Quantificação da Deformação Finita nos Metagranitoides Cariris Velhos na Região de Alagoa Grande (PB)

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.5327/Z1519-874X2010000300005.

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Authors

Carlos Henrique Grohmann 

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 eld (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 ( attening eld). The deformation observed in the Cariris Velhos Metagranitoids is associated with the development under transpressive stress of regional Brasiliano shear zones.

DOI

https://doi.org/10.31223/osf.io/bpf62

Subjects

Earth Sciences, Physical Sciences and Mathematics, Tectonics and Structure

Keywords

Deformation ellipsoid, Inertia tensor, Intercepts method, Strain Analysis

Dates

Published: 2017-10-31 12:03

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License

CC BY Attribution 4.0 International

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