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Deformação rúptil em rochas do magmatismo Penatecaua no domo de Monte Alegre (PA)

2012; Sociedade Brasileira de Geologia; Volume: 42; Issue: 4 Linguagem: Inglês

10.5327/z0375-75362012000400009

2177-4382

Isabella Françoso Rebutini Figueira, Eduardo Salamuni, Fernando Mancini,

Fish biology, ecology, and behavior

Monte Alegre dome, which stands out amid the plains of the Amazon River, is a topographic high on the left bank of the river, about 10 km northwest of the city of the same name, in Pará. From its discovery, many hypotheses have been for the genesis of the dome, however only in 1975 Montalvão and Oliveira associated geometry with tholeitic intrusion that have shaped as braquianticlinal structure, with ellipsoid-shaped 30 km long and 20 km wide. Through morphostructural researchers of the dome, of the rock layers tilted and, in particular, systems of fractures in intrusive rocks generated by magmatism Penatecaua was possible to verify that the current braquianticlinal structure of the dome, originated as a result of deformation at least two phases of deformation (F1 and F2) Juro-Cretaceous, which generated at least two systems of locally ductile and brittle shearing, when the rheology is ripe. Correlated these stages of deformation, by analyzing the paleostress with regional tectonic regimes, such as diastrophic Juruá, confirming that it had a decisive influence on the finite deformation of the dome.