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Iron deposits hosted by banded iron-formations in the Yilgarn Craton: Products of sequential iron enrichment by magmatic, marine and meteoric fluids

Thomas Angerer, David Banks, Steffen Hagemann, Paul Duuring

Mesoarchean Algoma-type BIF in the Yilgarn Craton are locally enriched by secondary processes to iron concentrations approaching 72 wt% Fe. While their near-surface goethite–hematite ores are unequivocally the product of supergene fluid alteration, their deeper magnetite and crystalline hematite–martite ores have a contentious origin. This study shows that magnetite ores formed after diagenesis and peak greenschist facies metamorphism of BIF, coinciding with regional deformation events.