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| Format: | Artículo científico |
| Langue: | en |
| Publié: |
Universitat de Barcelona
2017
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| Accès en ligne: | https://www.redalyc.org/articulo.oa?id=50552539004 https://www.redalyc.org/journal/505/50552539004/ https://www.redalyc.org/journal/505/50552539004/html/ https://www.redalyc.org/journal/505/50552539004/50552539004.epub https://www.redalyc.org/journal/505/50552539004/movil |
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Table des matières:
- 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 E. OSORIO-GRANADA S.A. RESTREPO-MORENO J.A. MUÑOZ-VALENCIA R.A. TREJOS- TAMAYO A. PARDO-TRUJILLO A.A. BARBOSA-ESPITIA Ciencias de la Tierra Miocene Provenance Ladrilleros Colombia western Cordillera Juanchaco sedimentary sequence 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 sediment provenance. Our results show that zircons with S and P dominant typologies have internal structures/zoning indicative of igneous, and potentially also metamorphic, origins. Morphometric results suggest limited transport from source areas. Both typology and U/Pb data point to the western Cordillera as the principal source of detrital materials for this sedimentary sequence. A paleogeographic reconstruction shows that, during the Late Miocene, significant portions of the western Cordillera were uplifted and actively eroding, thereby forming a fluvio-topographic barrier that prevented sediments from the central Cordillera reaching the Pacific basins. Exhumed Miocene plutons located along the axis of the western Cordillera may also have played a role as geomorphologically active massifs. This study demonstrates that typologic analysis on detrital zircon grains is a useful tool for establishing provenance and paleogeography in complex litho-tectonic areas where overlapping U/Pb signatures can lead to contradictory results.. 2017 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50552539004 https://www.redalyc.org/journal/505/50552539004/ https://www.redalyc.org/journal/505/50552539004/html/ https://www.redalyc.org/journal/505/50552539004/50552539004.epub https://www.redalyc.org/journal/505/50552539004/movil en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.3 Vol.15