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Shear Zones of the Borborema Province, Including the Pernambuco Shear Zone

Roberto Weinberg, Monash University, Australia

Gorki Mariano, Univeridade Federal de Pernambuco




Copyright 2004-2011 by Roberto Weinberg. All rights reserved. Unlimited permission to copy or use is hereby granted for non-profit driven enterprise, subject to inclusion of this copyright notice and acknowledgment of the source URL:


I would very much appreciate an email stating how this material will be used: Roberto Weinberg, Monash University, Australia. Thanks, RW.


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a) S-C Mylonites

S-C fabric in granite shear zone
Figure 1a-c. Well developed S-C fabric in granitic rock with mafic enclaves, pt 22.
S-C fabric in granite shear zone
Figure 1b.


S-C fabric in granite shear zone
Figure 1c.
S-C fabric in granite shear zone
Figure 2. Same granitic pluton as in Fig. 1. Shear zone termination


b) East Pernambuco Shear Zone, Serra das Russas



crenulated mylonite
Figure 1b. Zoom in showing the hinge zone of folded mylonite where a new mylontic axial planar cleavage is developed.


Figure 1a (left). Vertical cross-section of dextral mylonite and ulltramylonite of the Pernambuco shear zone, at Serra das Russas. Notice the mafic band  that defines a fold.


Figure 3. Folded mylonite. Notice finest grained ultramylonite at the contact with a more mafic rock.
Figure 4. Silicified ultramylonite, only metres away from Figures 1-3.


c) Afogados da Ingazeira Shear Zone (photo: courtesy C. Archanjo)


Sinistral stair-stepping, feldspar phenocrysts
Figure 5. Sinistral stair-stepping on tails around feldspar phenocrysts on NE-trending shear zone