| Autor: |
Nilson Francisquini Botelho, Elton Luiz Dantas, Reinhardt A. Fuck, Federico A. Cuadros |
| Rok vydání: |
2017 |
| Předmět: |
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| Zdroj: |
Precambrian Research. 299:75-100 |
| ISSN: |
0301-9268 |
| Popis: |
Peraluminous granites and tonalites/granodiorites of the Aurumina Suite crop out in the external zone of the Brasilia Fold Belt on the western margin of the Sao Francisco Craton. Rocks of this suite intrude retrograde medium-grade schists and paragneisses of the Ticunzal Formation and display a magmatic muscovite ± biotite ± garnet assemblage and discrete graphite lamellae. The suite is divided into six members (Au1 through Au6), which grade from synkinematic to post-kinematic in character with ages spanning from 2.11 to 2.16 Ga according to zircon U-Pb data. Compositional features of the Aurumina Suite and associated coeval metaluminous mafic to intermediate plutons suggest an origin by source hybridization processes characterized by reaction between metasedimentary rocks and basaltic melts that would have taken place at shallow depths (pressure |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect