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• W2115713657 abstract "Sir: Taylor et al. (2001) have presented a hypogene-supergene model for the genesis of the premium martite-microplaty hematite ores derived from banded iron formation (BIF), to replace the supergene-metamorphic model (Morris, 1980, 1985, 1998; Harmsworth et al., 1990). The new model is based on hydrothermal features in two of ten Tom Price hematite deposits, recorded previously as carbonate metasomatism of BIF (Ewers and Morris, 1981), and as localized postore metasomatism (Harmsworth et al., 1990; Morris, 1998). From new data, Taylor et al. (2001) proposed that hypogene leaching of free silica with addition of further siderite in BIF, followed by compaction, produced a general hematite ore precursor. During deep weathering episodes, or even within Tertiary weathering profiles, oxidation of magnetite to martite, and siderite to microplaty hematite and ankerite, followed by leaching of residual gangue, enriched this modified BIF to martite-microplaty hematite ore.In contrast, in the supergene-metamorphic model, martite-microplaty hematite ore genesis is linked to metamorphism of precursor ores of the Phanerozoic supergene martite-goethite type. These comprise about 90 percent of the Hamersley BIF-hosted resource, and deposits range to over a billion tonnes (Harmsworth et al., 1990) and >250 m deep, with high phosphorus levels (0.07–0.17% P). Although stratigraphically thinned by leaching (~35%) they maintain primary BIF banding and texture, with gangue minerals altered to phosphorus-bearing goethite pseudomorphs. Their martite-microplaty hematite analogues (< 0.06 % P) are attributed to Proterozoic supergene enrichment of BIF, with burial metamorphism partly converting the goethite pseudomorphs to secondary, largely microplaty, hematite, yet preserving the primary banding. Some 20 known deposits of this type range from small pockets of enrichment to the massive Mount Whaleback (1700 Mt).Later re-exposures of the microplaty hematite deposits produced further stratigraphic thinning (total ~45–50 %), with loss of phosphorus by leaching of remnant goethite. However, significant …" @default.
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• W2115713657 date "2002-01-01" @default.
• W2115713657 modified "2023-09-25" @default.
• W2115713657 title "GENESIS OF HIGH-GRADE HEMATITE OREBODIES OF THE HAMERSLEY PROVINCE, WESTERN AUSTRALIA—A DISCUSSION" @default.
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• W2115713657 doi "https://doi.org/10.2113/gsecongeo.97.1.177" @default.
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