Resumo

ARANGO-ESCOBAR, Jansson Estiben; TORO-TORO, Luz Mary; MORENO-SANCHEZ, Mario  e  RUIZ-JIMENEZ, Elvira Cristina. Petrography and tectonic evolution of schists of the Arquía Complex, west of Manizales in the La Manuela sector, roads Palestina and Chinchiná, Colombia. Bol. geol. [online]. 2021, vol.43, n.3, pp.63-86.  Epub 30-Mar-2022. ISSN 0120-0283.  https://doi.org/10.18273/revbol.v43n3-2021003.

The presence of stilpnomelane and chloritoid in schists of the Arquía Complex in the western sector of Manizales, evidences a metamorphism of greenschist facies, low degree in intermediate pressure belts. The association of the metamorphic peak for muscovite quartz schist is chloritoid + muscovite + quartz + plagioclase + stilpnomelane and for actinolitic schist is actinolite + chlorite + epidote/clinozoisite + quartz ± plagioclase. The calculations in pseudosections allowed to determine the following conditions: T= 420±10°C and P= 5.5 to 6 kbar. The geochemical characteristics show that the protolith of the actinolitic schist corresponds to MORB- type basalts and the graphite schist were pelitic rocks associated with an active continental margin. It also presents an integration of this complex with the evolution of western Colombia.

Palavras-chave : Arquía Complex; Schist; Chloritoid; Stilpnomelane.

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