EGU22-9038, updated on 09 Jan 2023
EGU General Assembly 2022
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Quaternary magmatism above a slab tear, Northern Andes of Colombia

Camilo Conde-Carvajal1, Andreas Kammer1, Michael Avila-Paez1, Sofia Cubillos1, Alejandro Piraquive2, and Albrecht von Quadt3
Camilo Conde-Carvajal et al.
  • 1Group of Applied Structural Geology and Tectonics. National University of Colombia, Bogotá. Department of Geosciences
  • 2Grupo De Asuntos Nucleares, Dirección De Asuntos Nucleares, Servicio Geológico Colombiano, Bogotá, Colombia
  • 3Department of Earth Sciences, Institute of Geochemistry and Petrology, Eth Zentrum, Zürich, Switzerland

The north Andean block evidences by its shallow to intermediate seismicity a juxtaposition of a southern, relatively steeply dipping slab segment with a correlating volcanic arc and a northern flat slab domain, where a margin-parallel volcanic arc became extinct since the Late Miocene. The clear-cut offset of the seismic pattern suggests the presence of a slab tear, which has its correlative morphological expression by a distinct lineament in the Cauca Valley and separates, within the Eastern Cordillera of Colombia, a southern narrow antiformal cordilleran tract from a northern composite belt with an axial depression that constitutes the High Plain of Bogotá. Faults are consistently blind and associated with tight, basement-cored folds with inverted limbs at the mountain front and distinct domes separated by marginal synclines. These structures belong to a young deformation phase as they were superposed on older cylindrical fold trains. Their ductile deformation style may be associated with a thermal anomaly as evidenced by abnormally high Ro data. In order to assess the age of this folding we extracted zircons from a rhyolitic dike that straddles a marginal syncline of a major dome. U-Pb age data indicate a recycling of these crystals from a Neoproterozoic volcanoclastic sequence that composes the basement of this marginal part of the Cordillera. Euhedral overgrowths yield, however, Quaternary ages that we tentatively associate to the advance of the outer bend of the flat slab to its present position.

How to cite: Conde-Carvajal, C., Kammer, A., Avila-Paez, M., Cubillos, S., Piraquive, A., and von Quadt, A.: Quaternary magmatism above a slab tear, Northern Andes of Colombia, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-9038,, 2022.


Display file

Comments on the display

to access the discussion