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Sedimentitas marinas del Neógeno en la bahía de Tumaco, Nariño

 Volume 3 Chapter 16

Chapter 16

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

By 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

Pages 335–347

Manuscript accepted October 29, 2018


Abstract 


Determining the crystallization and cooling ages of detrital zircon 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: (i) the sedimentary cover units of the Eastern Cordillera between Bogotá and Villavicencio and (ii) the modern river sediments of the Guatiquia 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 Colombia, exhumation, provenance.