PROVENANCE IN THE SOUTHERN EXTREME OF THE MIDDLE MAGDALENA VALLEY DURING THE CENOZOIC: MEASUREMENTS BASED ON THE PALEOCURRENTS QUANTITATIVE ANALYSIS
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Universidad Industrial de Santander
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El estudio de paleocorrientes en la sucesión cenozoica del sector sur de la cuenca del Valle Medio del Magdalena (VMM) integró dos metodologías de medición, una en superficie y la otra en subsuelo, utilizando registros dipmeter. A partir de estos resultados se obtuvo un modelo de paleocorrientes para la secuencia comprendida entre el Eoceno superior – Plioceno inferior (formaciones Esmeraldas, Mugrosa y Colorado Grupo Real y Formación Mesa). Los resultados arrojaron como principal fuente de aporte a la cuenca la ancestral Cordillera Central para la secuencia sedimentaria, excepto durante dos épocas: en el Mioceno inferior (Formación Colorado) y en el Mioceno superior (Real Superior), donde la fuente de aporte cambia de la ancestral Cordillera Central a la Cordillera Oriental. Estas variaciones en las direcciones de los paleoflujos probablemente están asociadas con los primeros pulsos de levantamiento de la Cordillera Oriental durante el Mioceno temprano y tardío. Sin embargo la abundancia de materiales ígneos y metamórficos indican que la Cordillera Central continúo su actividad, aportando material a las formaciones depositadas durante estos periodos.
The paleocurrents studies in the cenozoic succession of southern area of the Middle Magdalena Valley Basin (MVB), have had integrate two measurement methodologies, one in surface and the other one in the subsurface, using dipmeter logs. From those results a paleocurrents model for the sequence between the Upper Eocene – Lower Pliocene (formations Esmeraldas, Mugrosa and Colorado, Real Group, and Mesa Formation) was obtained. The results showed as the main supply source to the basin, the ancestral Central Cordillera for the sedimentary sequence, with the exception of two epochs: Lower Miocene (Colorado Formation) and Upper Miocene (Upper Real), where the supply source changes from the ancestral Central Cordillera to the Eastern Cordillera. In the sense of the paleoflows these variations are probably associated with the first pulses of the Eastern Cordillera rise during the Early and Late Miocene. However the abundance of igneous and metamorphic materials indicates that the Central Cordillera keeps its activity, providing material to the formations deposited during those periods.
The paleocurrents studies in the cenozoic succession of southern area of the Middle Magdalena Valley Basin (MVB), have had integrate two measurement methodologies, one in surface and the other one in the subsurface, using dipmeter logs. From those results a paleocurrents model for the sequence between the Upper Eocene – Lower Pliocene (formations Esmeraldas, Mugrosa and Colorado, Real Group, and Mesa Formation) was obtained. The results showed as the main supply source to the basin, the ancestral Central Cordillera for the sedimentary sequence, with the exception of two epochs: Lower Miocene (Colorado Formation) and Upper Miocene (Upper Real), where the supply source changes from the ancestral Central Cordillera to the Eastern Cordillera. In the sense of the paleoflows these variations are probably associated with the first pulses of the Eastern Cordillera rise during the Early and Late Miocene. However the abundance of igneous and metamorphic materials indicates that the Central Cordillera keeps its activity, providing material to the formations deposited during those periods.
Keywords
Flow directions, Paleogene, Neogene, Central Cordillera, Eastern Cordillera, direcciones de flujo, Paleógeno, Neógeno, Cordilleras Central, Cordillera Oriental