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dc.typeArtigo de periódicopt_BR
dc.titleAge And Origin Of The Neoproterozoic Brauna Kimberlites: Melt Generation Within The Metasomatized Base Of The São Francisco Craton, Brazilpt_BR
dc.contributor.authorDonatti-Filho J.P.pt_BR
dc.contributor.authorTappe S.pt_BR
dc.contributor.authorOliveira E.P.pt_BR
dc.contributor.authorHeaman L.M.pt_BR
unicamp.authorDonatti-Filho, J.P., Institute of Geosciences, University of Campinas - UNICAMP, P.O. Box 6152, 13083-970 Campinas, SP, Brazilpt_BR
unicamp.authorOliveira, E.P., Institute of Geosciences, University of Campinas - UNICAMP, P.O. Box 6152, 13083-970 Campinas, SP, Brazilpt_BR, S., Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, AB, T6G 2E3, Canada, Institut für Mineralogie, Westfälische Wilhelms-Universität, Corrensstrasse 24, 48149 Münster, Germanypt, L.M., Department of Earth and Atmospheric Sciences, University of Alberta, 1-26 Earth Sciences Building, Edmonton, AB, T6G 2E3, Canadapt
dc.description.abstractThe diamondiferous Brauna kimberlite field is situated in the northeast part of the São Francisco craton, Bahia State, Brazil, and ongoing exploration revealed three complex pipe-like bodies and nineteen dykes oriented along a N30W trend. Uranium-Pb perovskite age determinations of hypabyssal kimberlite material yielded a high-precision emplacement age of 642. ±. 6. Ma (2-sigma uncertainty). This age provides the first evidence for Neoproterozoic kimberlite magmatism in Brazil, and the Brauna kimberlites thus represent the oldest known primary source of diamonds in the São Francisco craton.Primary kimberlite mineralogy at Brauna comprises olivine, spinel, ilmenite, phlogopite, perovskite, apatite, as well as late-stage serpentine and carbonate. Furthermore, abundant olivine, Cr-diopside, and pyrope garnet xenocrysts are present. The most common xenoliths are wall-rock granodiorites, mantle eclogites and peridotites. The Brauna kimberlites do not fit into the classic subdivision of kimberlites and orangeites (formerly Group-II kimberlites) based on South African type occurrences. Their geochemical and isotopic signatures, with negative initial εNd values of -5.8 to -8.1 and variably enriched 87Sr/86Sr ratios (0.7045-0.7063), suggest that Brauna kimberlite magmas were derived from a mantle source region that was strongly metasomatized prior to kimberlite magmatism at ~642Ma. In particular, the incompatible element distribution suggests that Brauna kimberlite magmas originate from the metasomatized base of the São Francisco craton, with only minor input from the convecting upper mantle. The Brauna kimberlites mineralogically and geochemically resemble the slightly older "anomalous" mica kimberlites from Guaniamo in Venezuela (712±6Ma). This may suggest that both mica-rich kimberlite occurrences formed from similarly enriched subcratonic mantle lithosphere during Late Neoproterozoic extensional tectonics related to the breakup of the supercontinent Rodinia. © 2012 Elsevier B.V.en
dc.relation.ispartofChemical Geologypt_BR
dc.identifier.citationChemical Geology. , v. 353, n. , p. 19 - 35, 2013.pt_BR
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