| Título: | Datos preliminares sobre el metamorfismo de la Sierra de Pie dePalo, Sierras Pampeanas Occidentales (Argentina) |
| Autores: | Baldo, Edgardo G. ; Casquet, César ; Galindo Francisco, Mª del Carmen |
| Tipo de documento: | texto impreso |
| Editorial: | Sociedad Geológica de España, 1998 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Petrología , Tipo = Artículo |
| Resumen: |
The Sierra de Pie de Palo belongs to the Western Sierras Pampeanas. Although still poorly known in detail, the sierra consists of a relatively autochthonous sequence of shelf sediments metamorphosed to low grade (the Caucete Group) and an allochthonous complex of polymetamorphic medium-to-high grade igneous and sedimentary rocks thrust towards the west and northwest. Mylonitization is widespread. Radiometric dating by different methods (U-Pb, 4°Ar/39Ar and K-Ar) suggests that at least two tectonothermal events are present in the allochthonous: Grenville (ca. 1 Ga) and Famatinian (480-312Ma). Metamorphism has been studied in a Ca-rich pelite with a complex mineralogical composition (Qtz, Ms, Pg, Bt, Grt, Ky, Hbl, St, Rt, 111, PI, Ep). This rock is a mylonite. Three metamorphic stages are recognized: the first two correspond to a prograde M, metamorphism under relatively high P/T conditions (peak at 13kb and about 600ºC). The second is related to mylonitization (Mm 1) with T - 575ºC and P Grenville orogeny and Mmyl to the Famatinian orogeny. |
| En línea: | https://eprints.ucm.es/id/eprint/11462/1/Baldo_et_al_geogaceta_1998.pdf |
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