Paleomagnetic evidence for the evolution of Meso- to Neo-proterozoic glaciogenic rocks in central-eastern Brazil

Manoel S. D'Agrella-Filho, Igor G. Pacca, Wilson Teixeira, Tullis C. Onstott, Paul R. Renne

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Paleomagnetic studies on basic dikes in the eastern São Francisco Craton which have isotopic ages of 1.0-1.1 Ga, define an apparent polar wander path for South America over this time interval. The data indicate that the São Francisco Craton was at paleolatitudes between 40° and 65° at the time of emplacement of these dikes. Neo-Proterozoic sedimentary glaciogenic rocks, the Macaúbas Group, Bebedouro Formation, Ibiá Formation and Carandai Formation, crop out in central-eastern Brazil. An age of about 1.0 Ga has been proposed for these glacial deposits. Paleogeographical reconstructions of South America show a continental movement coherent with paleoenvironmental models proposed for the Macaúbas Group and suggest that the glacial period may have occurred between 1.01 and 1.08 Ga.

Original languageEnglish (US)
Pages (from-to)255-265
Number of pages11
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume80
Issue number3-4
DOIs
StatePublished - Nov 1990

All Science Journal Classification (ASJC) codes

  • Earth-Surface Processes
  • Ecology, Evolution, Behavior and Systematics
  • Oceanography
  • Palaeontology

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