Publicación: DISLOCACIÓN DE FACIES EN EL TOPE DE LA SECUENCIA CRETÁCICA DE LA SUBCUENCA DE NEIVA, VALLE SUPERIOR DEL MAGDALENA Y SUS IMPLICACIONES EN EL MODELO ESTRATIGRÁFICO SECUENCIAL COLOMBIANO
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Universidad Industrial de Santander
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La identificación de un abrupto cambio de facies y ambientes de depósito entre los sedimentos de la llamada Formación Monserrate y la Formación San Francisco del Grupo Guaduala, permite reconocer una Dislocación de Facies en el tope de la secuencia marina del Cretácico colombiano en el Valle Superior del Magdalena, atribuida al levantamiento de la Cordillera Central y a la acreción de bloques tectónicos al Oeste del Sistema de Fallas de Romeral.
Utilizando la integración de análisis detallados de sedimentología y estratigrafía en secciones de superficie y registros de pozos, se identificó la existencia de ambientes de depósito variantes entre el frente de costa medio y costa afuera proximal, que dominan la Formación Monserrate, mientras ambientes proximales, principalmente de lagos, pantanos y llanuras de inundación han sido interpretados para la Formación San Francisco. La ausencia de registro estratigráfico de la regresión de facies, desde ambientes marinos distales hasta ambientes continentales evidencia la discordancia o relación paraconforme de éstas unidades, donde los sedimentos de ambientes proximales fueron erodados o "bypassed".
Esta superfcie y sus superfcies correlativas deben ser interpretadas como el límite de la secuencia marina del Cretácico colombiano y estarían evidenciando además, la primera fase del levantamiento pre-Andino.
Palabras clave: Formaciones Monserrate y San Francisco, Cretácico Superior, dislocación de facies.
The identification of an abrupt facies change between the Monserrate and San Francisco formations allows us to identify a Facies Dislocation on top of the Cretaceous marine sequence of the Neiva sub-basin, due to the uplift of the Central Cordillera and the accretion of tectonic blocks, west of the Romeral Fault Zone. With an integrated detailed stratigraphic analysis in surface sections and wells, marine environments were identified for the Monserrate Formations, ranging from near offshore to middle shoreface. For the San Francisco Formation, continental environments were identified, ranging from coastal to fluvial plain, swamps and paleosoils. The lack of all the regression of facies, from deep marine environments to the continental realm is the principal evidence of the paraconformity between those units, implying that sediments from proximal environments were eroded or bypassed. This surface and their correlative surfaces have to be interpreted as the boundary of the marine sequence of the Cretaceous of Colombia in this area, and gives an evidence of the first pre-Andean uplift. Keywords: Monserrate and San Francisco Fms., facies dislocation, Upper Cretaceous.
The identification of an abrupt facies change between the Monserrate and San Francisco formations allows us to identify a Facies Dislocation on top of the Cretaceous marine sequence of the Neiva sub-basin, due to the uplift of the Central Cordillera and the accretion of tectonic blocks, west of the Romeral Fault Zone. With an integrated detailed stratigraphic analysis in surface sections and wells, marine environments were identified for the Monserrate Formations, ranging from near offshore to middle shoreface. For the San Francisco Formation, continental environments were identified, ranging from coastal to fluvial plain, swamps and paleosoils. The lack of all the regression of facies, from deep marine environments to the continental realm is the principal evidence of the paraconformity between those units, implying that sediments from proximal environments were eroded or bypassed. This surface and their correlative surfaces have to be interpreted as the boundary of the marine sequence of the Cretaceous of Colombia in this area, and gives an evidence of the first pre-Andean uplift. Keywords: Monserrate and San Francisco Fms., facies dislocation, Upper Cretaceous.