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2015 GSA Annual Meeting in Baltimore, Maryland, USA (1-4 November 2015)

Paper No. 47-26
Presentation Time: 9:00 AM-5:30 PM

THERMOCHRONOLOGIC AND GEOMORPHIC CONSTRAINS OF CENOZOIC UPLIFT IN THE NORTHWESTERN CENTRAL CORDILLERA-COLOMBIA


NORIEGA, Santiago, Escuela de Geociencias y Medio Ambiente, Universidad Nacional de Colombia, Carrera 80 No. 65-223, Medellin, 0001, Colombia, RESTREPO-MORENO, Sergio A., Departamento de Geociencias y Medio Ambiente, Universidad Nacional de Colombia Facultad de Minas, Carrera 80 No 65-223, Nucleo Robledo, Medelln, 000000, Colombia, VINASCO, Cesar, Geociencias, Universidad Nacional de Colombia - Medellin, Medellin, 000004, Colombia, FOSTER, David A., Department of Geological Sciences, University of Florida, 241 Williamson Hall, Gainesville, FL 32611, MIN, Kyoungwon, Department of Geological Sciences, University of Florida, Gainesville, FL 32611, BERNET, Matthias, Institut de Science de la Terre, Université Joseph Fourier, OSUG C - BP 53 - 1381 Rue de la Piscine, Grenoble Cedex, 38041, MARIN-CERON, Maria Isabel, Departamento de Geología, Universidad EAFIT, Carrera 49 N° 7 Sur - 50, Medellín, 00001, Colombia, KAMENOV, George D., Department of Geological Sciences, University of Florida, 241 Williamson Hall, PO Box 112120, Gainesville, FL 32611 and BOTERO, Manuela, Departamento de Geociencias y Medio Ambiente, Universidad Nacional de Colombia Facultad de Minas, Carrera 80 No 65-223, Nucleo Robledo, Medellin, 0000, Colombia, santiageo@gmail.com

The complex convergence regime between Nazca and South American plates partitions deformation over smaller litho-tectonic blocks. In Colombia’s Andes, this geodynamic condition is influenced by tropical humid climate that contributes to developing N-S trending mountain belts and linear valleys that configure key morphotectonic features. However, the interplay between faulting-uplift-exhumation and erosion-climate-drainage development- landscape evolution remains poorly understood.

The northwestern portion of the Central Cordillera (CC) possesses two contrasting morphotectonic domains: The elevated erosional surface Antioqueño Plateau (AP) and the deeply incised Cauca river canyon (CRC). These are separated by the Espiritu Santo Fault (ESF) and others structures related with Romeral Fault System (RFS). We evaluate relationships between tectonic and geomorphic process by reconstructing the crust’s tectono-thermal history in various litho-tectonic blocks related to the ESF and RFS and by documenting modern morphotectonic features and process though digital terrain analyses/parameterization (DTA/P).

Zircon U-Pb ages show metamorphism of the western block at ~230 Ma while the eastern block shows crystallization ages c.a. 70 Ma. Lack of Cretaceous signals in the western block suggest a Meso-Cenozoic displacement along ESF. Helium ages (Zr/Ap) document two different periods of fast cooling/exhumation of both blocks at ca. 51-56 Ma and 40-42 Ma, concordant with strike slip behavior of ESF. ZFT of detrital samples on litho-tectonic blocks related with RFS show three peaks of rapid cooling indicating exhumation/uplift in Cretaceous (~90-128 Ma), Paleocene (~50-54 Ma) and Eocene (35-40 Ma) times suggesting and important Cretaceous deformational event of RFS and EFS. Drainage network and basin morphology analysis by DTA/P show a clear contrast in the long-term geomorphic evolution of both blocks, suggesting capture of drainages located in the AP due to upward progression of the erosion wave from the CRC, and indicating controls of ESF and transient states of various catchments through Late Cenozoic times. Integrated proxies suggest clear relationships and feedbacks between tectonic and geomorphic process, mainly associated with the Cenozoic deformational history of ESF.

Session No. 47--Booth# 448

Tectonics/Tectonophysics (Posters)
Sunday, 1 November 2015: 9:00 AM-5:30 PM
Exhibit Hall (Baltimore Convention Center)
Geological Society of America Abstracts with Programs. Vol. 47, No. 7, p.157
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