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 language | English (US) |
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Pages (from-to) | 255-265 |
Number of pages | 11 |
Journal | Palaeogeography, Palaeoclimatology, Palaeoecology |
Volume | 80 |
Issue number | 3-4 |
DOIs | |
State | Published - Nov 1990 |
All Science Journal Classification (ASJC) codes
- Oceanography
- Ecology, Evolution, Behavior and Systematics
- Earth-Surface Processes
- Palaeontology