Accessory iron and nickel minerals from the Mt. Poputnaya ultramafic massif,eastern Kamchatka,Russia

Oxides, sulfides, arsenides, native metals, and intermetallic compounds are accessory ore minerals from the rocks of the Mt. Poputnaya ultramafic massif. The Fe–Ni phases containing 55.3–82.3 wt % Ni are the most abundant among them. Magnetite, pyrrhotite, Co–Fe and Fe–Ni phases, and native iron are the comparatively high-temperature minerals, whereas heazlewoodite, orcelite, dienerite, and native copper are formed at low temperatures. The found minerals result from serpentinization at 500°C and below.     

Geochemical features of gold–quartz veins in granitoid intrusives and terrigenous masses of the Yana–Kolyma folded belt in the northeast of Russia

The main task of this study was to reveal geochemical and distinctive features of gold–quartz vein ores of deposits in granitoid intrusive bodies and in terrigenous black-schist masses of the Yana-Kolyma folded belt. The results obtained point to the significant role of metamorphism of the enclosing terrigenous carbonaceous masses in ore formation of both types of deposits. The established facts are not contradictory to the metamorphic–magmagene model of the formation of gold deposits in the Yana–Kolyma belt. The geochemical similarity of both types of deposits shows that these are products of the same orogenic system, which confirms the validity of combining these deposits to form a unified gold–quartz formation.     

Associations of Meteor Microshowers or as the Kazan Radar “SEES” Radiants on Northern Celestial Hemisphere

The discrete quasitomographic method of the analysis of the interferometric data of meteor radar gives us the possibility of measuring coordinates and velocities of very weak meteor showers with a 2 × 2 square degree resolution on the celestial sphere. The minimal rate of the meteors in each microstream is five meteors per day. At such sensitivity, basic distinctions between irregularities of the sporadic background and meteor streams vanish. More than 1000 of the detected microshowers per month are associated with a combination of (a) the large known meteor showers, (b) the weaker known meteor showers and (c) till now unknown associations of microshowers. All microshowers regardless of association have the identical velocities, limited areas of radiation and near simultaneity of their acting dates. The results are compiled as maps of radiant distribution and average velocities of microstreams for different months. From these it is possible to see how the microshower activity for various discrete sites on the celestial sphere correlate with the behavior of the well-known meteor streams and thus to infer the orbital properties of the different microstream configurations.