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Title: Characterization of the crystallographic preferred orientation relationships of the magnetite-hematite-goethite phase transformation during martitization
Authors: Nogueira, Victor Mota e
Barbosa, Paola Ferreira
Mayanna, Sathish
Silva, Adalene Moreira
Toledo, Catarina Labouré Bemfica
Lagoeiro, Leonardo Evangelista
Assis, Luciano Mozer de
metadata.dc.identifier.orcid: https://orcid.org/0000-0002-2123-3693
https://orcid.org/0000-0001-7661-455X
metadata.dc.contributor.affiliation: University of Brasilia, Institute of Geoscience
University of Brasilia, Institute of Geoscience
German Research Center for Geosciences
Carl Zeiss Microscopy
University of Brasilia, Institute of Geoscience
University of Brasilia, Institute of Geoscience
Federal University of Paraná, Department of Geology
Vale
Assunto:: Formação ferrífera
Cristalografia
Província Mineral de Carajás
Issue Date: 5-Mar-2022
Publisher: MDPI
Citation: NOGUEIRA, Victor Mota e et. al. Characterization of the crystallographic preferred orientation relationships of the magnetite-hematite-goethite phase transformation during martitization. Minerals, [S. l.], v. 12, n. 326, 2022. DOI: https://doi.org/10.3390/min12030326. Disponível em: https://www.mdpi.com/2075-163X/12/3/326. Acesso em: 21 set. 2023.
Abstract: The most frequent crystallographic preferred orientations developed during the progressive phase transformation of magnetite-hematite-goethite are described and analyzed in two natural samples of banded iron formations from Carajás Mineral Province. Microtextures of martitized grains containing the three phases and the microplaty matrix were analyzed in a scanning electron microscope equipped with a detector for electron backscatter diffraction. For identifying the correlation between magnetite, hematite and goethite lattice and topotaxity during transformation, multiple orientation relationships between the three phases were tested and verified using three-dimensional misorientation analysis. The results show that basal planes of goethite coincide with basal planes of hematite, which coincide with octahedral planes of magnetite. This indicates that transformation between the three minerals happens topotactically, and the oxygen lattice framework is preserved in all members of the reaction as a form of crystallographic memory. As a result of progressive and cyclical changes in oxidation/reduction conditions, an assemblage of high-order orientation relationships is observed and assigned to a complex process of transformation twinning in-between phase transformation of magnetite, hematite and goethite. In the N4WS iron ore deposit, iron oxides/hydroxides from martitized grains work as susceptible markers of environmental changes still in solid state during the diagenetic process.
metadata.dc.description.unidade: Instituto de Geociências (IG)
Licença:: (CC-BY) Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
DOI: https://doi.org/10.3390/min12030326
Appears in Collections:Artigos publicados em periódicos e afins

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