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1.
M. I. Kuz’min Yu. P. Troshin S. M. Boiko E. A. Razvozzhaeva L. D. Zorina D. Kh. Martikhaeva 《Geology of Ore Deposits》2010,52(3):252-259
The carbonaceous matter filling cavities in sulfide-quartz veins at the Kurultyken hydrothermal base-metal deposit in the
Khapcheranga ore district, Transbaikal region, was studied using chromatography/mass spectrometry, X-ray diffraction, thermal
and isotopic analyses, and IR spectroscopy. It was established that carbonaceous matter was a maltha composed of polycyclic
aromatic hydrocarbons (PAHs). Chrysene, pyrene, and benzpyrelene identified among PAHs are evidence for the hydrothermal origin
of the initial carbonaceous matter of maltha. The main mass of carbonaceous matter was synthesized under reductive conditions
and at a low temperature, i.e., at the final stage of base-metal ore formation. Nevertheless, the thermometric data indicate
that part of the carbonic compounds could have formed at 480°C, i.e., at the high-temperature stage of the postmagmatic process.
The contribution of host rocks as a source of carbonaceous matter was minimal. 相似文献
2.
Sobolev G. A. Zakrzhevskaya N. A. Migunov I. N. Sobolev D. G. Boiko A. N. 《Izvestiya Physics of the Solid Earth》2020,56(3):291-315
Izvestiya, Physics of the Solid Earth - Abstract—The response of seismic noise in the minute range of periods to the strong magnetic storms is studied. The noise is analyzed from the records... 相似文献
3.
New results of the numerical modeling of the response of the outer atmosphere of the Sun to an impulsive heating are presented.
Features of the general process are considered both for powerful and weak solar flares. For the most powerful flares it is
necessary to take into account the effect of a saturation of the heat flow. Though for the most powerful solar flares the
saturation of a thermal flow is not such large, the influence of this effect is important for cases of powerful flares on
red dwarf stars, strongly limiting the input of the thermal energy downwards. The response of the atmosphere, which consists
of the chromosphere, the transition region and the corona, to weak heating is characterized by creation no one as usually
but two ascending coronal flows. The occurrence of the additional flow at coronal heights is caused by the inhomogeneous initial
heating of the outer atmosphere. Some types of soft X-ray and UV-jets can be associated with such additional flow.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
4.
V. Yu. Timofeev P. Yu. Gornov D. G. Ardyukov Yu. F. Malyshev E. V. Boiko 《Russian Journal of Pacific Geology》2008,2(4):314-324
This paper considers results of geodynamic studies using the GPS method in the territory of the Far East. GPS measurements using TRIMBLE-4700 geophones were launched along the Sikhote Alin profile in 2003. The technology of the GPS measurements and the problems of selecting the measurement sites and network configuration with reference to the region’s structure are discussed. The results of GPS measurements in 2003–2006 were used to study the fault system of the Far East continental margin. Different models of the Eurasia rotation (from the known NNR-NUVEL-1A to the recent ones) were analyzed. The solid-body rotation of Eurasia was predicted in the framework of the AR-IR-2006 model with a pole located at 51.045°N latitude, 255.842° longitude and rotating at a rate of 0.2423°/Ma. The parameters of the Amur plate rotation were preliminarily estimated (57.6° ± 0.5°N, 117.1 ± 0.5°E, and 0.083° ± 0.004°/m.y) using results on the Sikhote Alin and Transbaikalian network. 相似文献
5.
V. Yu. Timofeev E. N. Kalish Yu. F. Stus’ D. G. Ardyukov M. G. Valitov A. V. Timofeev D. A. Nosov I. S. Sizikov E. V. Boiko P. Yu. Gornov R. G. Kulinich T. N. Kolpashchikova Z. N. Proshkina E. O. Nazarov V. G. Kolmogorov 《Izvestiya Physics of the Solid Earth》2018,54(3):430-443
The modern gravimetry methods are capable of measuring gravity with an accuracy of up to 10–10 of the normal value, which is commensurate with the accuracy of the up-to-date methods of displacement measurements by satellite geodesy. Significant changes, e.g., in the coseismic displacements of the Earth’s surface are recorded in the zones of large earthquakes. These changes should manifest themselves in the variations of gravity. Absolute measurements have been conducted by various modifications of absolute ballistic gravimeters GABL since the mid-1970s at the Klyuchi point (Novosibirsk) in the south of the West Siberian plate. Monitoring observations have been taking place in the seismically active regions since the 1990s. In this paper we consider the results of the long-term measurements of the variations in gravity and recent crustal displacements for different types of earthquakes (the zones of shear, extension, and compression). In the seismically active areas in the east of Russia, the longest annual series of absolute measurements starting from 1992 was recorded in the southeastern segment of Baikal region. In this area, the Kultuk earthquake with magnitude 6.5 occurred on August 27, 2008, at a distance of 25 km from the observation point of the Talaya seismic station. The measurements in Gornyi (Mountainous) Altai have been conducted since 2000. A strikeslip earthquake with magnitude 7.5 took place in the southern segment of the region on September 27, 2003. The effects of the catastrophic M = 9.0 Tohoku, Japan, earthquake of March 11, 2011 were identified in Primor’e in the far zone of the event. The empirical data are consistent with the results of modeling based on the seismological data. The coseismic variations in gravity are caused by the combined effect of the changes in the elevation of the observation point and crustal deformation. 相似文献
6.
A. A. Schreider Al. A. Schreider A. N. Boiko J. Galindo-Zaldivar A. Maldonado E. I. Evsenko 《Oceanology》2011,51(1):170-182
The first map of the acoustic basement and a new map of the C4-C12 chrons are made for the area of the paleospreading West Scotia Ridge. The analysis of the constructed maps and the calculations
showed that the bottom growth in the ridge axes began in the southeast in the interval of chron C12r (31.116–33.266 Ma B.P.). In the period of chron C11r (30.217–30.627 Ma), a hundred-kilometer northwestward jump of the spreading
axis occurred. The maximal values of the bottom growth (about 6.3 cm/yr) were in the interval of chrons C6–C6B (18.748–22.546
Ma); then, the spreading began to fade. In the time of chron C3n.1r (3.300–4.493 Ma B.P.), the axis of the paleo-mid-oceanic
ridge died. The spreading was accompanied with northeastward propagating of the axes, and the propagating proper had an impulse
character. 相似文献
7.
Al. A. Schreider A. A. Schreider A. N. Boiko G. L. Kashintsev E. I. Evsenko 《Oceanology》2011,51(4):662-676
The geometry of the junction between Ceylon and Antarctica during the Gondwanaland breakup is still under discussion. Analysis
of the available geological-geophysical materials has allowed the peculiarities of Ceylon separation from Antarctica to be
characterized, the new paleogeodynamical reconstruction to be elaborated, and a prognosis of the tectonic structure and mineral
resources in the areas of Antarctic coast that were adjacent to Ceylon to be made. 相似文献
8.
Association of titanium-zirconium placers and phosphate mineralization in Upper Cretaceous rocks of the East European Platform
is shown with the Tsentral’noe (Central) and Unecha deposits as example. This paragenesis is caused by interaction between
the multicomponent placer ore (phosphate-rare metal) concentrations and mechanical-chemical differentiation that shows up
periodically during the sub-aerial migration of sedimentary material. Clastic ore components were mainly derived from intermediate
collectors, while the phosphate material was delivered by the phosphate-containing solutions and particulates in the chemical
weathering crust. Such phosphorite-titanium-zirconium occurrences can also be detected in other regions, including areas with
rare metal placers. 相似文献
9.
N. N. Kulikova E. V. Saibatalova S. M. Boiko N. A. Semiturkina O. Yu. Belozerova A. S. Mekhonoshin O. A. Timoshkin A. N. Suturin 《Geochemistry International》2013,51(4):326-337
ICP-MS analyses of encrusting sponges indicate that their predominant chemical elements are, along with Si, by P, Al, Fe, Ca, S, Mg, K, Na, Cu, Mn, Zn, Ti, Ba, and Br. The sponges are most significantly enriched in Al > Cu > Ti > REE > Mn > P relative to their aqueous habitat and in Cu > I > Cd > P > Br > As ≥ S relative to the relatively rudaceous bottom sediments. One of the sources of elements occurring the aqueous habitat and being of vital importance for the activity of the sponges was proved to be the rock substrates. 相似文献
10.
The one-dimensional (1D) problem of magma rising through a volcanic channel is identical in its statement to the problem of chemical-density or thermo-chemical convection in an unbounded medium. The present work demonstrates how the rise of a low-viscous, buoyant material through an ambient environment with significantly higher viscosity can be successively described as a 1D problem of viscous fluid dynamics. The suggested analytical model is applied to describe the upwelling of a less dense material in the tail of a diapir through the mantle to the Earth??s surface. The linear study of wave disturbances in the shape of the conduit shows that the buoyant material tends to uprise by portions, which probably accounts for the pulsed activity of the hotspots appearing on the surface above the diapir. 相似文献