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EBSD and CL Study of Deformed Quartz Grains in Rocks: An Example for one Strain Fringe Structure From Iron Quadrangle

Published online by Cambridge University Press:  24 June 2019

P. F. Barbosa Open the ORCID record for P. F. Barbosa [Opens in a new window] ,
L. E. Lagoeiro  and
M. A. O. Silva
P. F. Barbosa*
Affiliation:
University of Brasília, Brasília, DF, Brazil
L. E. Lagoeiro
Affiliation:
Federal University of Paraná, Curitiba, PR, Brazil
M. A. O. Silva
Affiliation:
University of Brasília, Brasília, DF, Brazil
*
*Author for correspondence: P. F. Barbosa, E-mail: paolabarbosa@unb.br
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Abstract

Kinematic indicators, including certain strain fringes, represent an important group of structures related to the progressive deformation in rocks. The evolution of these fibrous textures can be explained by the combination of multiple mechanisms of deformation and fluid flow, mainly controlled by the orientation of the strain field and the morphology of the grains. In general, the observations are done with an optical microscope and compared with computational models of growth. This work proposes a combination of crystallographic and cathodoluminescence data obtained in rocks from banded iron formations of the Iron Quadrangle in Brazil to represent an example of how complementary analytical techniques can be useful to understand geological problems. The chosen sample exhibits a strain fringe structure of quartz around a clast of magnetite partially transformed into goethite and hematite. Through the crystallographic data it was possible to identify the grain boundary morphology and domains of low deformation areas. On the other hand, the cathodoluminescence signal evidenced the occurrence of grains with a higher concentration of crystalline defects.

Keywords

cathodoluminescencecomplementary techniqueselectron backscattering diffractiongrain growthrocks
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 25 , Issue 4 , August 2019 , pp. 883 - 890
Copyright
Copyright © Microscopy Society of America 2019 

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