Two-stage terrane assembly in Western Gondwana: Insights from structural geology and geophysical data of central Borborema Province, NE Brazil

Lauro Cézar M.de Lira Santos, Elton L. Dantas, Roberta M. Vidotti, Peter A. Cawood, Edilton J. dos Santos, Reinhadt A. Fuck, Haroldo M. Lima

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Combined geophysical and structural data from the Transversal Subprovince of the Borborema Province (NE Brazil) highlight the internal structure of, and interrelationships between, the constituent terranes. Radiometric and magnetic maps show distinctive signatures for the Archean-Paleoproterozoic Alto Moxotó and Meso-to Neoproterozoic Alto Pajeú and Pernambuco-Alagoas terranes. Mapped radiometric and first and second order magnetic lineaments, associated with Euler deconvolution, enable correlation between geophysical data and major structures. In addition to early related deformation of the Alto Moxotó Terrane, combined analysis of late transposition foliations, lineations and kinematic criteria reveal a complex structural evolution marked by two distinct assembly stages. The first phase is characterized by thrust tectonics with top-to-the-south vergence, resulting in the juxtaposition of the allochtonous Alto Pajeú Terrane with the structurally underlying Alto Moxotó Terrane. The terrane boundary is delineated by the Serra de Jabitacá Shear Zone, which is associated with low dipping collisional granitic sheets and ca. 1.0 Ga mafic-ultramafic rocks interpreted as obtudcted ophiolite remnants. Later strike-slip movements strongly folded and obliterated thrust-related markers, and the continental scale E-W Pernambuco Lineament is interpreted as the result of lateral assembly between the composite Alto Pajeú-Alto Moxotó terranes and the Pernambuco-Alagoas Terrane during the metamorphic peak of the Brasiliano orogeny. Evolution of the Borborema Province reflects accretionary processes during the assembly of Western Gondwana.

Original languageEnglish
Pages (from-to)167-184
Number of pages18
JournalJournal of Structural Geology
Volume103
DOIs
Publication statusPublished - 1 Oct 2017

Keywords

  • Accretion tectonics
  • Borborema Province
  • Polycyclic deformation
  • Western Gondwana

Cite this

Santos, Lauro Cézar M.de Lira ; Dantas, Elton L. ; Vidotti, Roberta M. ; Cawood, Peter A. ; dos Santos, Edilton J. ; Fuck, Reinhadt A. ; Lima, Haroldo M. / Two-stage terrane assembly in Western Gondwana : Insights from structural geology and geophysical data of central Borborema Province, NE Brazil. In: Journal of Structural Geology. 2017 ; Vol. 103. pp. 167-184.
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abstract = "Combined geophysical and structural data from the Transversal Subprovince of the Borborema Province (NE Brazil) highlight the internal structure of, and interrelationships between, the constituent terranes. Radiometric and magnetic maps show distinctive signatures for the Archean-Paleoproterozoic Alto Moxot{\'o} and Meso-to Neoproterozoic Alto Paje{\'u} and Pernambuco-Alagoas terranes. Mapped radiometric and first and second order magnetic lineaments, associated with Euler deconvolution, enable correlation between geophysical data and major structures. In addition to early related deformation of the Alto Moxot{\'o} Terrane, combined analysis of late transposition foliations, lineations and kinematic criteria reveal a complex structural evolution marked by two distinct assembly stages. The first phase is characterized by thrust tectonics with top-to-the-south vergence, resulting in the juxtaposition of the allochtonous Alto Paje{\'u} Terrane with the structurally underlying Alto Moxot{\'o} Terrane. The terrane boundary is delineated by the Serra de Jabitac{\'a} Shear Zone, which is associated with low dipping collisional granitic sheets and ca. 1.0 Ga mafic-ultramafic rocks interpreted as obtudcted ophiolite remnants. Later strike-slip movements strongly folded and obliterated thrust-related markers, and the continental scale E-W Pernambuco Lineament is interpreted as the result of lateral assembly between the composite Alto Paje{\'u}-Alto Moxot{\'o} terranes and the Pernambuco-Alagoas Terrane during the metamorphic peak of the Brasiliano orogeny. Evolution of the Borborema Province reflects accretionary processes during the assembly of Western Gondwana.",
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Two-stage terrane assembly in Western Gondwana : Insights from structural geology and geophysical data of central Borborema Province, NE Brazil. / Santos, Lauro Cézar M.de Lira; Dantas, Elton L.; Vidotti, Roberta M.; Cawood, Peter A.; dos Santos, Edilton J.; Fuck, Reinhadt A.; Lima, Haroldo M.

In: Journal of Structural Geology, Vol. 103, 01.10.2017, p. 167-184.

Research output: Contribution to journalArticleResearchpeer-review

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