Boletín de Geología

Vol. 39 No. 1 (2017): Boletín de Geología
Articles

PETROGRAPHIC, GEOCHEMISTRY AND GEOCHRONOLOGICAL CHARACTERIZATION OF PERMIAN GRANITOIDS ROCKS TO THE WEST OF LA PLATA AND PACARNÍ – HUILA, UPPER MAGDALENA VALLEY – COLOMBIA

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  • Gabriel Rodríguez G.,
  • Gilberto Zapata,
  • María Isabel Arango,
  • José Gilberto Bermúdez
Gabriel Rodríguez G.
Grupo de Estudios Geológicos Especiales. Servicio Geológico Colombiano (SGC), Medellín, Colombia.
Gilberto Zapata
Grupo de Estudios Geológicos Especiales. Servicio Geológico Colombiano (SGC), Medellín, Colombia.
María Isabel Arango
Grupo de Estudios Geológicos Especiales. Servicio Geológico Colombiano (SGC), Medellín, Colombia.
José Gilberto Bermúdez
Grupo de Estudios Geológicos Especiales. Servicio Geológico Colombiano (SGC), Medellín, Colombia.
DOI: https://doi.org/10.18273/revbol.v39n1-2017002

Published 2017-02-24

Keywords

  • Permian rocks,
  • geochemistry,
  • geochronology

How to Cite

Rodríguez G., G., Zapata, G., Arango, M. I., & Bermúdez, J. G. (2017). PETROGRAPHIC, GEOCHEMISTRY AND GEOCHRONOLOGICAL CHARACTERIZATION OF PERMIAN GRANITOIDS ROCKS TO THE WEST OF LA PLATA AND PACARNÍ – HUILA, UPPER MAGDALENA VALLEY – COLOMBIA. Boletín De Geología, 39(1), 41–68. https://doi.org/10.18273/revbol.v39n1-2017002
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Abstract

La Plata Granite is a granitic series with a heterogeneous composition that is outcropping at the eastern flank of the Central Cordillera of Colombia in the Upper Magdalena Valley area, between the Cauca and Huila departments. It is composed of monzogranites, syenogranites, granodiorites and quartz monzonites. At its edges, the unit includes migmatites and granitoids rocks with folded, stromaticand nebulitic structures. These migmatitic rocks are composed of quartz feldespatic granofels representing the leucosome, and quartz feldespatic granofels with hornblende and biotite corresponding to melanosome. Both granitic and migmatitic rocks have a high K rich calc-alkaline affinity, with SiO2 content ranging from 58,92% (migmatites) and 77,39% (sienogranite). These two groups of rocks exhibit correlation in Harker diagrams and indiscriminately placed between metaluminous and peraluminous series. Furthermore, in the multi-element diagrams, there is a difference between the granitic and migmatitic rocks signatures, showing parallelism between them, suggesting similar origins associated with a volcanic arc setting given the low contents of Nb, Ti and P for both groups of rocks. LA-ICP-MS U-Pb geochronology analysis in zircons obtained from seven (7) rocks yield similar crystallization ages for granites and migmatites; with ages of 268,3±2,0 Ma, 273,2±4,1 and 277,9±2,1 Ma for migmatitic rocks and 269,0±3,0 Ma, 270,0±2,7 Ma, 272,0±6,8 Ma and 274,8±2,3 Ma for the granitic rocks. Both groups point to inherited ages from the Permian to the Paleoproterozoic, which suggest the contribution of the continental crust blocks that appear to the east of the Permian rocks described in the present study.

 

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