CHEMISTRY AND DISTRIBUTION OF ACCESSORY NI, CO, FE ARSENIC MINERALS IN THE PECHENGA NI-CU DEPOSITS, KOLA PENINSULA, RUSSIA
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dc.contributor.author | Abzalov M.Z. | |
dc.contributor.author | Brewer T.S. | |
dc.contributor.author | Polezhaeva L.I. | |
dc.date.accessioned | 2020-12-31T03:40:58Z | |
dc.date.available | 2020-12-31T03:40:58Z | |
dc.date.issued | 1998 | |
dc.identifier | https://elibrary.ru/item.asp?id=13286343 | |
dc.identifier.citation | Mineralogy and Petrology, 1998, , 1, 145-161 | |
dc.identifier.issn | 0930-0708 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/21798 | |
dc.description.abstract | Ni, Co, Fe arsenic minerals are common accessory phases associated with both the Ni-Cu mineralization and country rock sulphides of the Pechenga complex. The majority of the arsenic minerals fall in the cobaltite-gersdorffite series, with minor arsenopyrite, nickeline and maucherite. These minerals are regularly distributed between different types of mineralization. Nickeline, maucherite and gersdorffite occur mainly in hydrothermally altered Ni-Cu sulphide ores, in particular stringer zone sulphides and mineralized talc-carbonate rocks. Arsenopyrite occurs only in pentlandite-free assemblages of the host shales, mainly in remobilized iron sulphide mineralization. The concentrations of Ni and Co in arsenopyrite decrease with the distance from the Ni-Cu bearing intrusions. Cobaltite is an ubiquitous mineral, but Ni-rich cobaltite occurs mainly in the Ni-Cu ores. In general, the transition from Ni-Cu ores to country rocks is marked by the change from Ni-arsenides to Ni-Co sulpharsenides and, finally, to Fe sulpharsenides. Sedimentary pyrite in sulphidic shales contains up to 1.8 wt.% As and was initially enriched in arsenic during sedimentation and diagenesis. Metamorphic recrystallization of authigenic As-bearing pyrite to As-free pyrrhotite led to significant liberation of arsenic during metamorphism. The mobilized arsenic could have been carried by associated metamorphic fluids and then participated in the low-grade alteration of the ultramafic rocks and associated Ni-Cu sulphide ores. | |
dc.title | CHEMISTRY AND DISTRIBUTION OF ACCESSORY NI, CO, FE ARSENIC MINERALS IN THE PECHENGA NI-CU DEPOSITS, KOLA PENINSULA, RUSSIA | |
dc.type | Статья |
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