Geochemical Features of Cupriferous Sandstones in the Orenburg Area of the Ural Region     

Volkov  A. V.  Novikov  I. A.  Razumovskiy  A. A.  Murashov  K. Yu.  Sidorova  N. V.  Sidorov  A. A. 《Doklady Earth Sciences》2018,479(1):393-396

The new geochemical data obtained of cupriferous sandstones of the Orenburg area of the Ural region show that the Permian host stratum could have served as the source of rare-earth elements and other microelements for the ore-forming fluids. They confirm the possibility of using a convection model to explain the genesis of the copper ores studied. This model indicates the likely multistage development of mineralization to significant depths, like in the Manto deposits in Chili. Consequently, the Permian cupriferous sandstones of the southwestern area of the Ural region can be considered a very promising source of raw material for the development of copper industry in the area.

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Electroconducting Elements of the Ultradeep Fluid–Fault Systems as Indicators of Seismically Active Zones of the Eastern Margin of the Eurasian Continent: Evidence from Magnetotelluric Data     

Nikiforov  V. M.  Shkabarnya  G. N.  Kaplun  V. B.  Zhukovin  A. Yu.  Varentsov  I. M.  Palshin  N. A.  Cuong  D. H.  Trung  N. N.  Hung  D. Q. 《Doklady Earth Sciences》2018,480(2):831-838

Doklady Earth Sciences - A fundamentally new conclusion that zones of high seismic activity are controlled by electroconducting (fluid-saturated) fragments rather than by the entire deep fault is...  相似文献   

Genesis of Diamond in Metal–Carbon and Metal–Sulfur–Carbon Melts: Evidence from Experimental Data     

Zhimulev  E. I.  Chepurov  A. I.  Sobolev  N. V. 《Doklady Earth Sciences》2018,483(1):1473-1474

Doklady Earth Sciences - The experimental data on diamond growth in the Fe–Ni–S–C and Fe–S–C systems with a sulfur content of 5–14 wt % at 5.5 GPa and...  相似文献   

Numerical Simulations of Magnetized Astrophysical Jets and Comparison with Laboratory Laser Experiments     

V. S. Belyaev  G. S. Bisnovatyi-Kogan  A. I. Gromov  B. V. Zagreev  A. V. Lobanov  A. P. Matafonov  S. G. Moiseenko  O. D. Toropina 《Astronomy Reports》2018,62(3):162-182

The results of MHD numerical simulations of the formation and development of magnetized jets are presented. Similarity criteria for comparisons of the results of laboratory laser experiments and numerical simulations of astrophysical jets are discussed. The results of laboratory simulations of jets generated in experiments at the Neodim laser installation are presented.  相似文献   

Flares of the H<Subscript>2</Subscript>O Maser Emission in the Young Stellar Object GH<Subscript>2</Subscript>O 092.67+03.07 (IRAS 21078+5211)     

V. V. Krasnov  E. E. Lekht  V. M. Minnebaev  M. I. Pashchenko  G. M. Rudnitskii  A. M. Tolmachev 《Astronomy Reports》2018,62(3):200-212

The results of monitoring the H₂O maser observed toward the region GH₂O 092.67+03.07 (IRAS 21078+5211) located in the Giant Molecular Cloud Cygnus OB7 are presented. The observations were carried out with the 22-m radio telescope of the Pushchino Radio Astronomy Observatory in 2006–2017. Strong flares of the H₂O maser emission with flux densities up to 19 800 Jy were detected. The flares exhibited both global (over the source) and local characters. All the flares were accompanied by strong variations in the H₂O spectra within the corresponding radial-velocity ranges. Individual H₂O components form both compact clusters and chains 1–2-AU long. Analysis of the variations of the fluxes, radial velocities, and line shapes of features during the flares showed that the medium may be strongly fragmented, with small-scale turbulent motions taking place in the H₂Omaser region.  相似文献   

Spots and the Activity of Stars in the Hyades Cluster from Observations with the Kepler Space Telescope (K2)     

I. S. Savanov  E. S. Dmitrienko 《Astronomy Reports》2018,62(3):238-242

Observations of the K2 mission (continuing the program of the Kepler Space Telescope) are used to estimate the spot coverage S (the fractional area of spots on the surface of an active star) for stars of the Hyades cluster. The analysis is based on data on the photometric variations of 47 confirmed single cluster members, together with their atmospheric parameters, masses, and rotation periods. The resulting values of S for these Hyades objects are lower than those stars of the Pleiades cluster (on average, by ΔS ~ 0.05?0.06). A comparison of the results of studies of cool, low-mass dwarfs in the Hyades and Pleiades clusters, as well as the results of a study of 1570 M stars from the main field observed in the Kepler SpaceMission, indicates that the Hyades stars are more evolved than the Pleiades stars, and demonstrate lower activity. The activity of seven solar-type Hyades stars (S = 0.013 ± 0.006) almost approaches the activity level of the present-day Sun, and is lower than the activity of solar-mass stars in the Pleiades (S = 0.031 ± 0.003). Solar-type stars in the Hyades rotate faster than the Sun (〈P〉 = 8.6 ^d ), but slower than similar Pleiades stars.  相似文献   

Results of magnetotelluric surveyon reference geophysical profiles of the Karaton-Sarkamys block in Kazakhstan     

G.K. Umirova  S.A. Istekova  I.N. Modin 《Russian Geology and Geophysics》2018,59(1):96-104

A digital geoelectric model of the Karaton-Sarkamys block located in the southern (Kazakhstan) part of the Caspian Depression has been developed on the basis of processing and interpretation of magnetotelluric sounding data. Geoelectric sections and structural maps of geoelectric layers have been constructed. It has been shown that magnetotelluric sounding combined with seismic and GIS data can be efficiently used to obtain additional information on the lithologic and reservoir properties of petroleum plays.  相似文献   

Climatic Changes in the Dynamic Topography and Geostrophic Circulation of the Arctic Ocean     

Timokhov  L. A.  Ivanov  V. V.  Kassens  H.  Lebedev  N. V.  Frolov  I. Ye.  Hölemann  J. 《Doklady Earth Sciences》2018,480(1):685-688

Doklady Earth Sciences - According to historical oceanographic data, anomalies in the dynamic topography during the winter period were calculated and two climatic stages of dynamic condition of the...  相似文献   

Paleoearthquakes in the Uimon basin (Gorny Altai)     

E.V. Deev  I.D. Zol’nikov  I.V. Turova  G.G. Rusanov  Yu.M. Ryapolova  N.N. Nevedrova  S.A. Kotler 《Russian Geology and Geophysics》2018,59(4):351-362

Paleoseismological studies confirm that the Uimon basin is thrust by its northern mountain border along the active South Terekta fault. The latest motion along the fault in the 7-8th centuries AD induced an earthquake with a magnitude of M_w= 7.4-7.7 and a shaking intensity of I = 9-11 on the MSK-64 scale. The same fault generated another event (M > 7, I = 9-10), possibly, about 16 kyr ago, which triggered gravity sliding. The rockslide dammed the Uimon valley and produced a lake, where lacustrine deposition began about 14 ± 1 kyr ago, and a later M > 7 (I = 9-10) earthquake at ~ 6 ka caused the dam collapse and the lake drainage. Traces of much older earthquakes that occurred within the Uimon basin are detectable from secondary deformation structures (seismites) in soft sediments deposited during the drainage of a Late Pleistocene ice-dammed lake between 100 and 90 ka and in ~ 77 ka alluvium. The magnitude and intensity of these paleoearthquakes were at least M > 5.0-5.5 and I > 6-7.  相似文献   

Morphological Features of Diamond Crystals Dissolved in Fe<Subscript>0.7</Subscript>S<Subscript>0.3</Subscript> Melt at 4 GPa and 1400°C     

V.?M.?SoninEmail author  E.?I.?Zhimulev  B.?S.?Pomazanskiy  A.?L.?Zemnuhov  A.?A.?Chepurov  V.?P.?Afanasiev  A.?I.?Chepurov 《Geology of Ore Deposits》2018,60(1):82-92

An experimental study of the dissolution of natural and synthetic diamonds in a sulfur-bearing iron melt (Fe_0.7S_0.3) with high P–T parameters (4 GPa, 1400°С) was performed. The results demonstrated that under these conditions, octahedral crystals with flat faces and rounded tetrahexahedral diamond crystals are transformed into rounded octahedroids, which have morphological characteristics similar to those of natural diamonds from kimberlite. It was suggested that, taking into account the complex history of individual natural diamond crystals, including the dissolution stages, sulfur-bearing metal melts up to sulfide melts were not only diamond-forming media during the early evolution of the Earth, but also natural solvents of diamond in the mantle environment before the formation of kimberlitic melts.  相似文献