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Vol. 3 (2000 year), No. 2
Balabonin N.L., Korchagin A.U., Subbotin V.V., Neradovsky Yu.N., Karpov S.M., Pakhomovsky Ya.A., Savchenko Ye.E.
The minerals of platinum metals and new data on major minerals of the Fedorovo-Pansky massif ores
The paper has presented the results of the mineralogical study of the composite low grade sulphide platinum group elements (PGE) of Cu-Ni ores of the layered Fedorovo-Pansky massif. Monosulphides Fe, Ni have a wide range of composition (metal/sulphur, Ni contents) up to the formation of the monosulphide solid solutions (Ni up to 14.1 wt.%). 95 platinum-group minerals (PGM) and unnamed phases (PGP), mainly bismutho-tellurides and tellurides of Pd, Pt, have been found in ores. The most common and widely-distributed species of the PGM are merenskyite (Pd,Pt)(Te,Bi)2; moncheite (Pt,Pd)(Te,Bi)2; kotulskite Pd(Te,Bi); braggite (Pt,Pd,Ni)S and sperrylite PtAs2. The data have been presented on the abundance grain sizes, morphology, microassosiations and composition of the PGM. All common minerals except sperrylite have a wide range of composition. The following conclusions may be drawn: a long history of PGM cristallization in different conditions; Pansky and Fedorova massives are supposed to have different magmatic sources; postore regime of massif cooling took place under chilling condition with fluid loss. The indicator role of the PGM in genetic and typification problems has been emphasized.
(in Russian, стр.26, fig. 9, tables. 11, ref 90, MS Word 95, MS Word 95 3270 Kb)
Vol. 3 (2000 year), No. 2
Balabonin N.L., Korchagin A.U., Subbotin V.V., Karpov S.M., Pakhomovsky Ya.A., Savchenko Ye.E.
The platinum group rare minerals of the low grade sulphide ores of the Fedorovo-Pansky massif
Rare minerals of the platinum group minerals (PGM) of the low grade sulphide ores of Fedorovo-Pansky massif have been described in the paper: (Au,Pd), Hg-, Au-, Sn-, Se-bearing PGM, including PGE-bearing cobaltites-gersdorfites. These minerals may be applied as indicators of ore genesis.
(in Russian, стр.6, fig. 2, tables. 4, ref 8, MS Word 95, MS Word 95 966 Kb)
Vol. 3 (2000 year), No. 2
Subbotin V.V., Korchagin A.U., Balabonin N.L., Savchenko Ye.E., Karpov S.M., Kulakov A.N.
Mineral composition of new shows of platinum-metal mineralization in the eastern part of the Panskaya tundra massif
In the eastern part of the Panskaya tundra massif at Peshempakh and Sungjok sites new shows of platinum-metal ores of a low-sulphide type have been found out. Mineralization is characterized by the high abundance of PGE and Au sum (2 - 24 ppm). The Pd/Pt ratio ranges from 1.2 to 6.7. The Ni abundance varies from 0.06 to 0.26; the Cu abundance - from 0.06 to 0.39 wt%. The main ore minerals are pyrrhotite, chalkopyrite, pentlandite, violarite, pyrite, PGE-bearing cobaltite. Correspondingly to the frequency of occurence and exhalation sizes, kotulskite, merenskyite, moncheite, sperrylite, cooperite and electrum prevail among the noble metal minerals. Morphological features and granulometric composition of minerals have been studied using the optical and electron microscopy methods, and their chemical composition has been studied using the electron microprobe analysis. Compared to other parts of the intrusion an increased prevalence of PGE-bearing sulphoarsenites Co and Ni, electrum and isoferroplatinum has been established. Looking at the global classical analogues the studied mineralization is close to the Great Dyke noble metal mineralization. The positive mineralogical prerequisites of the complex industrial mineralization have allowed to conclude that the eastern part of the Panskaya tundra massif is prospective as a raw material source of PGE, Au, Cu, Ni, Co.
(in Russian, стр.10, fig. 8, tables. 8, ref 7, MS Word 95, MS Word 95 1560 Kb)
Vol. 3 (2000 year), No. 2
Liferovich R.P., Subbotin V.V., Pakhomovsky Ya.A., Lyalina M.F.
New genetic type of scandium mineralization in the iron-ore complex of the Kovdor massif
Scandium mineralization of a new genetic type has been discovered in the baddeleyite-apatite-magnetite deposit related to the Kovdor alkaline-ultrabasic massif, Kola Peninsula, Russia. It is represented by altered dolomite carbonatites containing a new mineral, juonniite in mineralised caverns. Juonniite occurrences are confined to a linear reactivated fault, which intersects phoscorites and carbonatites. Metasomatism of phoscorites caused almost a two-fold enrichment in Sc in clinohumite-bearing units. Late hydrothermal solutions affected cataclastic clinohumite-bearing phoscorites along the fault zone and the subsequent dissolution of sulphides and Sc-bearing minerals (e.g.: forsterite, baddeleyite, pyrochlore group minerals, etc.) was accompanied by mobilisation of traces of Sc, most likely, in the form of carbonate and sulphate. Fluorapatite-bearing altered dolomite carbonatites with abundant cavities provided the necessary conditions for the precipitation of scandium in the form of a hydrous phosphate, juonniite.
(in Russian, стр.10, fig. 6, tables. 2, ref 24, MS Word 95, MS Word 95 1660 Kb)
Vol. 3 (2000 year), No. 2
Subbotin V.V., Subbotina G.F.
Minerals of the pyrochlore group in phoskorites and carbonatites of the Kola Peninsula
The paper contains the characteristics of the pyrochlore group minerals from phoskorites and carbonatites of alkaline-ultrabasic Vuorijarvi, Sebljavr, Kovdor and Sallanlatva massifs. They are represented by pyrochlore, uranopyrochlore, and bariopyrochlore. Among pyrochlores uranium-, calcium-sodium- and barium-bearing varieties are distinguished basing on their chemical composition, time of formation and some other features. Chemical composition and microheterogenity of the minerals and their varieties have been studied using the microprobe method. The main tendencies of the chemical evolution of this group minerals in polystage process of carbonatites formation have been established, as well as the specific features of pyrochlore composition in different massifs.
(in Russian, стр.10, fig. 9, tables. 4, ref 42, MS Word 95, MS Word 95 31700 Kb)