Rare Earth Element and yttrium compositions of Archean and Paleoproterozoic Fe formations revisited: New perspectives on the significance and mechanisms of deposition

Planavsky, Noah J.; Bekker, Andrey; Rouxel, Olivier; Kamber, Balz S.; Hofmann, Axel; Knudsen, Andrew; Lyons, Timothy W.

doi:10.1016/j.gca.2010.07.021

Cited by 421 publications

(254 citation statements)

References 109 publications

(181 reference statements)

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“…An argument in favour of photoferrotrophy having played a prominent role in IF deposition is that much of the evidence for pre-GOE surface-ocean oxygenation remains contested and proxies that specifically focus on shallow-ocean redox conditions, such as carbonate iodine (Hardisty et al, 2014) and REEs (Planavsky et al, 2010a), point to the dominance of IF and carbonate deposition under broadly anoxic conditions in the oceans until the GOE. Supporting this, molecular phylogenetic analysis of many enzymes involved in (bacterio)-chlorophyll biosynthesis suggests that anoxygenic photosynthetic lineages are likely more deeply rooted than oxygenic cyanobacterial lineages (Xiong, 2006).…”

Section: Evidence In the Rock Record For The Evolution Of Photoferrotmentioning

confidence: 99%

“…In many Archaean and early Palaeoproterozoic IFs there are no Ce anomalies (Planavsky et al, 2010a), and thus no deviation from trivalent Ce behaviour (e.g., Fryer, 1977a;Bau and Möller, 1993;Bau et al, 1997;Alexander et al, 2008;Frei et al, 2008). This suggests that the water column from which Fe(III) oxyhydroxides precipitated was relatively anoxic, or at least below the Eh of the Ce 4+ /Ce 3+ redox couple (Bau and Dulski, 1996).…”

Section: Iron Formations As Tracers Of Seawater Redoxmentioning

confidence: 99%

“…17). Late Palaeoproterozoic IFs show significant ranges in light-to-heavy REE (Pr/Yb (SN) ) and Y/Ho ratios, which likely reflect variable fractionation of REE+Y by Mn(IV)-Fe(III)-oxyhydroxide precipitation and dissolution (Planavsky et al, 2010a).…”

mentioning

confidence: 99%

“…These ranges are similar to those seen in modern anoxic basins. In contrast, most Archaean and early Palaeoproterozoic IFs deposited before the rise of atmospheric oxygen are characterised by light REE+Y depletion (Planavsky et al, 2010a). This consistent depletion in LREE suggests the lack of a discrete redoxcline during this time period and points toward O 2 -independent Fe(II) oxidation mechanisms.…”

mentioning

confidence: 99%

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Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Konhauser

Planavsky

Hardisty

et al. 2017

Earth-Science Reviews

382

257

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Section: Evidence In the Rock Record For The Evolution Of Photoferrotmentioning

confidence: 99%

Section: Iron Formations As Tracers Of Seawater Redoxmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Konhauser

Planavsky

Hardisty

et al. 2017

Earth-Science Reviews

382

257

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“…Fractionation of these elements in seawater occurs most probably by scavenging of Ho by particulate matter, resulting in the hyperchondritic values of 44 to 74 as found in modern oceans, which is higher than for shales (~ 27;Bau 1996;Nozaki et al 1997). Early Paleoproterozoic BIFs, considered to reflect chemical conditions of ancient oceans, have positive Y anomalies and an average Y/Ho ratio of 39 (Planavsky et al 2010). …”

Section: Rare Earth Elements and Yttrium Behaviormentioning

confidence: 99%

Chemical fingerprint of iron oxides related to iron enrichment of banded iron formation from the Cauê Formation - Esperança Deposit, Quadrilátero Ferrífero, Brazil: a laser ablation ICP-MS study

et al. 2015

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Chemical signatures of iron oxides from dolomitic itabirite and high-grade iron ore from the Esperança deposit, located in the Quadrilátero Ferrífero, indicate that polycyclic processes involving changing of chemical and redox conditions are responsible for the iron enrichment on Cauê Formation from Minas Supergroup. Variations of Mn, Mg and Sr content in different generations of iron oxides from dolomitic itabirite, high-grade iron ore and syn-mineralization quartz-carbonate-hematite veins denote the close relationship between high-grade iron ore formation and carbonate alteration. This indicates that dolomitic itabirite is the main precursor of the iron ore in that deposit. Long-lasting percolation of hydrothermal fluids and shifts in the redox conditions have contributed to changes in the Y/Ho ratio, light/heavy rare earth elements ratio and Ce anomaly with successive iron oxide generations (martite-granular hematite), as well as lower abundance of trace elements including rare earth elements in the younger specularite generations.KEYWORDS: high-grade iron ore; geochemistry; iron oxide; LA-ICP-MS analysis. RESUMO: As assinaturas químicas dos óxidos de ferro presentes no itabirito dolomítico e no minério de ferro de alto teor do Depósito de Esperança, localizado no Quadrilátero Ferrífero, indicam que processos policíclicos envolvendo mudanças nas condições químicas e de redox são res ponsáveis pelo enriquecimento em ferro na Formação Cauê do Supergrupo Minas. A variação nos conteúdos relativos de Mn, Mg e Sr nas diferentes gerações de óxidos de ferro encontradas no itabirito dolomítico, no minério de ferro de alto teor e nos veios de quartzo carbonato hematita associados à mineralização denotam uma estreita relação entre a formação do corpo de minério de ferro de alto teor e a alteração dos carbonatos. Isso indica que o itabirito dolomítico é o principal precursor do corpo de minério naquele depósito. Percolação de longa duração de fluidos hidrotermais e mudança nas condições de redox contribuíram para a alteração das razões Y/Ho, elementos terras raras leves/pesados e da anomalia de Ce com sucessivas gerações de óxido de ferro (martita hematita granular), bem como depleção dos conteúdos de elementos traço, incluindo os elementos terras raras das gerações mais recentes de especularita. PALAVRAS-CHAVE: minério de ferro de alto teor; geoquímica; óxido de ferro; análise por LA ICP MS.Chemical fingerprint of iron oxides related to iron enrichment of banded iron formation from the Cauê FormationEsperança Deposit, Quadrilátero Ferrífero, Brazil: a laser ablation ICP-MS study INTRODUCTIONThe genesis of high-grade iron ore bodies has been extensively discussed worldwide. Different processes such as hydrothermal syn-metamorphic (Guild 1953(Guild , 1957Dorr 1965Dorr , 1969, residual supergene (Dorr 1964; Eichler 1968;Melfi et al. 1976), or paleo-supergene enrichment (Morris 1980(Morris , 1987Harmsworth et al. 1990), and the juxtaposition of hypogene and supergene fluids (Hagemann et al. 1999(Hagemann et al....

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The Global Iron Cycle

Kendall¹,

Anbar²,

Kappler³

et al. 2012

Fundamentals of Geobiology

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Rare Earth Element and yttrium compositions of Archean and Paleoproterozoic Fe formations revisited: New perspectives on the significance and mechanisms of deposition

Cited by 421 publications

References 109 publications

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Iron formations: A global record of Neoarchaean to Palaeoproterozoic environmental history

Chemical fingerprint of iron oxides related to iron enrichment of banded iron formation from the Cauê Formation - Esperança Deposit, Quadrilátero Ferrífero, Brazil: a laser ablation ICP-MS study

The Global Iron Cycle

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