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
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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.About:
This article is published in Precambrian Research.The article was published on 2001-05-01. It has received 423 citations till now. The article focuses on the topics: Craton & Archean.read more
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The lithospheric architecture of Africa: Seismic tomography, mantle petrology, and tectonic evolution
Graham Begg,William L. Griffin,L. M. Natapov,Suzanne Y. O'Reilly,Stephen P. Grand,Craig O'Neill,Jon Hronsky,Y Poudjom Djomani,Christopher J. Swain,T. Deen,Peter Bowden +10 more
TL;DR: In this paper, the authors present a new analysis of the lithospheric architecture of Africa, and its evolution from ca. 3.6 Ga to the present, using thermal/compositional modeling and xenolith/xenocryst data from volcanic rocks.
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A full-plate global reconstruction of the Neoproterozoic
Andrew Merdith,Andrew Merdith,Alan S. Collins,Simon Williams,Sergei Pisarevsky,John Foden,Donnelly B. Archibald,Donnelly B. Archibald,Morgan L. Blades,Brandon L. Alessio,Sheree Armistead,Diana Plavsa,Chris D. Clark,R. Dietmar Müller +13 more
TL;DR: In this article, a full-plate, topological model of the Neoproterozoic that maps the evolution of the tectonic plate configurations during this time is presented.
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.
Correlation of neoproterozoic terranes between the Ribeira Belt, SE Brazil and its African counterpart: comparative tectonic evolution and open questions
Monica Heilbron,Claudio de Morisson Valeriano,Colombo Celso Gaeta Tassinari,Julio Cesar Horta de Almeida,Miguel Tupinambá,Oswaldo Siga Júnior,Rudolph Allard Jonnhanes Trouw +6 more
Abstract: Abstract Four main classes of tectonic entities may be considered for the Ribeira Belt and southwest African counterparts: (1) cratonic fragments older than 1.8 Ga and their passive margin successions, (2) reworked basement terranes with Mesoproterozoic and/or Neoproterozoic deformed cover, (3) magmatic arc associations, (4) terranes with Palaeoproterozoic basement and deformed Neoproterozoic back-arc successions. Based on comparative investigation, a tectonic model of polyphase amalgamation is proposed with c. 790 and 630–610 Ma major episodes of intra-oceanic and cordilleran arc magmatism along both sides of the Adamastor Ocean. Subsequent diachronous collision of the arc terranes and small plates followed at c. 630, 600, 580 and 530 Ma. The tectonic complexity reflects an accretionary evolution from Cryogenian to Cambrian times. The São Francisco–Congo and Angola palaeo-continents did probably not behave as one consolidated block, but rather may have accommodated considerable convergence during the Brasiliano/Pan-African episodes. The final docking of Cabo Frio and Kalahari in the Cambrian was coeval with the arrival of Amazonia on the opposite side, resulting in lateral reactivation and displacement between the previously amalgamated pieces. The transition between the Cambrian and the Ordovician is marked by the extensional collapse of the metamorphic core zones of the orogens.
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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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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A neodymium and strontium isotopic study of the Mesozoic calc‐alkaline granitic batholiths of the Sierra Nevada and Peninsular Ranges, California
TL;DR: In this paper, the authors show that the concentration of Nd correlates well with eNd in the batholith rocks and support the conclusion that juvenile continental crust is derived from mantle reservoirs that are depleted in incompatible elements.
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A History of Continents in the past Three Billion Years
TL;DR: The end-Paleozoic Pangea appears to have contained three continents that had grown in the Precambrian and remained intact until Mesozoic rifting: Ur, formed at 3 Ga and accreted to most of East Antarctica in the middle Proterozoic to form East Gondwana; Arctica, an approximately 2.5-2 Ga continent that contained Archean terranes of the Canadian and Siberian shields and Greenland; and Atlantica formed at 2 Ga of cratons of ~2 Ga age that now occur in West Africa and
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Whole-grain evaporation for 207Pb/206Pb-age-investigations on single zircons using a double-filament thermal ion source
TL;DR: In this article, a technique has been developed and tested to analyse 207Pb/206Pb apparent ages by thermal evaporation of radiogenic lead directly from untreated whole zircon grains (≤0.3 mm).