Structural and metamorphic analysis of the Sucuru-Paraíba region: implications for evolution of the Alto Moxotó Terrane, Borborema Province

Authors

  • Lauro Cézar Montefalco de Lira Santos Universidade de Brasília; Instituto de Geociências
  • Edilton José dos Santos Universidade de Brasília; Instituto de Geociências
  • Elton Luiz Dantas Universidade de Brasília; Instituto de Geociências
  • Haroldo Monteiro Lima Universidade Federal de Pernambuco; Departamento de Geologia

DOI:

https://doi.org/10.5327/Z1519-874X2012000300001

Keywords:

Paleoproterozoic, Collisional orogen, Borborema Province, Northeastern Brazil

Abstract

Inserted on the Alto Moxotó Terrane of the Borborema Province, the Sucuru region (Paraíba state, Brazil) includes two dominantly pre-Ediacaran tectono-stratigraphic domains, bounded by an expressive thrust shear zone (Carmo SZ). The first domain has a metaplutonic nature, being formed by granodioritic to migmatitic orthogneisses (Floresta Complex) cut by several intrusive suites. These suites comprise a unit of mafic-ultramafic nature (Malhada Vermelha), a second one mainly of granitic-granodioritic composition (Pedra d'Água) and a last suite whose composition ranges from syenitic to syenogranitic (Serra da Barra). On the second domain predominate migmatitic paragneisses from of the Sertânia Complex. All these units were cut by Cambrian-Ediacaran felsic dykes and A-type granites. Three tectonic events were recognized. The first Dn episode represents a thrusting with tectonic transport to NW-NNW, being important the Sucuru and Carmo shear zones. The Dn+1 episode is a transcurrent event of Ediacaran age, being important in regional context the Coxixola and Congo shear zones. The final progressive late Ediacaran-Cambrian Dn+2 episode, culminated with the emplacement of the Sucuru dyke swarm and the Prata and Serra da Engabelada A-type granites. Petrographic evidences show that the Dn episode reached its metamoprhic peak on the granulitic or eclogitic facies, whose paragenesis was after re-equilibrated to the amphibolite during the Dn+1 event. The Dn+1 episode developed mylonitic corridors on the amphibolite facies with associated migmatization, while the Dn+2, event reached a greenschist facies restrict to influence of the late and post-tectonic intrusives. The occurrence of garnet amphibolites with symplectite texture along the metamorphic path Mn-Mn+1 suggests that the thrust event represented a high pressure metamorphic episode, indicating a probable Paleoproterozoic suture.

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Published

2012-12-01

Issue

Vol. 12 No. 3 (2012)

Section

Articles

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How to Cite

Santos, L. C. M. de L., Santos, E. J. dos, Dantas, E. L., & Lima, H. M. (2012). Structural and metamorphic analysis of the Sucuru-Paraíba region: implications for evolution of the Alto Moxotó Terrane, Borborema Province . Geologia USP. Série Científica, 12(3), 5-20. https://doi.org/10.5327/Z1519-874X2012000300001