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- Title
PETROGRAFÍA Y GEOQUÍMICA DE LAS ROCAS INTRUSIVAS AFLORANTES ENTRE LOS MUNICIPIOS DE MISTRATÓ Y BELÉN DE UMBRÍA (DEPARTAMENTO DE RISARALDA, CORDILLERA OCCIDENTAL COLOMBIANA).
- Authors
Felipe Vallejo Hincapié, Diego; Felipe Salazar Ríos, Andrés; Mary Toro Toro, Luz
- Abstract
The intrusive rocks studied are located between Mistrató and Belén de Umbría towns, Risaralda department, on the eastern flank of the Western Cordillera, at the west of Cauca-Almaguer Faults System. The north of area is dominant by Microgabbros and Gabbros compound of plagioclase (labradorite), ortopiroxene, clinopiroxene ± hornblende. The geochemistry diagrams show low values in potassium, of the tholeitic serie and affinity oceanic. The gabbroic unit has been related with the oceanic terrane of the Western Cordillera. At the south, the outcrops are of acid rocks that go from Quartzdiorite to Granodiorite with higher presence of tonalite. The mineralogy consists of plagioclase (andesine) ± hornblende ± biotite ± alkali feldspar; to the southeast this body is in an intrusive contact with Gabro de Anserma generating a thin contact aureole, and the west presents a wide zone of mylonitic rocks associated with the Mistrató Fault. The Geochemistry results confirm a calco-alkali character, produced in a setting volcanic-arc during the Paleogene.
- Subjects
PETROLOGY; GEOCHEMISTRY; GRANODIORITE; HORNBLENDE; IGNEOUS rocks; TONALITE; PALEOGENE
- Publication
Boletin de Geologia, 2011, Vol 33, Issue 2, p47
- ISSN
0120-0283
- Publication type
Article