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| Format: | Artículo científico |
| Langue: | en |
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ECOPETROL S.A.
2016
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| Accès en ligne: | https://www.redalyc.org/articulo.oa?id=46550993001 |
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Table des matières:
- BASEMENT CHARACTERISTICS IN THE LOWER MAGDALENA VALLEY AND THE SINÚ AND SAN JACINTO FOLD BELTS: EVIDENCE OF A LATE CRETACEOUS MAGMATIC ARC AT THE SOUTH OF THE COLOMBIAN CARIBBEAN Alejandro Silva-Arias Liliana-Andrea Páez-Acuña Daniel Rincón-Martínez Javier-Alfonso Tamara-Guevara Pedro-David Gomez-Gutierrez Eduardo López-Ramos Sandra-Milena Restrepo-Acevedo Luis-Carlos Mantilla-Figueroa Victor Valencia Ingeniería Caribbean subduction Magmatic Arc South Americ Pb geochronology The onset of subduction in the Caribbean Plate under the South American Plate allowed the develop- ment of an Active Continental Margin; the age of onset, the mechanism and the plates involved are a discussion topic, especially at the Colombian South Caribbean Margin, due to the lack of geological information related to the basement. This article integrates petrographic, geochemical analyses and U/Pb dating of basement samples, in addition to the inclusion of published magnetic anomalies maps from the North of Colombia, in order to generate a compositional distribution map of the basement and determine the presence of a magmatic arc under the sediments of the Lower Magdalena Valley (LMV), which supports the existence of a Late Cretaceous active continental margin represented by a magmatic arc, called Magmatic Arc of Magangué. Dating of the arc yield a Late Cretaceous Age (84-74 Myr), and petrographic and geochemical evidence suggests it is comprised of igneous bodies of felsic to intermediate composition, which intrude the LMV continental crust, originated in a subduction setting. The origin of the LMV continental crust seems to be related to the continent-continent collision (consolidation of Pangaea) during the Permian (300 Ma ago), and to the post-Alleganian extension event of Triassic age (232 Ma ago). 2016 artículo científico 0122-5383 https://www.redalyc.org/articulo.oa?id=46550993001 en http://www.redalyc.org/revista.oa?id=465 CT&F Ciencia, Tecnología y Futuro application/pdf ECOPETROL S.A. CT&F Ciencia, Tecnología y Futuro (Colombia) Num.4 Vol.6