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Cordilleran Section - 108th Annual Meeting (29–31 March 2012)

Paper No. 1
Presentation Time: 08:30-18:30

GEOCHEMICAL COMPOSITION AND ORIGIN OF METABASITE ROCKS FROM THE ARQUIA COMPLEX (CENTRAL COLOMBIA)


RUIZ Sr, Elvira Cristina1, TORO, Luz Mary2, GARCIA CASCO, Antonio3, BLANCO-QUINTERO, Idael3, MORENO, Mario1, GÓMEZ, Arley1 and VINASCO, Cesar4, (1)Caldas, Universidad de Caldas, Calle 65 No.26-10, Carrera 8 No. 45C-01 casa D-24, Manizales, 0057, Colombia, (2)Geology Dept, Caldas University, Calle 65 #26-10, Manizales, 57, Colombia, (3)Department of Mineralogy and Petrology, Facultad de Ciencias - Universidad de Granada, Instituto Andaluz de Ciencias de la Tierra, Avenida Fuente Nueva 18002, Granada, 00000, Spain, (4)Geociencias, Universidad Nacional de Colombia - Medellin, Medellin, 000004, Colombia, elvira.ruiz@ucaldas.edu.co

The Arquía complex (Central Colombia) represents an accretionary complex containing rock bodies of different origin and composition including (meta)sediments, (meta)volcanics and (meta)ultramafites. According to the metamorphic grade, metabasites can be grouped in greenschist and epidote-amphibolites. Their major element composition indicates basaltic compositions of tholeiitic affinity with SiO2=45.86-50.48 wt%, FeO+MgO=16.7- 23.4 wt% and K2O+Na2O=1.3-4.6wt%. The REE patterns are characterized by slightly depleted LREE, with (La/Yb)n <0.72, and no Eu anomaly (Eu/Eu*= 0.90-1.05). The trace element composition indicates enrichment in LILE (principally in Cs, Ba, and Pb). These features, and the Th/Yb and Ta/Yb ratios (0.03-0.26 and 0.02-0.26 respectively), indicate a MORB composition modified by infiltration of LILE-bearing fluids during metamorphism

Session No. 22--Booth# 1

Geochemistry and Petrology of Igneous Rocks (Posters)
Friday, 30 March 2012: 08:30-18:30
Juarez 1 and 2 (Hotel Misión Juriquilla)
Geological Society of America Abstracts with Programs. Vol. 44, No. 3, p.57
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