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D. V. Spiridonova S. V. Krivovichev V. N. Yakovenchuk Ya. A. Pakhomovsky 《Geology of Ore Deposits》2011,53(7):670-677
The Rb- and Sr-exchanged forms of ivanyukite have been obtained and structurally characterized. The chemical formulas derived from the electron microprobe data are as follows: the Rb-exchanged form (Na0.10K0.07Ca0.15Sr0.05Rb1.81Ba0.02)Σ = 2.20[(Ti3.65Nb0.19Fe0.05Mn0.01)Σ = 3.90O2.07/(OH)1.93(Si2.98Al0.02)Σ = 3.00 O12] · 3.61H2O; the Sr-exchanged form (K0.03Sr0.81Ca0.04Ba0.07)Σ = 0.95[(Ti3.74Nb0.19Fe0.03)Σ = 3.96] [O1.83/(OH)2.17](Si2.99Al0.01)Σ = 3.00O12) · 7H2O. The structures of the Rb- and Sr-exchanged forms of ivanyukite have been solved and refined using the least squares method. The structures are based on a mixed three-dimensional octahedral-tetrahedral framework of the pharmacosiderite type with channels occupied by Rb+ and Sr2+ cations and water molecules. The Rb+ cations in the Rb-exchanged form are 12-coordinated, whereas the Sr2+ cations in the Sr-exchanged form are 9- or 7-coordinated. The statistical investigation of the geometric parameters of the pharmacosiderite-type titanosilicates showed that symmetry changes are associated with the interactions of extraframework cations with the O atom of the Ti4(O,OH)4 clusters of the titanosilicate framework. The relationship between the unit-cell parameters in titanosilicates of the pharmacosiderite type and the structural geometric parameters of the titanosilicate framework has been proved by the use of multiple regression equations. 相似文献
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N. G. Konopleva G. Yu. Ivanyuk Ya. A. Pakhomovsky V. N. Yakovenchuk Yu. A. Mikhailova E. A. Selivanova 《Geology of Ore Deposits》2015,57(7):614-625
The occurrence, morphology, and composition of rinkite are considered against the background of zoning in the Khibiny pluton. Accessory rinkite is mostly characteristic of foyaite in the outer part of pluton, occurs somewhat less frequently in foyaite and rischorrite in the central part of pluton, even more sparsely in foidolites and apatite–nepheline rocks, and sporadically in fenitized xenoliths of the Lovozero Formation. The largest, up to economic, accumulations of rinkite are related to the pegmatite and hydrothermal veins, which occur in nepheline syenite on both sides of the Main foidolite ring. The composition of rinkite varies throughout the pluton. The Ca, Na, and F contents in accessory rinkite and amorphous products of its alteration progressively increase from foyaite and fenitized basalt of the Lovozero Formation to foidolite, rischorrite, apatite–nepheline rocks, and pegmatite–hydrothermal veins. 相似文献
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Yakovenchuk V. N. Pakhomovsky Ya. A. Konoplyova N. G. Panikorovskii T. L. Mikhailova Yu. A. Bocharov V. N. Krivovichev S. V. Ivanyuk G. Yu. 《Geology of Ore Deposits》2018,60(7):587-593
Geology of Ore Deposits - Epifanovite, NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O, a new natural copper, sodium and calcium arsenate–phosphate, has been found in a quartz–phosphate pocket... 相似文献
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Yakovenchuk Victor N. Ivanyuk Gregory Yu. Pakhomovsky Yakov A. Panikorovskii Taras L. Britvin Sergei N. Krivovichev Sergey V. Shilovskikh Vladimir V. Bocharov Vladimir N. 《Mineralogy and Petrology》2018,112(1):111-121
Mineralogy and Petrology - Kampelite, Ba3Mg1.5Sc4(PO4)6(OH)3·4H2O, is a new Ba-Sc phosphate from the Kovdor phoscorite-carbonatite complex (Kola Peninsula, Russia). It is orthorhombic, Pnma,... 相似文献
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Yakovenchuk V. N. Pakhomovsky Y. A. Konopleva N. G. Panikorovskii T. L. Bazai A. V. Mikhailova J. A. Bocharov V. N. Krivovichev S. V. 《Doklady Earth Sciences》2022,505(2):549-552
Doklady Earth Sciences - Sergeysmirnovite, MgZn2(PO4)2 · 4H2O, is a new mineral from the oxidation zone of the Kester mineral deposit, Sakha-Yakutia, Russia. This mineral forms... 相似文献
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G. Yu. Ivanyuk Yu. A. Korchak Ya. A. Pakhomovsky Yu. P. Men’shikov V. N. Yakovenchuk 《Geology of Ore Deposits》2012,54(7):575-579
Ulvöspinel is a typical accessory mineral of xenoliths of volcanic and volcanosedimentary rocks in alkaline syenites of the Khibiny and Lovozero plutons. Ulvöspinel forms homogeneous Cr- and V-rich grains in slightly altered olivine basalts, basaltic tuffs, and tuffites and is enriched in Mn and Si in the course of contact-metasomatic alteration of these rocks. The strongly reduced conditions of contact metamorphism controlled by ascending flows of hydrocarbon gases and hydrogen sulfide gave rise to the subsolidus decomposition of primary ulvöspinel and Ti-high magnetite with the formation of ilmenite lamellae and then, with decreasing redox potential, of the second-generation latticed ulvöspinel lamellae. 相似文献
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Yu. A. Mikhailova N. G. Konopleva V. N. Yakovenchuk G. Yu. Ivanyuk Yu. P. Men’shikov Ya. A. Pakhomovsky 《Geology of Ore Deposits》2007,49(7):590-598
Five minerals of the corundum group have been identified in the Khibiny pluton with certainty. Corundum proper and karelianite occur only in hornfels after volcanic and sedimentary rocks. Xenoliths of hornfels mark the ring faults that bound foidalite within the field of foyaite. Hematite occurs in hydrothermally altered nepheline syenite and crosscutting hydrothermal veins related to the ring faults. Minerals of the ilmenite-pyrophanite series are present in all rocks of the pluton, including veins. Accessory ilmenite in foyaite varies from the manganese variety and pyrophanite in the inner and outer parts of the pluton to manganese-free ilmenite in zone of the Main Ring Fault. In xenoliths of volcanic rocks and alkaline ultramafic rocks, ilmenite is enriched in magnesium. The zoning in distribution of the above-mentioned minerals and the character of variation in their compositions from margins of the pluton to its center are consistent with the petrochemical zoning formed as a result of foyaite alteration of near ring faults. 相似文献