Abstract

GARCIA-RAMIREZ, Carlos Alberto; CASADIEGOS-AGUDELO, Luisa  and  CASTELLANOS-MELENDEZ, Maria Paula. Petrology and geochemistry of the Silgara Schists in the Silos area, Santander Massif, Colombia. Dyna rev.fac.nac.minas [online]. 2019, vol.86, n.209, pp.271-280. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v86n209.75648.

The Silgará Schists consist primarily of metapelites, metasemipelites, quartz-feldspathic rocks, pure carbonate rocks, and calc-silicate rocks. The REE content and patterns, the Zr/Sc and Th/Sc ratios, and the high contents of Hf and Zr point to a felsic upper crustal source with a high degree of recycling. The Silgará Schists were metamorphosed at peak conditions of 670 - 770° C and 7.8 - 11.3 Kbar as indicated by the paragenesis Bt + Grt + St + Qz + Ky + Pl. The lithology and P-T conditions of the Barrovian type metamorphism of the Silgará Schists of the Silos stripe is very similar to those from the Mutiscua area.

Keywords : petrology; geochemistry; Silgara Schists; Silos; Santander Massif; Colombia.

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