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BIBTEX RIS

TECTÔNICA RÚPTIL DA REGIÃO ENTRE PILAR DO SUL E VOTORANTIM, SP

1998; Sociedade Brasileira de Geologia; Volume: 28; Issue: 4 Linguagem: Inglês

10.25249/0375-7536.1998485494

ISSN

2177-4382

Autores

PAULO CÉSAR FERNANDES DA SILVA,

Tópico(s)

Geography and Environmental Studies

Resumo

PILAR DO SUL AND VOTORANTIM, SP.The western part of the Proterozoic São Roque Group, between the cities of Pilar do Sul and Votorantim (southeastern São Paulo State, Brazil), was mapped on a scale of 1:50.000.The study has focused upon structural analysis with main emphasis on brittle features.The following lithologic types outcrop in the study area: metassediments of the São Roque Group; metassediments correlated to Açungui and Serra do Itaberaba groups; varied granitic rocks (mainly correlated to the São Francisco, Sorocaba, Piedade and Pilar do Sul massifs); sediments of the Itararé Subgroup; Recent alluvionar deposits and minor ocurrence of alkaline and metabasic rocks.Transcurrent shear zones are the main regional structural features and demarcate four structural domains.Within the context of brittle deformation, data sets for fault slip and joints reveal six well-defmed superposed stress fïelds at both local and regional scales, each corresponding to a specific time-interval of a distinct tectonic event.Following a first event of N-S compression, the five others -successively, NNW-SSE extension, NE-SW compression, NW-SE compression, WNW-ESE extension and E-W compression -are remarkably compatible with the currently accepted model for Cenozoic tectonic evolution of the eastern part of the State of São Paulo.

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