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• W3000386987 abstract "Large iron oxide occurrences have long been recognized in the Neoproterozoic Katangan and Damaran Supergroups of southern Africa, and in the Central African Copperbelt (CACB) these iron oxide occurrences are commonly associated with significant base metal deposits. However, no detailed comparative study of these iron occurrences has previously been conducted, and their relationship to base metal deposits was poorly understood. This is a two-part study, where the primary objective of the first study was to document the hitherto poorly known geology of the Xaudum iron ore prospect in northwest Botswana, one of the largest iron oxide deposits in the region. The second study is a comparison of twelve iron occurrences in the CACB, one in the Kaokoland region of Namibia, and one at Xaudum that was conducted to provide insights into their genesis and to elucidate their relationship to base metal deposits. A combination of geological data from drill core logging and field mapping were integrated with geophysical and drill core assay data to delineate key geologic characteristics at the individual prospects or deposits. Mineralogical and textural observations from optical microscopy of over 140 thin sections, scanning electron microscopy (SEM), and automated mineralogy were combined with geochemical bulk rock and isotopic (δS34, δC13, δO18) analyses to further constrain their genetic relations. The iron occurrence at the Xaudum iron ore prospect consists of two stratiform magnetite-rich horizons hosted within Sturtian Grand Conglomerat Formation diamictites, which have been deformed and metamorphosed to amphibolite facies. The different magnetite-rich units within the potential ore horizons display distinct spatial trends in thickness and mineral abundance relative to the apparent synsedimentary fault-bound paleohighs. These faults appear to also have acted as conduits for hydrothermal fluids responsible for a latter sodic alteration event. Textural relationships and bulk rock geochemical data suggest that the potential iron ore horizon consisted of a pre-metamorphic mineral assemblage of iron oxide-cryptocrystalline quartz-ankerite-dolomite with minimal argillaceous material and units that had a pelitic protolith with disseminated magnetite. Iron occurrences in the CACB at Chafaguma Hill, Kansanshi, Fishtie, and Kamoa in the are also associated with the Grand Conglomerat Formation diamictites while those in Kaokoland in Namibia are associated with the Chuos Formation diamictites. These deposits form stratigraphic units that typically have strike lengths >10 km, occur on paleobasin margins, and except for Kamoa, are interpreted to have a pre-metamorphic protolith consisting of iron oxide minerals and quartz ±ferroan carbonates. These deposits are typically conformably laminated or banded and may contain diamictites and schists with disseminated iron oxides. Textural and contextual evidence suggests that these deposits formed as chemical sediments that are potentially linked to hydrothermal activity and to the unique seawater…" @default.
• W3000386987 created "2020-01-23" @default.
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• W3000386987 date "2016-12-31" @default.
• W3000386987 modified "2023-09-24" @default.
• W3000386987 title "Geologic investigation of iron occurrences in the Katangan and Damaran successions of southern Africa: a comparative study" @default.
• W3000386987 hasPublicationYear "2016" @default.
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