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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

eformation mechanisms, mineral chemistry and zircon U-Pb geochronological constraints in the south Patos shear zone: implications for the crustal evolution of the Borborema Province, NE Brazi

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Author(s):
de Souza, Carolina Peixoto [1] ; Ferreira Viegas, Luis Gustavo [1] ; Montefalco de Lira Santos, Lauro Cezar [2]
Total Authors: 3
Affiliation:
[1] Univ Brasilia, Inst Geociencias, Brasilia, DF - Brazil
[2] Univ Fed Pernambuco, Dept Geol, Recife, PE - Brazil
Total Affiliations: 2
Document type: Journal article
Source: BRAZILIAN JOURNAL OF GEOLOGY; v. 51, n. 4 2021.
Web of Science Citations: 0
Abstract

The southern boundary of the Patos Shear Zone (PSZ) is characterized by mylonites resulting from the deformation of Paleoproterozoic basement gneisses, Neoproterozoic metavolcanic and metasedimentary rocks, granitic and granodioritic intrusions. Among the latter, the Santa Terezinha and Catingueira plutons show stretched shapes in agreement with the the shear zone's regional trend. Recrystallized quartz grains in these plutons accommodate deformation by dislocation creep. The host banded gneisses show similar deformation structures to the plutons. Quartz crystallographic fabrics mainly record the activity of basal and prism slip planes with local contribution of rhomb planes, whilst feldspar clasts show evidence of intracrystalline deformation in the larger porphyroclasts. These characteristics suggest that shearing occurred at lower-amphibolite facies conditions. U-Pb zircon data for the Santa Terezinha pluton yields an age of 625 +/- 7 Ma, which, coupled with the pluton elongated shape and microstructure, suggests that its emplacement was pre-kinematic in relation to the Patos shear zone. Post-emplacement elongation of the granite body occurred along the strike-slip trend. Such structural and geochronological constraints highlight the close association between magma emplacement and shear zone deformation during distinct stages of the Brasiliano-Pan-African orogeny in the Borborema Province. (AU)

FAPESP's process: 09/17537-1 - Deformation mechanisms and event chronology in the Patos shear zone, Borborema Province (Northeastern Brazil)
Grantee:Luís Gustavo Ferreira Viegas
Support type: Scholarships in Brazil - Doctorate