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Table 3: Average of rare earth element contents in iron formation of this study compared with some iron formations of the QF region and from other parts of the world. a Paleoproterozoic banded iron formation (Itabirite of Caué Fm.) (Spier et al, 200 b Jaspilite of Carajas Formation (Macambira and Schrank, 2002)) c Hamersley banded formation (Glikson et al. 2004) d Transvaal Supergroup, Kuruman BIF (oxide facies) (Klein and Beukes, 1989) e Surgur Belt, India, (Kato et al., 1996)

Table 3 Average of rare earth element contents in iron formation of this study compared with some iron formations of the QF region and from other parts of the world. a Paleoproterozoic banded iron formation (Itabirite of Caué Fm.) (Spier et al, 200 b Jaspilite of Carajas Formation (Macambira and Schrank, 2002)) c Hamersley banded formation (Glikson et al. 2004) d Transvaal Supergroup, Kuruman BIF (oxide facies) (Klein and Beukes, 1989) e Surgur Belt, India, (Kato et al., 1996)

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Figure 1: Simplified geological map of the Quadrilatero Ferrifero (after Dorr, 1969), (SFC) Sao Francisco Craton. Sampled iron ore deposits: IT — Itatiaiugu, AV — AVG Mineragao, CO — Cérrego do Meio, PI — Piedade, CM — Capitéo do Mato, TA — Tamandua, PC — Pico do Itabirito, MF — Mina de Fabrica, GS — Gongo Soco, BA — Bau, MM — Morro da Mina, FZ — Fazendao, AL — Alegria, FN — Fabrica Nova, TO — Timbopeba, CE — Mina de Conceigao, PQ — Mina do Periquito, DC — Mina de Dois Cérregos, ON — Mina do Onga, CH — Mina da Chacrinha, CA — Mina de Caué. The Quadrilatero Ferrifero (QF) comprises an approximately square area of ca. 7.000 km? and hosts one of the largest iron ore deposit in the world (Figure‘). Researchers have focused on trace and rare earth elements to reveal the origin of classical Iron Formations (IFs) around the world such as the Algoma and Lake Superior-type (Gross, 1980), Hamersley in western Australia (Alibert and Mcculloch,
Figure 1: Simplified geological map of the Quadrilatero Ferrifero (after Dorr, 1969), (SFC) Sao Francisco Craton. Sampled iron ore deposits: IT — Itatiaiugu, AV — AVG Mineragao, CO — Cérrego do Meio, PI — Piedade, CM — Capitéo do Mato, TA — Tamandua, PC — Pico do Itabirito, MF — Mina de Fabrica, GS — Gongo Soco, BA — Bau, MM — Morro da Mina, FZ — Fazendao, AL — Alegria, FN — Fabrica Nova, TO — Timbopeba, CE — Mina de Conceigao, PQ — Mina do Periquito, DC — Mina de Dois Cérregos, ON — Mina do Onga, CH — Mina da Chacrinha, CA — Mina de Caué. The Quadrilatero Ferrifero (QF) comprises an approximately square area of ca. 7.000 km? and hosts one of the largest iron ore deposit in the world (Figure‘). Researchers have focused on trace and rare earth elements to reveal the origin of classical Iron Formations (IFs) around the world such as the Algoma and Lake Superior-type (Gross, 1980), Hamersley in western Australia (Alibert and Mcculloch,
Table 1: Trace and rare earth elements of hematitite and itabirite samples, (trace and rare earth elements in ppm); (H) hematitite, (I) itabirite, the rest of sample name refer to the mines listed in figure 1.
Table 1: Trace and rare earth elements of hematitite and itabirite samples, (trace and rare earth elements in ppm); (H) hematitite, (I) itabirite, the rest of sample name refer to the mines listed in figure 1.
range of concentrations (Table 1). Their total abundance is in average 87.8 ppm. V and Co are the most abundant trace elements. V content has an average of 20.6 ppm and concentration within the limits 2.5 and 55 ppm (Table 1). Co concentrations have high average values around 21.6 ppm. Ba also shows a wide limit of concentration between 0.3- 6.1 ppm, having an average of 13.3 ppm. Hf and a present very low concentrations in the itabirite with average and Ta (0.1-0.3 ppm). Ba is an important trace element with concentration relatively higher than the last group of trace elements (Rb-Ta) but with large scattering of values (0.3-35.2 ppm). Sample HAI2 has high values of some trace elements such as V, Co, Y, Sr, Ba and Zr.
range of concentrations (Table 1). Their total abundance is in average 87.8 ppm. V and Co are the most abundant trace elements. V content has an average of 20.6 ppm and concentration within the limits 2.5 and 55 ppm (Table 1). Co concentrations have high average values around 21.6 ppm. Ba also shows a wide limit of concentration between 0.3- 6.1 ppm, having an average of 13.3 ppm. Hf and a present very low concentrations in the itabirite with average and Ta (0.1-0.3 ppm). Ba is an important trace element with concentration relatively higher than the last group of trace elements (Rb-Ta) but with large scattering of values (0.3-35.2 ppm). Sample HAI2 has high values of some trace elements such as V, Co, Y, Sr, Ba and Zr.
Figure 3: Plot of the average concentration of trace-elements of the hematitite and _ itabirite samples.
Figure 3: Plot of the average concentration of trace-elements of the hematitite and _ itabirite samples.
Figure 4: Chondrite (after Evensen ef al., 1978) normalized pattern of rare earth elements (REE) calculated for the hematitite samples (a) and itabirite samples (b).
Figure 4: Chondrite (after Evensen ef al., 1978) normalized pattern of rare earth elements (REE) calculated for the hematitite samples (a) and itabirite samples (b).
Table 2: Average of trace element contents in iron formation of this study compared with some iron formations of the QF region and from other parts of the world. a Paleoproterozoic banded iron formation (Itabirite of Caué Fm.) (Spier et al, 2007) b Itabirite of Caué Fm. (Klein and Ladeira 2000) c Jaspilite od Carajas Formation (Lindenmayer et al., 2001) d Lake superior silicate facies iron-formation (Animikie) (Gross and Macleod, 1980, table 3) e Algoma oxide facies iron-formation (Gross and Macleod, 1980, table 3) f Maru iron formation (oxide facies) (Adeloya, 1998) g Orissa iron-formation (oxide facies), India (Majumber et a/., 1982, table 3)
Table 2: Average of trace element contents in iron formation of this study compared with some iron formations of the QF region and from other parts of the world. a Paleoproterozoic banded iron formation (Itabirite of Caué Fm.) (Spier et al, 2007) b Itabirite of Caué Fm. (Klein and Ladeira 2000) c Jaspilite od Carajas Formation (Lindenmayer et al., 2001) d Lake superior silicate facies iron-formation (Animikie) (Gross and Macleod, 1980, table 3) e Algoma oxide facies iron-formation (Gross and Macleod, 1980, table 3) f Maru iron formation (oxide facies) (Adeloya, 1998) g Orissa iron-formation (oxide facies), India (Majumber et a/., 1982, table 3)
Related topics:
GeologyGeochemistryMineralogyBanded Iron FormationC/N Ratio
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