Estilos de deformações glaciotectônicas no subgrupo Itararé, neopaleozóico da Bacia do Paraná

Abstract

The work analyze glaciotectonic structures present in sediments of the Itararé Subgroup (Neopaleozoic, Paraná Basin), through the study of the glaciotectonic deformation models in the subglacial and proglacial environment deposits, in the states of São Paulo and Paraná. A comparative analysis were developed involving glaciotectonic structures in Recent sediments (Iceland) and deformations related to gravitational mass flows (Boituva). To characterize the deformations, interpret its genesis and establish criteria to differentiate them, stratigraphical, sedimentological and structural analyses were used. The main results of the research are: confirmation of the existence and characterization of neopalaleozoic glaciotectonic structures generated in subglacial and proglacial environments; pre-Pleistocene glaciotectonic structures classification; contributions to the reological models of the "subglaciotectonic" structures, in particular to the Slidee-Stick Cycle Model; interpretations of the genesis os the Boituva, Capivari, Jumirim and Witmarsum deformations; identification of neopaleozoic push moraines; new data about the boulder pavements of Capivari and Jumitim; description of brittle glaciotectonic structures occurrences in iceland, wich where development as consequence of the presence of frozen sediments; structural analyses of the deformations found in Boituva, with the characterization of a landslide process; analyses on the use of structural methods for discrimination between glacial tectonic deformations and gravitational mass flows.