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      ORIGIN OF A DOUBLE FOREARC BASIN: THE EXAMPLE OF THE TUMACO - MANGLARES BASIN, NORTHWESTERN SOUTHAMERICA Translated title: ORIGEN DE UNA CUENCA DE ANTEARCO DOBLE: EJEMPLO DE LA CUENCA DE TUMACO - MANGLARES, NOROCCIDENTE DE SURAMERICA

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          Abstract

          ABSTRACT The subsidence and uplift history of the forearc system of southwestern Colombia and northern Ecuador margin is complex and reveals several stages of deformation. The sequential stratigraphy of the forearc area shows the development of three megasequences (M1 to M3). The basal megasequence corresponds to the basement of the forearc, which was formed at the end of the Mesozoic and at the beginning of the Cenozoic and accreted against the Northwestern part of South America related to the accretion of the Late Cretaceous - Paleocene oceanic plateau. This accretion occurred in a transpressional regime. The second megasequence is composed by deep water sediments, recording the transition between transpressional to compressional stages of the margin from the Late Eocene to the Middle Miocene. The third megasequence is characterized by shallow water sediments strongly constrained by the compressional stage of the margin and the uplift activity of the structural highs since the Late Miocene up to present. The structural geometry of the margin is characterized by basement thrusts that deformed the forearc crust. Westward, the forearc zone -according to the support of the overriding plate -is divided into mantle wedge and lower plate domains. The margin evolution suggests that the subducting plate geodynamical changes affect strongly the interplate coupling and mantle wedge and produce changes in the subsidence or uplift through the double forearc basin systems.

          Translated abstract

          RESUMEN La historia de subsidencia y levantamiento del Sistema de antearco de la margen SW de Colombia y Norte de Ecuador es compleja y revela numerosos estados de deformación. La estratigrafía secuencial de la zona de antearco evidencia el desarrollo de tres megasecuencias (M1 a M3). La megasecuencia basal está relacionada con la acreción de una meseta oceánica formada a finales del Mesozoico a principios del Cenozoico correspondiente al basamento de la zona de antearco. Esta acreción ocurre en un estado de régimen transpresional. La segunda megasecuencia está compuesta por sedimentos de aguas profundas, registrando la transición entre los estados transpresionales a compresionales de la margen desde finales del Eoceno hasta mediados del Mioceno. La tercer megasecuencia se caracteriza por sedimentos acumulados en ámbitos sedimentarios poco profundos con una fuerte incidencia del estado compresional de la margen y la actividad de levantamiento de los altos estructurales desde finales del Mioceno hasta el reciente. La geometría estructural de la margen es caracterizada por cabalgamientos de escamación gruesa que deforman la corteza del antearco. El borde occidental de la zona de antearco, de acuerdo al soporte que tenga la placa superior, se puede dividir en un dominio soportado por la cuña mantelica y un dominio soportado por la placa subyacente. La evolución de la margen sugiere que los cambios geodinámicos de la placa subducente afecta fuertemente el contacto interplaca y la cuña mantelica, y produce cambios en la subsidencia o levantamiento a través del sistema de cuencas de antearco doble.

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          Most cited references 81

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          Chronology of fluctuating sea levels since the triassic.

          Advances in sequence stratigraphy and the development of depositional models have helped explain the origin of genetically related sedimentary packages during sea level cycles. These concepts have provided the basis for the recognition of sea level events in subsurface data and in outcrops of marine sediments around the world. Knowledge of these events has led to a new generation of Mesozoic and Cenozoic global cycle charts that chronicle the history of sea level fluctuations during the past 250 million years in greater detail than was possible from seismic-stratigraphic data alone. An effort has been made to develop a realistic and accurate time scale and widely applicable chronostratigraphy and to integrate depositional sequences documented in public domain outcrop sections from various basins with this chronostratigraphic framework. A description of this approach and an account of the results, illustrated by sea level cycle charts of the Cenozoic, Cretaceous, Jurassic, and Triassic intervals, are presented.
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            Relative motion of the Nazca (Farallon) and South American Plates since Late Cretaceous time

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              Subsidence of the Atlantic-type continental margin off New York

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                Author and article information

                Journal
                ctyf
                CT&F - Ciencia, Tecnología y Futuro
                C.T.F Cienc. Tecnol. Futuro
                Instituto Colombiano del Petróleo (ICP) - ECOPETROL S.A. (Bucaramanga, Santander, Colombia )
                0122-5383
                2382-4581
                June 2020
                : 10
                : 1
                : 67-92
                Affiliations
                Bogotá D. C orgnameEcopetrol orgdiv1Vicepresidencia de Exploración
                Article
                S0122-53832020000100067 S0122-5383(20)01000100067
                10.29047/01225383.161

                This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 99, Pages: 26
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