Tectono-sedimentary evolution of the northern part of the Esmeraldas-Borbón Basin (Northern Ecuadorian Forearc)
The Cretaceous to Neogene tectonic history of the northwestern margin of South America, involving accretion and interactions between the Caribbean and South American plates, is complex. In Ecuador, geochemical and geochronological studies have provided a framework for interpretations of 2D paleotect...
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| Format: | bachelorThesis |
| Idioma: | eng |
| Publicat: |
2020
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| Matèries: | |
| Accés en línia: | http://repositorio.yachaytech.edu.ec/handle/123456789/265 |
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Afegir etiqueta | Sumari: | The Cretaceous to Neogene tectonic history of the northwestern margin of South America, involving accretion and interactions between the Caribbean and South American plates, is complex. In Ecuador, geochemical and geochronological studies have provided a framework for interpretations of 2D paleotectonic evolutions. In spite of this, there is still uncertainty regarding the tectonic history of this margin. Even though there are some studies from the Manabí and Progreso basins in the southern Ecuadorian forearc, tectono-sedimentary studies proposing paleotectonic reconstructions are missing in the literature. In this work, we use a set of industry seismic lines, combined with well data from the northern Ecuadorian forearc basin, specifically from the Esmeraldas-Borbón Basin, to carry out such a study. With this data, structural and isopach maps were made to know the tectono-sedimentary evolution of a selected study area. This research shows the existence of structures affecting a Late Cretaceous to Neogene syn-compressional succession which is divided in eight depositional sequences. Moreover, a tectono-sedimentary evolution is interpreted between Late Cretaceous and Early Miocene. This evolution consisted by the following three environments: 1) shallow to deep carbonate platform, Late Cretaceous to Early Oligocene, with a southeast flow direction; 2) shallow to deep siliciclastic platform, Early to Late Oligocene, with a northeastern flow direction; and 3) platform to deep sea fan siliciclastic system, Late Oligocene to Late Miocene with northeastern flow direction. The results of this study are of great relevance for any future interpretation related to the interactions between the Caribbean, Nazca, and South American plates. |
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