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metadata.dc.type: | Artigo de Periódico |
Title: | Isotopic signatures of paleoproterozoic granitoids of the gavião block and implications for the evolution of the São Francisco Craton, Bahia, Brazil |
Other Titles: | Revista Brasileira de Geociências |
Authors: | Leal, Luiz Rogerio Bastos Teixeira, Wilson Cunha, Jose Carlos Leal, Angela Beatriz de Menezes Macambira, Moacir José Buenano Rosa, Maria de Lourdes da Silva |
metadata.dc.creator: | Leal, Luiz Rogerio Bastos Teixeira, Wilson Cunha, Jose Carlos Leal, Angela Beatriz de Menezes Macambira, Moacir José Buenano Rosa, Maria de Lourdes da Silva |
Abstract: | Intense granitic plutonism of peraluminous and metaluminous calc-alkaline affinity took place in the northern sector of the São Francisco Craton, during the Paleoproterozoic. Rb-Sr and 207Pb/206Pb(zircon) radiometric data for the granitoids yield crystallization ages at ca. 2.0 Ga. The calculated 87Sr/86Sr initial ratios (up to 0.727), TDM model ages (between 2.6 and 3.5 Ga) and the range in the eNd(t) values (-5.8 to -13.4) are all compatible with participation of variable proportions of Archean crust material in the magma genesis of such plutons. Technically, these granites originated due to the Transamazonian collisional orogeny, which developed within large terranes of the Craton along the edge of the Archean Gavião Block. |
Keywords: | Isotope geochemistry. Geochronology. Granites. Crustal evolution |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/2572 |
Issue Date: | 2000 |
Appears in Collections: | Artigo Publicado em Periódico (IGEO) |
Files in This Item:
File | Description | Size | Format | |
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10577-35525-1-PB.pdf | 462,65 kB | Adobe PDF | View/Open |
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