| Autor: |
Pereira, Ana Rosa Passos, Fabris, José Domingos, Rios, Francisco Javier, Rosière, Carlos Alberto, da Costa Couceiro, Paulo Rogério, Ferreira, Fábio Furlan, de Menezes, Lucas Morais |
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| Zdroj: |
Hyperfine Interactions; Jan2010, Vol. 195 Issue 1-3, p69-76, 8p |
| Abstrakt: |
Iron oxides are dominant minerals in many geo-domains of economical interest, as iron ore mines. Knowing the main mineral transformation pathways is a fundamental step to plan prospecting new mineral deposits. This study aimed at contributing to a better understanding of the chemical and mineralogical processes related to the genesis and transformations of iron oxides involving hematite in an iron-ore mine of the east border of Quadrilátero Ferrífero, Minas Gerais, Brazil. Two representative geo-samples were analyzed with synchrotron radiation X-ray diffraction (XRD), 57Fe Mössbauer spectroscopy, X-ray fluorescence and saturation magnetization ( σ) measurements. The iron content varied from 65 to 69 mass% Fe. From XRD data, hematite is indeed the major mineral for all samples but characteristic reflections of goethite and magnetite also appear. For the magnetic sample, σ = 6.9 J T − 1 kg − 1. 298 K- and 110 K-Mössbauer data allow characterizing hematite in these iron-rich geo-materials. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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