Produção Nacional
The Pernambuco-Alagoas Massif, Northeast Brazil
1982; Sociedade Brasileira de Geologia; Volume: 12; Linguagem: Inglês
10.5327/rbg.v12i1-2-3.266
ISSN2317-4889
AutoresBenjamim Bley de Brito Neves, Alcídes N. Sial, H.M Rand, Virginia Manso,
Tópico(s)Geological formations and processes
ResumoThe Pernambuco-Alagoas median massif which runs E-W in the states of Pernambuco and Alagoas, Northeast Brazil, constitutes a large segment of Archean to Early Proterozoic rocks, surrounded by younger fold systems of Middle to Late Proterozoic age. Its litho-structural context is rather complex, comprising several gneiss-migmatitic suites associated with mafic to ultramafic rocks, and large gneiss-granitic batholiths. Granitic to syenitic stocks of Brasiliano age pierced locally the ancient rocks of the massif. Apparently, the strucrural trends of the Sao Francisco craton, to the south, continue pervasively in this median massif. The schistosity of the surrounding fold systems typically verges onto this unit. A late phase of local deformation is represented by granitic masses which overthrust the southern and northern borders and partially masked the original limits of the massif. Geophysical surveys helped to precise its limits. lmportant gravimetric and magnetometric anomalies shed some light on the geodynamic evolution of the massif plus its surrounding systems.
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