Zircon U–Pb and Fission–Track Dating Applied to Resolving Sediment Provenance in Modern Rivers Draining the Eastern and Central Cordilleras, Colombia   

Cindy Lizeth URUEÑA–SUÁREZ, Mary Luz PEÑA–URUEÑA, Jimmy Alejandro MUÑOZ–ROCHA, Lorena del Pilar RAYO–ROCHA, Nicolás VILLAMIZAR–ESCALANTE, Sergio AMAYA–FERREIRA, Mauricio IBANEZ–MEJIA, and Matthias BERNET

https://doi.org/10.32685/pub.esp.37.2019.16

ISBN impreso obra completa: 978-958-52959-1-9

ISBN digital obra completa: 978-958-52959-6-4

ISBN impreso Vol. 3: 978-958-52959-4-0

ISBN digital Vol. 3: 978-958-53131-0-1​

Citation is suggested as: 

Urueña–Suárez, C.L., Peña–Urueña, M.L., Muñoz–Rocha, J.A., Rayo–Rocha, L.P., Villamizar–Escalante, N., Amaya–Ferreira, S., Ibañez–Mejia, M. & Bernet, M. 2020. Zircon U–Pb and fission–track dating applied to resolving sediment provenance in modern rivers draining the Eastern and Central Cordilleras, Colombia. In: Gómez, J. & Mateus–Zabala, D. (editors), The Geology of Colombia, Volume 3 Paleogene – Neogene. Servicio Geológico Colombiano, Publicaciones Geológicas Especiales 37, p. 469–490. Bogotá. https://doi.org/10.32685/pub.esp.37.2019.16​

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Abstract 

Determining the crystallization and cooling ages of detrital zircons from ancient sedimentary rocks or modern river sediments is a powerful method for tracing the sediment provenance and exhumation of orogenic mountain belts. Here, we present a study of the U–Pb and fission–track dating of detrital zircons from: (1) the sedimentary cover units of the Eastern Cordillera between Bogotá and Villavicencio and (2) the modern river sediments of the Guatiquía and Guayuriba Rivers, which drain the eastern flank of the Eastern Cordillera, and those of the Magdalena River at Girardot, which drains the western flank of the Eastern Cordillera and the eastern part of the Central Cordillera. We use our data to highlight the advantages and limitations of using zircon U–Pb and fission–track dating in provenance studies, including the identification of original source areas, sediment recycling and the difficulty of detecting amagmatic orogens in the detrital zircon record. The data obtained in this study allow us to better understand the association between the exhumation of sources and their detrital zircon signatures in the modern rivers that drain part of the Eastern Cordillera.

Keywords: Detrital zircon, Eastern Cordillera of Colombia, Exhumation, Provenance.​

​Resumen

La determinación de edades de cristalización y de enfriamiento de circones detríticos en rocas sedimentarias antiguas o sedimentos de ríos actuales es un poderoso método para trazar la proveniencia del sedimento y la exhumación de cinturones orogénicos. Aquí presentamos un estudio de dataciones U–Pb y trazas de fisión en circones de (1) las unidades sedimentarias de la cordillera Oriental entre Bogotá y Villavicencio y (2) sedimentos fluviales actuales de los ríos Guatiquía y Guayuriba, los cuales drenan el flanco oriental de la cordillera Oriental, y sedimentos del río Magdalena en Girardot, que drena el flanco occidental de la cordillera Oriental y la parte oriental de la cordillera Central. Usamos nuestros datos para resaltar las ventajas y limitaciones de usar dataciones U–Pb y trazas de fisión para estudios de proveniencia, incluyendo la identificación de áreas fuente originales, el reciclaje de sedimentos y la dificultad de detectar orógenos no magmáticos en el registro de circones detríticos. Los datos obtenidos en este estudio nos permitieron entender mejor la asociación entre la exhumación de fuentes y sus firmas detríticas en ríos actuales que drenan parte de la cordillera Oriental.

Palabras clave: circón detrítico, cordillera Oriental de Colombia, exhumación, proveniencia.

Abbreviations

CA–ID–TIMS                         Chemical abrasion thermal ionization mass spectrometry isotopic dilution

CL                                                              Cathodoluminescence

ID–TIMS                                          Thermal ionization mass spectrometry isotopic dilution

LA–ICP–MS                             Laser ablation inductively coupled plasma mass spectrometry

LA–SC–ICP–MS               Laser ablation single–cell inductively coupled plasma mass spectrometry

SEM                                                       Scanning electron microscope

SGC                                                       Servicio Geológico Colombiano

ZFT                                                        Zircon fission–track

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