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• W2604866346 abstract "Abstract The geochemistry of chert layers in Algoma-type banded iron formations (BIF) has been used to constrain the depositional setting of the BIFs, as rare earth element (REE) and yttrium (Y) systematics are a function of their chemical environment of formation. In contrast, the chemistry of the interbedded oxide-rich layers ( i.e ., magnetite) has not been analyzed for this purpose because of the presumed potential effects related to diagenetic changes during conversion from primary iron-bearing mineralogy to magnetite. Here, we explore the validity of this latter hypothesis by examining the results of LA-ICP-MS analysis of iron-oxide layers at three Canadian BIF-hosted gold deposits ( i.e ., Meadowbank, Meliadine, Musselwhite) to assess whether the primary REE+Y systematics of the oxide layers are preserved and, if so, what are the implications. The results indicate that, regardless of their diagenetic, later metamorphic, and hydrothermal histories, the chemistry of the iron oxides retains a primary signal in all cases with the following indicated: (1) interaction of the primary Fe-oxyhydroxide phases with seawater, as reflected by heavy REE enrichment relative to light REE depletion that is coupled with variable La and Y enrichment; and (2) some input of moderate-temperature (>250 °C) hydrothermal vent fluids, as suggested by positive Eu anomalies. The chemical data are also used to evaluate currently used classification diagrams for ore deposits based on magnetite chemistry. Our new data indicate that the fields for magnetite geochemistry in BIF are too restricted or lead to misclassification of samples. In the case of the latter, it may be that interaction of fluids with the immediate substrate influences the chemical signature of samples. Therefore, caution is suggested in using these diagrams where hydrothermal fluids are involved in magnetite formation." @default.
• W2604866346 created "2017-04-14" @default.
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• W2604866346 date "2016-05-01" @default.
• W2604866346 modified "2023-10-16" @default.
• W2604866346 title "Do Magnetite Layers In Algoma-Type Banded Iron Formations (BIF) Preserve Their Primary Geochemical Signature? A Case Study of Samples From Three Archean BIF-Hosted Gold Deposits" @default.
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• W2604866346 doi "https://doi.org/10.3749/canmin.1500090" @default.
• W2604866346 hasPublicationYear "2016" @default.
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