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Artigo Produção Nacional Revisado por pares
BIBTEX RIS

Late Cretaceous alkaline complexes, southeastern Brazil: Paleomagnetism and geochronology

1995; Elsevier BV; Volume: 134; Issue: 3-4 Linguagem: Inglês

10.1016/0012-821x(95)00135-y

ISSN

1385-013X

Autores

Célia Regina Montes, I. G. Pacca, Adolpho José Melfi, Koji Kawashita,

Tópico(s)

Paleontology and Stratigraphy of Fossils

Resumo

Late Cretaceous alkaline rocks from Poços de Caldas, Itatiaia, Passa Quatro and São Sebastião Island were studied with the main purpose of improving the South American apparent polar wander path (APWP). RbSr age determinations for Passa Quatro and alkaline stocks from São Sebastião Island are around 70 and 81 Ma respectively. The magnetic carriers in the rocks studied were maghemite and highly oxidized titanomagnetites. The paleomagnetic poles obtained in this work are 320.1°E, 83.2°S (N = 47, A95 = 2.7°, KSC = 2609.8) for Poços de Caldas, 360.0°E, 79.5°S (N = 18, A95 = 5.7°, KSC = 607.4) for Passa Quatro and Itatiaia, and 331.9°E, 79.4°S (N = 18, A95 = 4.9°, KSC = 862.4) for São Sebastião Island (the ISLAND set).

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