Estratigrafía y procedencia de los sedimentos de la Formación Planta Ancón, sector oeste de la localidad Anconcito, provincia de Santa Elena
Fecha
2019
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Facultad de Ciencias Naturales. Universidad de Guayaquil
Resumen
En la provincia de Santa Elena en el margen suroeste se ubica la localidad de
Anconcito, lugar donde se llevó acabo el desarrollo del trabajo de titulación en los
acantilados de la parte oeste, donde aflora la Formación Punta Ancón (Eoceno
Medio medio-Eoceno Medio tardío), esta Formación representa la parte superior
del Grupo Ancón (Eoceno Medio). Litológicamente consiste de areniscas con
alternancia centimétricas de limolitas.
Se levantaron 4 columnas; cada una con su respectiva descripción, además de
determinar el tipo de sedimento usando granulometría, así mismo se definió el
paleoambiente del área de estudio y finalmente se procedió a interpretar la
procedencia de los materiales del sector de estudio en los acantilados de Anconcito
de la Península de Santa Elena.
En la zona de estudio se analizaron e interpretaron 7 muestras para análisis
granulométrico; las mismas que ayudaron a definir el tipo de sedimento. Las 8
muestras para bioestratigrafía de las cuales tres resultaron estériles; el radiolario
datador Podocyrtis (Lampterium) trachodes indica una edad relativa de Eoceno Medio medio-Eoceno Medio tardío y el paleo-ambiente de depositación como Marino de Plataforma Externa por la abundancia del radiolario (Lithocyclia ocellus) y las 7 muestras asignadas para análisis químicos se usaron para determinar la procedencia tectónica de los materiales ploteando los resultados de óxidos mayoritarios utilizando diagramas ternarios que indican un ambiente de Orógeno Reciclado con tendencia a Arco Disectado. Posteriormente usando los elementos trazas de los elementos de tierras raras como: Th, Sc, Hf, La, Co; se realizaron las siguientes relaciones de La-Th y Sc; en done se evidencia una proveniencia de Arco Magmático Oceánico, a su vez los resultados obtenidos con la relación Th, Hf y Co indican una proveniencia de los sedimentos de Corteza Oceánica.
Santa Elena Province in the margin Southwest is located Anconcito, place where development the work of qualification in the cliffs of the western part, where the Formation Punta Ancon (Middle Eocene middle-late Middle Eocene), this formation represents the top of the Ancon Group (Middle Eocene). Litologicamente consists of sandstones with centimeter alternation of siltstones. It is developed four columns; each one with their respective description, in addition determined the type of sediment grain size, as well using the same defined the paleoenvironment of the study area and finally proceeded to interpret the origin of the materials in the sector of study on the cliffs of Anconcito Santa Elena Province. In the area of study analyzed and interpreted 7 samples for sieve analysis; these helped to define the type of sediment. The 8 samples for biostratigraphy of which three were barren; the Radiolario datador Lampterium trachodes Podocyrtis (Lampterium) indicates a relative age of Middle Eocene late-middle Middle Eocene and the paleo-environment of deposition as Marino of external platform because of the abundance of Radiolario (Lithocyclia Ocellus) and the 7 samples assigned for chemical analysis were used to determine the origin tectonics of the materials by plotting the results of majoritarian oxides using ternary diagrams that indicate an environment of Orogeno recycling with a tendency to Disectado Arc. Subsequently using the trace elements of the rare earth elements such as: Th, Sc, Hf, La, Co; the following relationships of La-Th and Sc were made; where a provenance of Magmatic Oceanic Arc is evidenced, in turn the results obtained with the relation Th, Hf and Co indicate a provenience of the Oceanic Bark sediments.
Santa Elena Province in the margin Southwest is located Anconcito, place where development the work of qualification in the cliffs of the western part, where the Formation Punta Ancon (Middle Eocene middle-late Middle Eocene), this formation represents the top of the Ancon Group (Middle Eocene). Litologicamente consists of sandstones with centimeter alternation of siltstones. It is developed four columns; each one with their respective description, in addition determined the type of sediment grain size, as well using the same defined the paleoenvironment of the study area and finally proceeded to interpret the origin of the materials in the sector of study on the cliffs of Anconcito Santa Elena Province. In the area of study analyzed and interpreted 7 samples for sieve analysis; these helped to define the type of sediment. The 8 samples for biostratigraphy of which three were barren; the Radiolario datador Lampterium trachodes Podocyrtis (Lampterium) indicates a relative age of Middle Eocene late-middle Middle Eocene and the paleo-environment of deposition as Marino of external platform because of the abundance of Radiolario (Lithocyclia Ocellus) and the 7 samples assigned for chemical analysis were used to determine the origin tectonics of the materials by plotting the results of majoritarian oxides using ternary diagrams that indicate an environment of Orogeno recycling with a tendency to Disectado Arc. Subsequently using the trace elements of the rare earth elements such as: Th, Sc, Hf, La, Co; the following relationships of La-Th and Sc were made; where a provenance of Magmatic Oceanic Arc is evidenced, in turn the results obtained with the relation Th, Hf and Co indicate a provenience of the Oceanic Bark sediments.
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FORMACIÓN PUNTA ANCÓN, RADIOLARIO, ÓXIDOS MAYORITARIOS