Zircon Pb-Pb Geochronology of the Caruaru Area, Northeastern Brazil: Temporal Constraints on the Proterozoic Evolution of Borborema Province
| Autor: | J. M. Rangel da Silva, Sérgio P. Neves, Gorki Mariano, Silvana C. Melo, Cândido Augusto Veloso Moura |
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| Rok vydání: | 2004 |
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| Zdroj: | International Geology Review. 46:52-63 |
| ISSN: | 1938-2839 0020-6814 |
| DOI: | 10.2747/0020-6814.46.1.52 |
| Popis: | The Caruaru-Arcoverde batholith, with an outcrop area of ~2000 km2, is one of the largest Brasiliano plutons in Borborema Province, northeastern Brazil. The batholith intrudes orthogneisses and supracrustal rocks characterized by flat-lying foliation, and is bounded in the south by a synmagmatic, transcurrent shear zone, interpreted by some as a terrane boundary. In order to constrain the emplacement age of the batholith and the Proterozoic history of the eastern portion of Borborema Province, single zircon grains from seven samples from the Caruaru-Arcoverde batholith and nearby country rocks were analyzed by the Pb-evaporation technique. Zircons from orthogneisses immediately north of the Caruaru-Arcoverde batholith yielded ages of 2098 ± 15 Ma and 2072 ± 3 Ma. One zircon sample from an orthogneiss located south of the batholith gave an age of 2075 ± 7 Ma. Combined with existing zircon U-Pb ages in orthogneisses and Nd model ages of plutons and country rocks in eastern Borborema Province, these data ind... |
| Databáze: | OpenAIRE |
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