U-Pb (LA-ICPMS) zircon ages and Nd isotopes for granitoids of the Tamboril-Santa Quitéria Complex, Ceará Central Domain: implication for neoproterozoic syncollisional magmatism in north Borborema Province

Authors

  • Felipe Grandjean da Costa CPRM; Serviço Geológico do Brasil
  • Carlos Eduardo Ganade de Araújo CPRM; Serviço Geológico do Brasil
  • Wagner da Silva Amaral Universidade Federal do Ceará; Departamento de Geologia
  • Antonio Maurilio Vasconcelos CPRM; Serviço Geológico do Brasil
  • Joseneusa Brilhante Rodrigues CPRM; Serviço Geológico do Brasil

DOI:

https://doi.org/10.5327/Z1519-874X2013000200009

Keywords:

Borborema Province, Neoproterozoic magmatism, Continental collision

Abstract

The Tamboril-Santa Quitéria 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.

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Published

2013-06-01

Issue

Vol. 13 No. 2 (2013)

Section

Articles

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How to Cite

Costa, F. G. da, Araújo, C. E. G. de, Amaral, W. da S., Vasconcelos, A. M., & Rodrigues, J. B. (2013). U-Pb (LA-ICPMS) zircon ages and Nd isotopes for granitoids of the Tamboril-Santa Quitéria Complex, Ceará Central Domain: implication for neoproterozoic syncollisional magmatism in north Borborema Province . Geologia USP. Série Científica, 13(2), 159-174. https://doi.org/10.5327/Z1519-874X2013000200009