained were analaized by population diagrams of the age of the zircones and interpretation of thin section of each sample. As a result, most of the clast provenance of the Cayo Formation in the study, was proven to be pyroclast from a volcanic arc, while a minor part conformed by fragments of older sedimentary rocks and basalt came from Piñon Formation. This work provides Cayo Formation (K2) important geologic data.
The Uruzca quarry is located North of Estancia Las Palmas. This mining concession is dedicated to the aggregate explotation from one of the many blocks of the Piñon Formation, located at the Coast Range. Here there are also outcrops from Cayo, Cerro y San Mateo Formations. In this Zone a small area was selected, where there are Cayo Formation outcrops, it is around 266 531 m2. The main objective is to determine the age of maximum depositon of the Cayo Formation (K2),the provenance of the clasts and the tectonic setting where they were deposited. To do it, the age of the found zircons were determined, this can shows the probable variability of ages and are able to indicate the probable variability of ages of the diferent sources of the sediment. The results obtained were analaized by population diagrams of the age of the zircones and interpretation of thin section of each sample. As a result, most of the clast provenance of the Cayo Formation in the study, was proven to be pyroclast from a volcanic arc, while a minor part conformed by fragments of older sedimentary rocks and basalt came from Piñon Formation. This work provides Cayo Formation (K2) important geologic data.
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ZIRCONES, CANTERA, ARCO VOLCÁNICO, LÁMINAS DELGADAS