Copper and nickel mineralization in Upper Devonian terrigenous sediments of southeastern Voronezhskaya region

The distribution of bravoite and nickeliferous marcasite in central Britain BRAVOITE and nickeliferous pyrite as primary phases have two major low-temperature associations. Firstly, they occur within the Pb-Zn-baryte-fluorite deposits of the Mississippi Valley type. The bravoite is paragenetically early, either being diagenetic as in the Cave-in-Rock district of Illinois (Park, I967), or epigenetic as at Millclose mine (Bannister, 194o) and Masson Hill (Ixer, I974) in southeast Derbyshire and Dirtlow Rake and Treak Cliff in northern Derbyshire (Lunn et al., I974). Secondly, they occur within mineralized red-bed sandstone deposits of a more variable mineralogy. These include the highly zoned bravoites from the Pb-Zn deposits within the Bunter sandstones of Mechernich, Eifel, and of Maubach, Rhineland, Germany (Baumann, I976), occurrences within the Zn-Cu-Pb-Co-Ni deposits of the Permo-Triassic sandstones of Beyr6de quarry, southern France (Wahbi et al., I973) and the Cu-Ni deposits of the Devonian of the Voronezh region U.S.S.R. (Ageykin et al., I969). They also occur in an allied class of deposits, those formed from leached redbeds. Here bravoite can occur epigenetically as in the Magnet Cove Mine, Walton-Cheverie area, Nova Scotia (Boyle, I97I), O r syngenetically as at Fredericktown, Missouri (El Baz et al., I963). Townley (~976) has shown the first association to be common, and the second association to be present, in central Britain. Optically identifiable Pennine Orefield of Co. Durham (Dunham, I948) suggests a wider distribution.

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Copper and nickel mineralization in Upper Devonian terrigenous sediments of southeastern Voronezhskaya region

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The distribution of bravoite and nickeliferous Marcasite in central Britain

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