Finite strain quantification in Cariris Velhos Metagranitoids of Alagoa Grande (PB)

Authors

  • Sérgio Wilians de Oliveira Rodrigues Superintendência Regional de São Paulo; Serviço Geológico do Brasil
  • Carlos José Archanjo Universidade de São Paulo; Instituto de Geociências; Departamento de Mineralogia e Geotectônica
  • Carlos Henrique Grohmann Universidade de São Paulo; Instituto de Geociências; Departamento de Geologia Sedimentar e Ambiental

DOI:

https://doi.org/10.5327/Z1519-874X2010000300005

Keywords:

Strain analysis, Deformation ellipsoid, Inertia tensor, Intercepts method, Cariris Velhos Metagranitoids

Abstract

The Cariris Velhos Metagranitoids are considered an important geological unit of the Transversal Zone (Borborema Province - NE Brazil). We evaluated the use of raw and processed digital images to obtain the deformation ellipsoid for the Cariris Velhos Metagranitoids using the Inertia Tensor and Intercepts methods. The ellipsoid symmetry of the deformed fabric was very similar for both methods, the Inertia Tensor and Intercepts, although with different anisotropy values. The orientations of the ellipsoid axes are similar to the orientation of geological structures observed in the field (principal foliations and mineral lineations). When analyzing the characteristics of the deformation ellipsoids obtained in this study, it is worth pointing out the strong orientation of the C-axis (foliation pole) and the predominance of ellipsoids associated with planar to planar- linear fabrics (flattening field). The deformation observed in the Cariris Velhos Metagranitoids is associated with the development under transpressive stress of regional Brasiliano shear zones.

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Published

2010-10-01

Issue

Vol. 10 No. 3 (2010)

Section

Articles

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How to Cite

Rodrigues, S. W. de O., Archanjo, C. J., & Grohmann, C. H. (2010). Finite strain quantification in Cariris Velhos Metagranitoids of Alagoa Grande (PB) . Geologia USP. Série Científica, 10(3), 57-78. https://doi.org/10.5327/Z1519-874X2010000300005