Publicación: INDICADORES SEDIMENTOLÓGICOS DE LA EVOLUCIÓN TECTÓNICA DURANTE EL MIOCENO EN EL SINCLINAL DE NUNCHÍA, PIEDEMONTE DE LA CORDILLERA ORIENTAL DE COLOMBIA
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Universidad Industrial de Santander
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El área de estudio corresponde al Sinclinal de Nunchía, el cual se encuentra ubicado en el Piedemonte Oriental de la Cordillera Oriental de Colombia. Esta estructura se encuentra limitada por la Falla de Yopal al este y la Falla de Guaicaramo al oeste. En este sinclinal se encuentran expuestos sedimentos de edad Mioceno principalmente, que pertenecen a las Formaciones Carbonera (C1-C5), León y Guayabo. Se realizaron análisis sedimentológicos especialmente en la Formación Guayabo, con el fin de determinar la influencia tectónica durante su depositación. El análisis petrográfico de las areniscas indica la presencia de componentes asociados a las Formaciones del Cretácico Superior – Paleoceno de la Cordillera Oriental. La medición de paleocorrientes muestra una orientación prefencial hacia el SE, durante la depositación de la mayoría de las Formaciones estudiadas; con una inversión en la dirección del flujo hacia el W-NW durante la depositación de la parte Media de la Formación Guayabo preservada en el Sinclinal de Nunchía. Los datos recolectados permiten establecer una evolución estructural en el Sinclinal de Nunchía que fue activa durante la mayor parte del Mioceno. Esta evolución ocurrió al parecer de manera continua, aunque la fragmentación del registro geológico muestra periodos concretos de mayor actividad tectónica.
Palabras Clave: Sinclinal de Nunchía, evolución tectono-sedimentaria, Piedemonte Cordillera Oriental, paleocorrientes, proveniencia.
The study area corresponds to the Nunchia Syncline, which is located in the Eastern Foothills of the Eastern Cordillera of Colombia. This structure is bounded by the Yopal Thrust to the east, and Guaicaramo Thrust to the west. This syncline has mostly outcrops of Miocene units, which belong to the Carbonera (C1-C5), Leon and Guayabo Formations. Here we use sedimentologic data, especially in the Guayabo Formation, in order to determine the influence of active tectonics during its deposition. Petrographic analyses of sandstones indicate the presence of components associated with Upper Cretaceous – Paleocene Formations in the Eastern Cordillera. Paleocurrent orientation shows a preferential trend towards the SE during the deposition of most of the studied formations, with a reversal in flow direction towards the W-NW during the deposition of the Middle Guayabo Formation preserved in the Nunchia syncline. The collected data allows establishing a structural evolution in the Nunchia Syncline which was therefore active during most of the Miocene. This evolution appears to be continuous, although fragmentation of the geological record shows more specific periods of tectonic activity. Keywords: Nunchia Syncline, tectono-sedimentary evolution, Eastern Cordillera Foothills, paleocurrents, provenance.
The study area corresponds to the Nunchia Syncline, which is located in the Eastern Foothills of the Eastern Cordillera of Colombia. This structure is bounded by the Yopal Thrust to the east, and Guaicaramo Thrust to the west. This syncline has mostly outcrops of Miocene units, which belong to the Carbonera (C1-C5), Leon and Guayabo Formations. Here we use sedimentologic data, especially in the Guayabo Formation, in order to determine the influence of active tectonics during its deposition. Petrographic analyses of sandstones indicate the presence of components associated with Upper Cretaceous – Paleocene Formations in the Eastern Cordillera. Paleocurrent orientation shows a preferential trend towards the SE during the deposition of most of the studied formations, with a reversal in flow direction towards the W-NW during the deposition of the Middle Guayabo Formation preserved in the Nunchia syncline. The collected data allows establishing a structural evolution in the Nunchia Syncline which was therefore active during most of the Miocene. This evolution appears to be continuous, although fragmentation of the geological record shows more specific periods of tectonic activity. Keywords: Nunchia Syncline, tectono-sedimentary evolution, Eastern Cordillera Foothills, paleocurrents, provenance.