Evidence for metre-scale variations in hematite composition within the Palaeoproterozoic Itabira Iron Formation, Minas Gerais, Brazil

Mineralogical Magazine

Volumn 70, Issue 5, 2006, Pages 591-602

  Cabral, A R ^a   Lehmann, B ^b   Galbiatti, H F ^c   Rocha Filho, O G ^c  

^a RHODES UNIVERSITY   (South Africa)

^b CLAUSTHAL UNIVERSITY OF TECHNOLOGY   (Germany)

^c VALE S A   (Brazil)

Author keywords

Brazil; High grade hematite deposits; Minas Gerais; Mineral chemistry of hematite; Palaeoproterozoic Itabira Iron Formation; Palladiferous gold mineralization; Quadril tero Ferr fero

Indexed keywords

ELECTRON MICROSCOPY; GEOCHEMISTRY; GOLD DEPOSITS; IRON ORES; PETROLOGY; STOICHIOMETRY; TECTONICS;

HEMATITE; MINERAL CHEMISTRY; MINERALIZATION;

MINERALOGY;

CHEMICAL COMPOSITION; CHROMIUM; HEMATITE; MINERALIZATION; PROTEROZOIC; STOICHIOMETRY;

BRAZIL; MINAS GERAIS; SOUTH AMERICA;

EID: 33846973664     PISSN: 0026461X     EISSN: None     Source Type: Journal    
DOI: 10.1180/0026461067050352     Document Type: Article

References (39)

1. Alkmim, F.F. and Marshak, S. (1998) Transamazonian orogeny in the Southern São Francisco craton region, Minas Gerais, Brazil: evidence for Paleoproterozoic collision and collapse in the Quadrilátero Ferrífero. Precambrian Research, 90, 29-58.
2. Babinski, M., Chemale Jr., F. and Van Schmus, W.R. (1995) The Pb/Pb age of the Minas Supergroup carbonate rocks, Quadrilátero Ferrífero, Brazil. Precambrian Research, 72, 235-245.
3. Barbosa, A.L.M. and Grossi Sad, J.H. (1973) Tectonic control of sedimentation and trace-element distribution in iron ores of central Minas Gerais (Brazil). Proceedings of the Kiev Symposium, 1970, UNESCO, Earth Sciences, 9, 125-131.
4. Beukes, N.J., Gutzmer, J. and Mukhopadhyay, J. (2003) The geology and genesis of high-grade hematite iron ore deposits. Applied Earth Science (Transactions of the Institution of Mining and Metallurgy B), 112, B18-B25.
5. Bustillo, M.A., Garcia-Guinea, J., Martinez-Frias, J. and Delgado, A. (1999) Unusual sedimentary geodes filled by gold-bearing hematite laths. Geological Magazine, 136, 671-679.
6. Cabral, A.R. (2003) Spessartine-tourmaline-bearing manganiferous itabirite at Miguel Congo: petrographic evidence for a Mn-rich meta-exhalite in the Quadrilátero Ferrífero of Minas Gerais, Brazil. Applied Earth Science (Transactions of the Institution of Mining and Metallurgy B), 112, B313-B318.
7. Cabral, A.R. (in press) Palladiferous Gold Mineralisation (ouro preto) in Brazil: Gongo Soco, Itabira and Serra Pelada. Geologisches Jahrbuch, Sonderhefte, Reihe D, Heft SD 8, E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany.
8. Cabral, A.R. and Lehmann, B. (2003) A two-stage process of native palladium formation at low temperatures: evidence from a palladian gold nugget (Gongo Soco iron ore mine, Minas Gerais, Brazil). Mineralogical Magazine, 67, 453-463.
9. Cabral, A.R., Lehmann, B., Kwitko, R. and Jones, R.D. (2002a) Palladian gold and palladium arsenide-antimonide minerals from Gongo Soco iron ore mine, Quadrilátero Ferrífero, Minas Gerais, Brazil. Applied Earth Science (Transactions of the Institution of Mining and Metallurgy B), 111, B74-B80.
10. Cabral, A.R., Lehmann, B., Kwitko, R., Galbiatti, H.F. and Pereira, M.C. (2002b) Palladseite and its oxidation: evidence from Au-Pd vein-type mineralization (jacutinga), Cauê iron-ore mine, Quadrilátero Ferrífero, Minas Gerais, Brazil. Mineralogical Magazine, 66, 327-336.
11. Cabral, A.R., Lehmann, B., Kwitko, R., Jones, R.D. and Rocha Filho, O.G. (2003a) On the association of palladium-bearing gold, hematite and gypsum in an ouro preto nugget. The Canadian Mineralogist, 41, 473-478.
12. Cabral, A.R., Rocha Filho, O.G. and Jones, R.D. (2003b) Hydrothermal origin of soft hematite ore in the Quadrilátero Ferrífero of Minas Gerais, Brazil: petrographic evidence from the Gongo Soco iron ore deposit. Applied Earth Science (Transactions of the Institution of Mining and Metallurgy B), 112, B279-B286.
13. Cabral, A.R., Suh, C.E., Kwitko-Ribeiro, R. and Rocha Filho, O.G. (in press) Brittle microstructures in gold nuggets: a descriptive study using backscattered electron imaging. Ore Geology Reviews.
14. Chauvet, A., Faure, M., Dossin, I. and Charvet, J. (1994) A three-stage structural evolution of the Quadrilátero Ferrífero: consequences for the Neoproterozoic age and the formation of gold concentrations of the Ouro Preto area, Minas Gerais, Brazil. Precambrian Research, 68, 139-167.
15. Chemale Jr., F., Quade, H. and Carbonari, F.S. (1987) Economic and structural geology of the Itabira Iron District, Minas Gerais, Brazil. Zentralblatt für Geologie und Paläontologie Teil I, 7/8, 743-752.
16. Chemale Jr., F., Rosière, C.A. and Endo, I. (1994) The tectonic evolution of the Quadrilátero Ferrífero, Minas Gerais, Brazil. Precambrian Research, 65, 25-54.
17. Dorr, J.V.N. (1965) Nature and origin of the high-grade hematite ores of Minas Gerais, Brazil. Economic Geology, 60, 1-46.
18. Dorr, J.V.N. (1969) Physiographic, stratigraphic and structure development of the Quadrilátero Ferrífero, Minas Gerais, Brazil. United Stated Geological Survey Professional Paper, 641-A, 110 pp.
19. Dorr, J.V.N. and Barbosa, A.L.M. (1963) Geology and ore deposits of the Itabira district, Minas Gerais, Brazil. United States Geological Survey Professional Paper, 341-C, 110 pp.
20. Essarraj, S., Boiron, M.-C., Cathelineau, M. and Fourcade, S. (2001) Multistage deformation of Au-quartz veins (Laurieras, French Massif Central): evidence for late gold introduction from microstructural, isotopic and fluid inclusion studies. Tectonophysics, 336, 79-99.
21. Galbiatti, H.F. (1999) Natureza e Controle Estrutural da Mineralização Aurífera (Jacutinga) na Mina do Cauê, Itabira, MG. M.Sc. thesis (unpublished), Departamento de Geologia, Universidade Federal de Ouro Preto, Ouro Preto, Brazil, 150 pp.
22. Harder, E.C. and Chamberlin, R.T. (1915) The geology of central Minas Geraes, Brazil. Journal of Geology, 23, 341-378, 385-424.
23. Henwood, W.J. (1871) On the gold mines of Minas Geraes, in Brazil. Transactions of the Royal Geological Society of Cornwall, 8, 168-370.
24. Hippertt, J. and Davis, B. (2000) Dome emplacement and formation of kilometre-scale synclines in a granite-greenstone terrain (Quadrilátero Ferrífero, southeastern Brazil). Precambrian Research, 102, 99-121.
25. Hoefs, J., Müller, G. and Schuster, A.K. (1982) Polymetamorphic relations in iron ores from the Iron Quadrangle, Brazil: the correlation of oxygen isotope variations with deformation history. Contributions to Mineralogy and Petrology, 79, 241-251.
26. Hussak, E. (1904) Über das Vorkommen von Palladium und Platin in Brasilien. Sitzungsberichte der mathematisch-naturwissenschaftlichen Klasse der Kaiserlichen Akademie der Wissenschaften, 113, 379-468.
27. Jedwab, J. and Cassedanne, J. (1998) Historical observations on oxygen-bearing compounds of platinum and palladium in Minas Gerais, Brazil. The Canadian Mineralogist, 36, 887-893.
28. Johnson, P.N. and Lampadius, W.A. (1837) Ueber brasilianisches Palladgold und dessen Ausbringen und Scheidung. Journal für praktische Chemie, 11, 309-315.
29. Kessler, W. and Müller, G. (1988) Minor and trace-element data of iron oxides from iron-formations of the Iron Quadrangle, Minas Gerais, Brazil. Mineralogy and Petrology, 39, 245-250.
30. Klein, C. and Ladeira, E.A. (2000) Geochemisty and petrology of some Proterozoic banded iron-formations of the Quadrilátero Ferrífero, Minas Gerais, Brazil. Economic Geology, 95, 405-428.
31. Lagoeiro, L.E. (1998) Transformation of magnetite to hematite and its influence on the dissolution of iron oxide minerals. Journal of Metamorphic Geology, 16, 415-423.
32. Lobato, L.M., Ribeiro-Rodrigues, L.C., Zucchetti, M., Noce, C.M., Baltazar, O.F., Silva, L.C. and Pinto, C.P. (2001) Brazil's premier gold province. Part I: The tectonic, magmatic, and structural setting of the Archean Rio da Velhas greenstone belt, Quadrilátero Ferrífero. Mineralium Deposita, 36, 228-248.
33. Lüders, V., Romer, R.L., Cabral, A.R., Schmidt, C., Banks, D.A. and Schneider, J. (2005) Genesis of itabirite-hosted Au-Pd-Pt-bearing hematite-(quartz) veins, Quadrilátero Ferrífero, Minas Gerais, Brazil: constraints from fluid inclusion infrared microthermometry, bulk crush-leach analysis and U-Pb systematics. Mineralium Deposita, 40, 289-306.
34. Mücke, A. (2005) The Nigerian manganese-rich iron-formations and their host rocks - from sedimentation to metamorphism. Journal of African Earth Sciences, 41, 407-436.
35. Olivo, G.R., Gauthier, M., Bardoux, M., Sá, E.L., Fonseca, J.T.F. and Santana, F.C. (1995) Palladium-bearing gold deposit hosted by Proterozoic Lake Superior-type iron-formation at the Cauê iron mine, Itabira district, southern São Francisco craton, Brazil: geologic and structural controls. Economic Geology, 90, 118-134.
36. Pires, F.R.M. (1995) Textural and mineralogical variations during metamorphism of the Proterozoic Itabira Iron Formation in the Quadrilátero Ferrífero, Minas Gerais, Brazil. Anais da Academia Brasileira de Ciências, 67, 77-105.
37. Rosière, C.A. and Rios, F.J. (2004) The origin of hematite in high-grade iron ores based on infrared microscopy and fluid inclusion studies: the example of the Conceição mine, Quadrilátero Ferrífero, Brazil. Economic Geology, 99, 611-624.
38. Rosière, C.A., Siemes, H., Quade, H., Brokmeier, H.-G. and Jansen, E.M. (2001) Microstructures, textures and deformation mechanisms in hematite. Journal of Structural Geology, 23, 1429-1440.
39. Touzeau, E.M. (1892) Gold-mining in Brazil. Transactions of the Federated Institution of Mining Engineers, 4, 219-232.