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 Ecopetrol S.A.
  • Liliana-Andrea Páez-Acuña Universidad Industrial de Santander https://orcid.org/0000-0001-6020-6527
  • Daniel Rincón-Martínez Ecopetrol S.A. https://orcid.org/0000-0002-5684-2130
  • Javier-Alfonso Tamara-Guevara Royal Holloway. University of London, England.
  • Pedro-David Gomez-Gutiérrez Ecopetrol S.A.
  • Eduardo López-Ramos Ecopetrol S.A.
  • Sandra-Milena Restrepo-Acevedo Ecopetrol S.A.
  • Luis-Carlos Mantilla-Figueroa Universidad Industrial de Santander
  • Victor Valencia Washington State University, School of Earth and Enviromental Sciences
Keywords: Magmatic Arc, U-Pb geochronology, subduction, Caribbean, South America.

Abstract

The onset of subduction in the Caribbean Plate under the South American Plate allowed the development 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 in tegrates 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 intrudes 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).

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How to Cite
Silva-Arias, A., Páez-Acuña, L.-A., Rincón-Martínez, D., Tamara-Guevara, J.-A., Gomez-Gutiérrez, P.-D., López-Ramos, E., Restrepo-Acevedo, S.-M., Mantilla-Figueroa, L.-C., & Valencia, V. (2016). 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. CT&F - Ciencia, Tecnología Y Futuro, 6(4), 5-36. https://doi.org/10.29047/01225383.01

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Published
2016-11-30
Section
Scientific and Technological Research Articles