Textural path of metamorphic rocks from central portion of the eastern side of Sierra de Comechingones, Córdoba, Argentina

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A.B. Guereschi
R.D. Martino

Abstract

The metamorphic basement on the eastern side of Sierra de Comechingones (Córdoba), consist mainly of Bt-Grt gneisses, stromatic migmatites and diatexites. Considering textural paths followed by metamorphic rocks a clockwise loop is established. It has been recognized a medium-grade metamorphic event M1-D1 preserved like relictic rocks, mineral paragenesis (Grt + Bt St Rt) and structures (S1 foliation). After overcome St + Bt stability and higher pressure conditions of Grt + Rt, these rocks reached metamorphic peak conditions M2-D2 producing high-grade paragenesis, partial melting of metapelitic rocks (stromatic migmatites with Sil + Kfs) and developing a pervasive metamorphic foliation S2. The dominant pelitic assemblage found in gneisses and migmatites is Qtz + Pl + Bt + Grt + Sil + Kfs. After the metamorphic peak, a dynamic event M3-D3 with high temperature shear deformation is produced. Later, a decompression + cooling event (M4) took place, producing plagioclase coronas around garnet in all rocks and a second anatexis with Crd + Kfs diatexites. A cooling + hydration event (M5) followed decompression is evidenced by biotite coronas around garnet. The path was closed during the M6 hydration event developed at lower temperatures producing mineral alterations. This high-grade metamorphic basement would form the internal zone of a Late Precambrian-Early Cambrian collision of Pampia terrane with the western Gondwana margin.

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How to Cite
Guereschi, A. ., & Martino, R. (2003). Textural path of metamorphic rocks from central portion of the eastern side of Sierra de Comechingones, Córdoba, Argentina. Revista De La Asociación Geológica Argentina, 58(1), 61-77. Retrieved from https://revista.geologica.org.ar/raga/article/view/1478
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