| Autor: |
Joseneusa Brilhante Rodrigues, Wagner da Silva Amaral, Carlos Eduardo Ganade de Araujo, Felipe Grandjean da Costa, Antônio Maurílio Vasconcelos |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Geologia USP. Série Científica, Vol 13, Iss 2, Pp 159-174 (2013) |
| ISSN: |
1519-874X |
| DOI: |
10.5327/z1519-874x2013000200009 |
| Popis: |
The Tamboril-Santa Quiteria Complex (TSQC) is one of the largest Neoproterozoic plutonic manifestations in the north Borborema Province (NE Brazil). It represents an anatectic/igneous association characterized by a number of magmatic pulses that occurred in the 650-610 Ma interval. In this paper, we present U-Pb (LA-MC-ICP-MS) zircon ages and Nd isotopes for quartz monzonites and quartz diorites of the southern part of TSQC. The quartz monzonites belong to a hybrid granitoid association, including monzonites, syenites and quartz syenites, all with abundant mafic magmatic enclaves. A quartz monzonite sample yielded a U-Pb zircon age of 634 ± 10 Ma and a TDM age of 2.69 Ga. The quartz diorites are much more homogeneous in composition and yielded a U-Pb zircon age of 618 ± 23 Ma and a TDM age of 2.19 Ga. The presence of coeval mantle-derived magmatism and diatexites (crustal anatexis) post-dating high-pressure metamorphism (ca. 650 Ma), and together with high-temperature metamorphism (ca. 630-610 Ma), suggests that this large magmatic manifestation evolved in a collisional setting, probably related to slab breakoff during the Western Gondwana amalgamation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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