Detrital zircon typology and U/Pb geochronology for the Miocene Ladrilleros-Juanchaco sedimentary sequence, Equatorial Pacific (Colombia) : new constraints on provenance and paleogeography in northwestern South America
Osorio-Granada, E. (Universidad de Caldas (Colòmbia). Departamento de Ciencias Geológicas)
Restrepo-Moreno, S. A. (Universidad Nacional de Colombia. Departamento de Geociencias y Medio Ambiente)
Muñoz-Valencia, J. A. (Universidad de Caldas (Colòmbia). Departamento de Ciencias Geológicas)
Trejos-Tamayo, R. A. (Universidad de Caldas (Colòmbia). Departamento de Ciencias Geológicas)
Pardo-Trujillo, Andrés (Universidad de Caldas (Colòmbia). Departamento de Ciencias Geológicas)
Barbosa-Espitia, A. A. (Universidad de Caldas (Colòmbia). Departamento de Ciencias Geológicas)

Fecha:	2017
Resumen:	Typology and internal texture analyses were performed on detrital zircons obtained from the Miocene sandstones of the Ladrilleros-Juanchaco sedimentary sequence (Colombia, Equatorial Pacific). This analysis was complemented with zircon U/Pb dating to identify typology-age associations as indicators of provenance of these sediments. Our results show that zircons with S and P dominant typology have internal structures/zoning that indicate mostly igneous and possibly some metamorphic origins. Morphometric results suggest little transport from source areas. Both typology and U/Pb data point to the Western Cordillera as the main source of the detrital materials of this sedimentary sequence. A paleogeographic reconstruction shows that during Late Miocene times there were significant portions of the Western Cordillera uplifted, eroding away and acting as a fluvio-topographic barrier blocking sediments from the Central Cordillera to reach the Pacific basins. Miocene plutons at the axis of the Western Cordillera were also probably exhumed and played a role as geomorphologically active massifs. This study demonstrates that typologic analysis on detrital zircon grains is a powerful tool as indicator of provenance and paleogeography in complex litho-tectonic areas where overlapping U/Pb signatures can lead to contradictory results.
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Miocene ; Ladrilleros-Juanchaco ; Sedimentary sequence ; Colombia's western Cordillera ; Provenance
Publicado en:	Geologica acta, Vol. 15 Núm. 3 (september 2017) , p. 201-215, ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/328014
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2017.15.3.4
DOI: 10.1344/GeologicaActa2017.15.3.4

15 p, 3.1 MB

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