Mineralogy, geochemistry and stratigraphy of the Maslovsky Pt–Cu–Ni sulfide deposit, Noril’sk Region, Russia     

Nadezhda Alexandrovna Krivolutskaya  Alexandr Vladimirovich Sobolev  Sergey Grigor’evich Snisar  Bronislav Iosiphovich Gongalskiy  Dmitry Vladimirovich Kuzmin  Folkmar Hauff  Irina Nikolaevna Tushentsova  Natalya Mikhailovna Svirskaya  Natalya Nikolaevna Kononkova  Tatyana B. Schlychkova 《Mineralium Deposita》2012,47(1-2):69-88

We report new data on the stratigraphy, mineralogy and geochemistry of the rocks and ores of the Maslovsky Pt–Cu–Ni sulfide deposit which is thought to be the southwestern extension of the Noril’sk 1 intrusion. Variations in the Ta/Nb ratio of the gabbro-dolerites hosting the sulfide mineralization and the compositions of their pyroxene and olivine indicate that these rocks were produced by two discrete magmatic pulses, which gave rise to the Northern and Southern Maslovsky intrusions that together host the Maslovsky deposit. The Northern intrusion is located inside the Tungusska sandstones and basalt of the Ivakinsky Formation. The Southern intrusion cuts through all of the lower units of the Siberian Trap tuff-lavas, including the Lower Nadezhdinsky Formation; demonstrating that the ore-bearing intrusions of the Noril’sk Complex post-date that unit. Rocks in both intrusions have low TiO₂ and elevated MgO contents (average mean TiO₂ <1 and MgO?=?12?wt.%) that are more primitive than the lavas of the Upper Formations of the Siberian Traps which suggests that the ore-bearing intrusions result from a separate magmatic event. Unusually high concentrations of both HREE (Dy+Yb+Er+Lu) and Y (up to 1.2 and 2.1?ppm, respectively) occur in olivines (Fo_79.5 and 0.25% NiO) from picritic and taxitic gabbro-dolerites with disseminated sulfide mineralization. Thus accumulation of HREE, Y and Ni in the melts is correlated with the mineral potential of the intrusions. The TiO₂ concentration in pyroxene has a strong negative correlation with the Mg# of both host mineral and Mg# of host rock. Sulfides from the Northern Maslovsky intrusion are predominantly chalcopyrite–pyrrhotite–pentlandite with subordinate and minor amounts of cubanite, bornite and millerite and a diverse assemblage of rare precious metal minerals including native metals (Au, Ag and Pd), Sn–Pd–Pt–Bi–Pb compounds and Fe–Pt alloys. Sulfides from the Southern Maslovsky intrusion have δ ³⁴S?=?5–6‰ up to 10.8‰ in two samples whereas the country rock basalt have δ ³⁴S?=?3–4‰, implying there was no in situ assimilation of surrounding rocks by magmas.  相似文献   

Evidence for Late Riphean granite formation in the Polar Urals     

A. A. Soboleva  A. F. Karchevskii  L. I. Efanova  N. B. Kuznetsov  M. Grove  I. D. Sobolev  M. V. Maurin 《Doklady Earth Sciences》2012,442(2):181-187

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Conditions of formation of Cr-pyrope and escolaite during mantle metasomatism: Experimental modeling     

Yu. V. Bataleva  Yu. N. Pal’yanov  A. G. Sokol  Yu. M. Borzdov  N. V. Sobolev 《Doklady Earth Sciences》2012,442(1):76-80

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Minor elements in unusual olivines from high-pressure peridotites of the kokchetav massif (Northern Kazakhstan)     

A. Yu. Selyatitskii  V. V. Reverdatto  D. V. Kuz’min  N. V. Sobolev 《Doklady Earth Sciences》2012,445(2):1015-1020

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Orbital and physical parameters of the spectroscopic binary HD37737     

S. A. Alexeeva  A. M. Sobolev  S. Yu. Gorda  M. V. Yushkin  V. McSwain 《Astrophysical Bulletin》2013,68(2):169-176

We report the physical and orbital parameters of the visible component of the spectroscopic binary HD37737 (m _V = 8.03). The observations were performed with the 1.2-m telescope of the Kourovka Astronomical Observatory of the Ural Federal University in 2012 and the 6-m BTA telescope of the SAO RAS in 2007 and 2009. Radial velocities were measured separately from each spectral line of the list by the cross-correlation method with a synthetic spectrum. The latter was calculated using the grids of non-LTE model atmospheres with solar chemical compositions. A significant difference in the epochs of observations (2005–2012) allowed to refine the orbital period of the star (7 _· ^d 84705) and the orbital elements of the binary system. We obtained an estimate of the mass function f(m) = 0.23 ± 0.02M _⊙. The best agreement between the synthetic and observed spectra is achieved at T _eff = 30 000 K and log g = 3.50 according to the observations on both instruments. The obtained parameters correspond to a star of spectral type O9.5 III, with mass estimated at 26 ± 2M _⊙. The minimum mass estimate of the secondary component of the binary is 6.2 ± 0.5M _⊙. We have discovered a fact that the velocities, obtained from different spectral lines, differ, which is typical for giant stars. Engaging additional spectra, obtained in 2005 with the 2.1-m KPNO telescope, we investigated the effect of this fact on the estimate of the speed of the system’s center of mass. The difference in the velocities of various lines is approximately the same in the spectra, obtained at all the three instruments. The obtained ratios suggest that the deeper layers of the atmosphere of the star are moving with a greater velocity than the outer layers. Depending on the line, the estimate of the heliocentric velocity of the binary’s center of mass varies in the range from ?11 to 1 km/s.  相似文献   

Photoluminescence of optical chemosensory films based on mesoporous silica modified by a complex colloidal silver-organic dye     

D. V. Kalinin  V. V. Serdobintseva  N. V. Sobolev 《Doklady Earth Sciences》2010,434(2):1351-1353

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The Preparation and Preliminary Characterisation of Eight Geological MPI-DING Reference Glasses for In-Situ Microanalysis   总被引：13，自引：4，他引：9  

Klaus Peter Jochum  Donald B. Dingwell  Alexander Rocholl  Brigitte Stoll  Albrecht W. Hofmann  S. Becker  A. Besmehn  D. Bessette  H.-J. Dietze  P. Dulski  J. Erzinger  E. Hellebrand  P. Hoppe  I. Horn  K. Janssens  G.A. Jenner  M. Klein  W.F. McDonough  M. Maetz  K. Mezger  C. Müker  I.K. Nikogosian  C. Pickhardt  I. Raczek  D. Rhede  H.M. Seufert  S.G. Simakin  A.V. Sobolev  B. Spettel  S. Straub  L. Vincze  A. Wallianos  G. Weckwerth  S. Weyer  D. Wolf  M. Zimmer 《Geostandards and Geoanalytical Research》2000,24(1):87-133

Eight silicate glasses were prepared by directly fusing and stirring 50-100 g each of basalt, andesite, komatiite, peridotite, rhyolite, and quartz-diorite. These are referred to as MPI-DING glasses and were made for the purpose of providing reference materials for geochemical, in-situ microanalytical work. Results from various analytical techniques indicate that individual glass fragments are well homogenised with respect to major and trace elements at the μm to mm scale. Heterogeneities due to quench crystallisation of olivine have been observed in small and limited areas of the two komatiitic glasses. In order to obtain concentration values for as many elements as possible, the glasses were analysed by a variety of bulk and microanalytical methods in a number of laboratories. The analytical uncertainties of most elements are estimated to be between 1% and 10%. From the analytical data, preliminary reference values for more than sixty elements were calculated. The analytical uncertainties of most elements are estimated to be between 1% and 10%.  相似文献