排序方式： 共有29条查询结果，搜索用时 15 毫秒
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L. P. Plyusnina G. G. Likhoidov V. P. Molchanov Zh. A. Shcheka 《Russian Journal of Pacific Geology》2007,1(5):464-472
Gold mass transfer with chloride and carbonate-chloride solutions was examined at the 300 and 400°C isotherms and P tot = 1 kbar by means of experimental modeling and theoretical simulations. CO2 was confirmed to suppress Au solubility in fluids. The low Au solubility (mAu < 10?8) determined in the experiments explains the mechanism of its precipitation when serpentinites and listwanites interact with acidic mineralized solutions. Listwanitization, which was genetically related with the emplacement of orogenic granitoids, was determined to have overprinted serpentinites and rodingites and strongly affected Au transport in the oregeochemical system. The characteristics of the metasomatic processes in the Ust’-Dep ophiolites and the gold concentration in the rocks produced by these processes confirm this conclusion. 相似文献
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Doklady Earth Sciences - A new promising source of mineral deposits is found in the southern part of the Far East of Russia: the Ti-bearing intrusions of ultramafic rocks of the Sikhote-Alin... 相似文献
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V. Ya. Molchanov V. M. Lyuty V. F. Esipov S. P. Anikin O. Yu. Makarov N. P. Solodovnikov 《Astronomy Letters》2002,28(10):713-720
We present the results of our tests of an acousto-optical imaging spectrophotometer with a CCD detector for astronomical observations. The tunable acousto-optical filter, based on a paratellurite single crystal with a 13 Å pass band operates in the wavelength range 6300–11000 Å. We obtained image spectra for the planetary nebula NGC 7027 in the Hα line and for Saturn in the methane absorption band, as well as Hα and continuum images for the nuclear region of the Seyfert galaxy NGC 1068. 相似文献
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A. I. Khanchuk Fengyue Sun V. P. Molchanov A. A. Grebennikova A. V. Grebennikov 《Doklady Earth Sciences》2017,473(1):300-302
Native gold, platinum, nickel, and other ore minerals have been discovered in graphite-bearing rocks of the Liumao deposit (Heilongjiang province, China). The results obtained are similar to the previously published materials on the mineralogy of carbon-rich formations of the Tamga and Turgenevo deposits (Primorye, Russian Far East) located in the same region of graphitization in the Khankai terrane as the Chinese object. The defined similarities are most likely explained by participation of deep reduced fluids in the process of ore genesis. 相似文献
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The dispersion of exhaust products of rocket fuel in the direction perpendicular to the motion of a rocket is investigated
in this work. A comparison of the results of numerical calculations with a self-similar approximation of a strong cylindrically
symmetric explosion is fulfilled. It is shown that at sufficiently high rocket velocity V
∞, which exceeds the sum of gas exhaust velocity V
e
from the nozzle and sound speed V
s
(V
∞ > V
e
+V
s
), a gasdynamic hole can arise around the rocket trajectory in the upper atmosphere, inside which the total concentration
of gas becomes less than the equilibrium concentration of gas at a given altitude. The dynamics of the profiles of density
and temperature of the exhaust products inside a rocket plume is calculated. 相似文献
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A. I. Khanchuk L. P. Plyusnina V. P. Molchanov E. I. Medvedev 《Geochemistry International》2010,48(2):107-117
Regional carbonization was examined in Riphean metamorphic complexes in the northern part of the Khanka terrane. The results
obtained by various techniques of physicochemical analysis indicate that all petrographic rock varieties of this complex bear
elevated concentrations (from 10−4 to 10−6 wt %) of Au and PGE. XRF data were used to describe a wide spectrum of trace elements: Ti, V, Ni, Cr, Pt, Pd, Re, Rh, Os,
Ir, Cu, Hg, Au, Ag, Ta, Nb, Sr, Rb, Zr, La, W, Sn, Pb, and Zn. The Rb/Sr-Ba diagram shows the fields of anatectic granite-gneisses,
biotite granites, lamprophyres, graphitized crystalline schists, black shales, skarns, and quartz-graphite metasomatic rocks.
The C isotopic composition in graphite from the metaigneous rocks (lamprophyres and crystalline schists of the amphibolite
facies) corresponds to δ13C from −8.5 to −8.7‰, which suggests that the carbon could be of endogenic provenance. The carbon isotopic composition of
the greenschist-facies black shales corresponds to δ13C from −19.9 to −26.6‰, as is typical of organogenic carbon. The concentrations of precious metals in the rocks are, on average,
one order of magnitude lower than in the graphitized crystalline schists. The origin of the precious-metal ore mineralization
was likely genetically related to the regional carbonization process. 相似文献
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On the contiguous territories of Russia and Chi-na,along the left and right banks of the Amur Riv-er (Heilongjiang Province of China,and Amur Oblast' of Russia),among the Late Mesozoic ter-rigenous and volcano-plutonic formations,several Precambrian prot… 相似文献