Lanthanides in fluid inclusions, quartz, and greenschists from auriferous and barren quartz-vein zones of the Sovetskoe quartz-gold deposit, Yenisei Range, Russia     

A. A. Tomilenko  N. A. Gibsher  O. A. Koz’menko  S. V. Palesskii  I. V. Nikolaeva 《Geochemistry International》2008,46(4):402-408

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Does magnetic storm generation depend on the solar wind type?     

N.?S.?Nikolaeva  Yu.?I.?YermolaevEmail author  I.?G.?Lodkina  M.?Yu.?Yermolaev 《Geomagnetism and Aeronomy》2017,57(5):512-518

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The Effect of Environmental Factors on the Cognitive Functions of Cadets at a Military Institute     

Pavlov  K. I.  Syrtsev  A. V.  Mukhin  V. N.  Archimuk  A. N.  Mikheeva  E. A.  Nikolaeva  S. V.  Andieva  N. M.  Kamenskaya  V. G.  Petrenko  M. I. 《Izvestiya Atmospheric and Oceanic Physics》2019,55(10):1465-1487

Izvestiya, Atmospheric and Oceanic Physics - The relevance of studying the influence of environmental factors on the psychophysiological characteristics of cognitive functions of cadets at a naval...  相似文献   

Broadband Spectrum of the X-ray Binary M33 X-6 from NuSTAR and Swift–XRT Data: An Extragalactic Z-Source?     

S. M. Nikolaeva  R. A. Krivonos  S. Yu. Sazonov 《Astronomy Letters》2018,44(10):593-602

We present the results of our study of the X-ray spectrum for the source X-6 in the nearby galaxy M33 obtained for the first time at energies above 10 keV from the data of the NuSTAR orbital telescope. The archival Swift–XRT data for energy coverage below 3 keV have been used, which has allowed the spectrum of M33 X-6 to be constructed in the wide energy range 0.3–20 keV. The spectrum of the source is well described by the model of an optically and geometrically thick accretion disk with a maximum temperature of ~2 keV and an inner radius of ~5 cos^?1/2θ km (where >θ is the unknown disk inclination angle with respect to the observer). There is also evidence for the presence of an additional hard component in the spectrum. The X-ray luminosity ofM33 X-6 measured for the first time in the wide energy range 0.3–20 keV is ~2 × 10³⁸ erg s^?1, with the luminosity in the hard 10–20 keV X-ray band being ~10% of the source’s total luminosity. The results obtained suggest that X-6 may be a Z-source, i.e., an X-ray binary with subcritical accretion onto a weakly magnetized neutron star.  相似文献   

Residence of incompatible trace elements in a large spinel lherzolite xenolith from alkali basalt of Shavaryn Tsaram-1 paleovolcano (western Mongolia)     

F.P. Lesnov  O.A. Koz'menko  I.V. Nikolaeva  S.V. Palesskii 《Russian Geology and Geophysics》2009,50(12):1063-1072

We have studied a large (12 × 22 × 30 cm) spinel lherzolite xenolith with undeformed margins in alkali basalt (basanite) from the eroded crater of Late Cenozoic Shavaryn Tsaram-1 volcano in western Mongolia. The xenolith was sampled along its median transversal profile, at every 15–20 mm for bulk chemistry of lherzolite and basalt (ICP-MS) and at 4–10 mm for the chemistry of olivine, orthopyroxene, clinopyroxene, and Cr-spinel minerals, and of material filling cracks (LA ICP-MS). Incompatible elements (especially, LREE) are distributed unevenly over the xenolith, both in lherzolite and in its constituent minerals, as well as in crack-filling material, with abnormal LREE enrichment in some specimens. Judging by the measured trace-element spectra compared with the model patterns, incompatible elements reside in different amounts as interstitial impurity in cracks inside and between mineral grains in lherzolite, also being a substitutional impurity in the lherzolite constituent minerals. Experimental acid leaching of specimens from sites of high crack density showed (La/Yb)_n ratios in the crack fill to be much higher than in the basalt host and more so in bulk lherzolite (180 against 33 and 1.5–3.6, respectively). The proportional contents of P and Ca in the leaching solution, especially in that from the xenolith’s center mark the presence of an apatite microphase, which can be a LREE repository.The observed patterns of LREE and other incompatible elements in the xenolith and in the host alkali basalt fit a model implying that mobile elements residing as interstitial impurity came with fluids which were released from rising basaltic magma and percolated into the xenolith along cracks.  相似文献   

Crystallization conditions of the alkaline-basic dike from the Yllymakh Massif,Central Aldan: Evidence from melt inclusion data in minerals     

L. I. Panina  A. T. Nikolaeva  E. Yu. Rokosova 《Geochemistry International》2011,49(2):120-138

Alkaline-basic dike from the Yllymakh Massif (Central Aldan) has been studied. Its partially crystallized matrix contains corroded phenocrysts of olivine and hypidiomorphic phenocrysts of clinopyroxene and pseudo-, epileucite. It was found that phenocrysts of clinopyroxene contain abundant primary inclusions, Ti-magnetite and apatite bear only single inclusions, whereas olivine is enriched in secondary inclusions, which are confined to the cleavage of host mineral (along second and third pinacoids) and its cracks. The homogenization temperatures of the primary inclusions in clinopyroxene and secondary inclusions in olivine are approximately equal and lie within 1260–1240°C. The compositions of melt inclusions in olivine and clinopyroxene are also similar and corresponded to the malignite-pseudoleucite phonolite-monzonite pulaskites, which are developed at the Yllymakh Massif. Unheated inclusions in apatite and Ti-magnetite compositionally approach monzonites and nepheline syenites—tinguaites, respectively. It was concluded that the alkaline basaltoid magma was presumably parental magma for the entire rock complex of the Yllymakh Massif. Its crystallization and differentiation presumably provided all observed rock variety from ultrabasics (early derivatives located at depth) and malignites (later derivatives) to leucite phonolites, monzonites, and alkaline pulaskites, which were obtained during subsequent stages of the melt evolution. The parental magma, and especially its derivatives, were enriched in BaO (0.8–0.1 wt %), Cl (0.1–0.3 wt %) and trace elements (primarily, LREE and MREE), which are several times higher than mantle values. At the same time, ion microprobe (SIMS) study showed that derivative melts were dry: contained only 0.01–1.13 wt % H₂O. The trend of melts conserved in the minerals and the massif rocks corresponds to the evolution of alkalinebasaltoid magma with increase in Si, Al, alkalis and decrease in Mg, Ca, and Fe, i.e. the Bowen trend. The considered alkaline-basic dike was presumably formed from the derivative of leucite-phonolite melt, which during emplacement captured olivine xenocrysts from previously fractionated ultrabasic rocks. The parental magma was presumably derived by high-degree melting of garnet-spinel-facies depleted mantle at some influence of crustal material.  相似文献   

Numerical investigation of deep water circulation in the Faroese Channels     

Nataliya Stashchuk  Vasiliy VlasenkoToby J. Sherwin 《Deep Sea Research Part I: Oceanographic Research Papers》2011,58(7):787-799

The overflow of dense water from the Nordic Seas through the Faroese Channels is investigated numerically using the Massachusetts Institute of Technology General Circulation Model. The model is forced by the removal of a barrier that separates different water masses in the bottom layer of the Faroe-Shetland Channel at the north-eastern boundary. An analysis of the output reveals that during its adjustment in the rotating channel the propagating flow is unstable and forms cyclonic and anti-cyclonic eddies in the Faroese Channels. The life-time of the cyclonic eddy is about 10 days, but an anti-cyclonic eddy that is formed upstream of the sill crest of the Faroe Bank Channel has a longer life-time. However, after 50 days it eventually loses its structure below 400 m due to the decay of a counter-rotating current. In the upper 400 m layer this anti-cyclonic eddy remains persistent for longer. Observational evidence of the eddy is confirmed by the tracks of experimental drifters released in the area and by the temperature and salinity fields observed in the Faroese Channels.The pinching of isotherms along the Wyville Thomson Ridge results in the concentration of cold water on the southern side of the Faroese Channels that overflows into the Rockall Trough. The model results demonstrate that the main part of the cold water outflows through the Faroe Bank Channel, rather than across the Wyville Thompson Ridge, due to Earth rotation. The apparent similarity of modelled temperature, salinity and velocity sections to recent measurements in this area adds confidence to these results.  相似文献   

Modeling of the Orbital Evolution of 2060 Chiron     

Nataliya S. Kovalenko  Yury G. Babenko  Klim I. Churyumov 《Earth, Moon, and Planets》2002,90(1-4):489-494

The origin of Centaurs is one of the most interesting problems of Solarsystem science, and it has not yet been solved. To shed light onthis problem one can investigate Centaurs' past and future orbitalevolution. In this paper we discuss the results of Chiron's orbitalevolution modeling. It was the first discovered Centaur and is thebrightest one. Numerical integration was produced for 1 Myrforward and backward from the present time. A program based on theEverhart single sequence method for integrating orbits was used.  相似文献   

Paleoseismic Events Reflected in Late Pleistocene and Holocene Deposits of the Terraces of Imandra Lake (Kola Region,Fennoscandian Shield)     

Nikolaeva  S. B. 《Doklady Earth Sciences》2022,506(1):S108-S115

Doklady Earth Sciences - Soft-sediment deformation structures have been identified in glaciolacustrine deposits of the terrace complexes of Imandra Lake (Kola Region, northeastern part of the...  相似文献   

Engineering and Ecological Geology at Moscow State University in the 2008–2017 Period (to the 80th Anniversary of the Chair of Engineering and Ecological Geology)     

V. T. Trofimov  S. D. Balykova  S. K. Nikolaeva 《Moscow University Geology Bulletin》2018,73(1):1-12

The results of scientific and educational activities of the Chair of Engineering and Ecological Geology in the 2008—2017 period, its structure, scientific and organizing activities, as well as information about state and public recognition of the Chair’s staff works are characterized.  相似文献