Journal ArticleDOI
U Pb and Sm Nd geochronologic studies of the eastern Borborema Province, Northeastern Brazil: initial conclusions
W. R. Van Schmus,B.B. de Brito Neves,Peter Christian Hackspacher,Marly Babinski,Marly Babinski +4 more
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TLDR
The Borborema Province of NE Brazil comprises the central part of a wide Pan-African-Brasiliano orogenetic belt that formed as a consequence of late Neoproterozoic convergence and collision of the Sao Luis-West Africa craton and the Sao Francisco-Congo-Kasai cratons as mentioned in this paper.About:
This article is published in Journal of South American Earth Sciences.The article was published on 1995-07-01. It has received 294 citations till now. The article focuses on the topics: Proterozoic & Craton.read more
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The origin and evolution of the South American Platform
TL;DR: The South American Platform is defined as the stable continental portion of the South American plate not affected by the Phanerozoic - Caribbean and Andean orogenic zones as mentioned in this paper.
Journal ArticleDOI
New U–Pb and Sm–Nd data from north-central Cameroon and its bearing on the pre-Pan African history of central Africa
TL;DR: In this paper, U-Pb analyses of zircons and Sm-Nd analyses of minerals and whole rock for samples from north-central Cameroon show a long and complex crustal evolution beginning in the late Archean and extending to the late Neoproterozoic.
Journal ArticleDOI
Geodynamic evolution of the Pan-African belt in central Africa with special reference to Cameroon
TL;DR: In this paper, a model of continent-continent collision that involved the Congo craton and the north-central Cameroon active margin showing Archean to Paleoproterozoic inheritances was proposed.
Journal ArticleDOI
Proterozoic links between the Borborema Province, NE Brazil, and the Central African Fold Belt
W. R. Van Schmus,Elson P. Oliveira,A.F. da Silva Filho,S.F. Toteu,J. Penaye,Ignez de Pinho Guimarães +5 more
TL;DR: The Transverse domain of Brazil is a collage of Palaeoproterozoic crustal blocks, the 1.0 Ga Cariris Velhos orogen (CVO), and Brasi- liano granites as discussed by the authors.
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Neoproterozoic (∼600 Ma) aggregation of Western Gondwana: a tentative scenario
TL;DR: Gondwana resulted from accretion of fragments of the Rodinia supercontinent as mentioned in this paper, with the orogeny closing the old, long-lived Pan-African-Brasiliano tectonic cycle (1000-900 to 600 Ma).
References
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Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology
R.H. Steiger,E. Jäger +1 more
TL;DR: The IUGS Subcommission on Geochronology (FOOTNOTE 4) as discussed by the authors recommended the adoption of a standard set of decay constants and isotopic abundances in isotope geology.
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Approximation of terrestrial lead isotope evolution by a two-stage model
J.S. Stacey,Jan Kramers +1 more
TL;DR: In this paper, a two-stage model for terrestrial lead isotope evolution is proposed, which permits the age of the earth to be that of the meteorite system and also yields good model ages for samples of all ages.
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A low-contamination method for hydrothermal decomposition of zircon and extraction of U and Pb for isotopic age determinations
TL;DR: In this paper, Krogh et al. developed a simple procedure for the decomposition of zircon and the extraction of U and Pb for isotopic age determinations.
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Improved accuracy of U-Pb zircon ages by the creation of more concordant systems using an air abrasion technique
TL;DR: Abrasion combined with an improved paramagnetic separation technique eliminates 90 to 100 percent of discordance so that ages of unprecedented accuracy (± 1 to 3 my) can be achieved for virtually all 2700 my old zircon populations from plutonic or volcanic rocks as mentioned in this paper.
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Did the breakout of laurentia turn gondwanaland inside-out?
TL;DR: Comparative geology suggests that the continents adjacent to northern, western, southern, and eastern Laurentia in the Late Proterozoic were Siberia, Australia-Antarctica, southern Africa, and Amazonia-Baltica, respectively.