Specularitic iron ores and shear zones in the Quadrilátero Ferrífero District
| Autor: | F. J. Rios, C. A. Rosière |
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| Rok vydání: | 2006 |
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| Zdroj: | Applied Earth Science. 115:134-138 |
| ISSN: | 1743-2758 0371-7453 |
| DOI: | 10.1179/174327506x139002 |
| Popis: | In the eastern high-strain domain of the Quadrilatero Ferrifero, Brazil, hard and soft high-grade hematite ore may occur as schistose bodies in shear zones mainly related to the Cambotas-Fundao thrust system. These orebodies are almost entirely constituted of oriented specularite platelets that develop both as a product of crystal–plastic deformation of hematite and solution-precipitation processes. Both mechanisms interact in the partitioning of the strain, while solution-precipitation is responsible for the precipitation of hematite and localised leaching of silica resulting in the formation of syntectonic ores. The analyses of fluid inclusions from specularite crystals of the Conceicao and Timbopeba deposits, located in the northern and southernmost areas of the eastern high-strain domain of the Quadrilatero Ferrifero, were studied using infrared microthermometry and synchrotron X-ray fluorescence. The results indicate the participation of highly saline aqueous H2O–NaCl fluids containing other ... |
| Databáze: | OpenAIRE |
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