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Structural, petrological and geochronological analysis of the lithotypes from the Pien region (Parana State, Brazil) and adjacences The analyses of the entire set of the available data for the Pien area allows the suggestion of a geotectonic scenery related to the evolution of an active continental margin during the collages associated to the Brasiliano Cycle 201 refs., 130 figs., 6 tabs., 2 maps The Sr initial ratios for both granitoids suggest more involvement of the continental crust in the origins of Agudos do Sul granitic Massif. On the other hand, the geochronological data for the Agudos do Sul Massif are in the 590-570 Ma interval showing its younger generation.

The available radiometric data for the Rio Pien mylonitic granitoids show that between 650-595 Ma the generation, deformation and cooling below the isotherm of 250 deg C occurred. K-Ar on biotite extracted from these rocks, gave Neoproterozoic ages. Based in geochemical data, it is proposed that the biotite gneiss and biotite-amphibole-gneiss which occur near the PSZ have a shoshonitic to high-K calc-alkaline features which are characteristic of active continental margins. K-Ar on plagioclase from gabbronorites gave Neoproterozoic ages although Sm-Nd whole rock isochron yielded Paleoproterozoic ages. Considering the identified lithotypes, their geochemical affinity (particularly the Ti, Cr, Ni and REE content) and the geological context observed in the area, a geotectonical model of active continental margin related to subduction SSZ (Supra-Subduction Zone) is proposed. The southern domain is represented by the Amphibolite-Granulite where high grade metamorphism took place at the end of paleoproterozoic time. The northern one is the Rio Pien Granite-Mylonitic Suite composed by calc-alkaline granitoids of Neoproterozoic age. The Pien area presents the major geotectonic domains separated by the Pien Shear Zone (PSZ).

Structural, petrological and geochronological analysis of the lithotypes from the Pien region (Parana State, Brazil) and adjacences Analise estrutural, petrologica e geocronologica dos litotipos da Regiao de Pien (PR) e adjacenciasĮnergy Technology Data Exchange (ETDEWEB)

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