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 Volume 1 Chapter 8

Chapter 8

The Anacona Terrane: A Small Early Paleozoic Peri–Gondwanan Terrane in the Cauca–Romeral Fault System

Jorge Julián RESTREPO, Uwe MARTENS and Wilmer E. GIRALDO–RAMÍREZ

https://doi.org/10.32685/pub.esp.35.2019.08


Citation is suggested as: 

Restrepo, J.J., Martens, U. & Giraldo–Ramírez, W.E. 2019. The Anacona Terrane: A small early Paleozoic peri–Gondwanan terrane in the Cauca–Romeral Fault System. In: Gómez, J. & Mateus–Zabala, D. (editors), The Geology of Colombia, Volume 1 Proterozoic – Paleozoic. Servicio Geológico Colombiano, Publicaciones Geológicas Especiales 35, p. 217–251. Bogotá. https://doi.org/10.32685/pub.esp.35.2019.08


Abstract


The Anacona Terrane is a small terrane south of Medellín that underwent a geologic history dissimilar to that of the adjacent Tahamí Terrane to the east and the Quebradagrande (Ebéjico) Terrane to the west. The metamorphic basement of the Anacona Terrane is relatively old, comprising amphibolites and metasedimentary rocks, with probable late Neoproterozoic depositional ages, and granitic orthogneisses, with Ordovician magmatic ages. The age of the last metamorphic event to affect the Anacona Terrane is constrained to the Devonian or earliest Carboniferous, while Triassic metamorphism, which is widespread in the Tahamí Terrane, has not been documented in the Anacona Terrane, indicating that the terranes were amalgamated during or after the Triassic. Correlatives of the terrane are the Acatlán Complex in southern México and the Marañón Complex and coastal islands in Perú; we surmise that the Anacona Terrane may have originated in a southerly position and migrated northwards, similar to the motion of the Caribbean Plate relative to the South American margin.

Keywords:   Anacona, tectonostratigraphic terranes, Colombian Andes, Proterozoic sedimentation, garnet amphibolites.