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121.
Skublov S. G. Bushmin S. A. Kuznetsov A. B. Li X.-H. Li Q.-L. Levashova E. V. Savva E. V. 《Doklady Earth Sciences》2020,491(2):247-252
Doklady Earth Sciences - For the first time, the isotopic composition of oxygen, the content of trace elements, and the U–Pb zircon age were determined for kyanite–gedrite metasomatites... 相似文献
122.
Krasotkina A. O. Skublov S. G. Kuznetsov A. B. Makeyev A. B. Astafjev B. Yu. Voinova O. A. 《Doklady Earth Sciences》2020,495(2):872-879
Doklady Earth Sciences - Isotope–geochemical study of zircon from leucoxene–quartz sandstone of the Yarega deposit in South Timan was conducted for the first time using the Sensitive... 相似文献
123.
Doklady Earth Sciences - The exsolution texture of the Au–Ag–Cu–Pt solid solution is represented by numerous lamellae of cupreous gold in the Ag–Au–Pd matrix. On... 相似文献
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V. M. Lipunov V. G. Kornilov A. V. Krylov N. V. Tyurina A. A. Belinskii E. S. Gorbovskoi D. A. Kuvshinov P. A. Gritsyk G. A. Antipov G. V. Borisov A. V. Sankovich V. V. Vladimirov V. I. Vybornov A. S. Kuznetsov 《Astronomy Reports》2007,51(12):1004-1025
We present the results of observations obtained using the MASTER robotic telescope in 2005–2006, including the earliest observations of the optical emission of the gamma-ray bursts GRB 050824 and GRB 060926. Together with later observations, these data yield the brightness-variation law t ?0.55±0.05 for GRB 050824. An optical flare was detected in GRB 060926—a brightness enhancement that repeated the behavior observed in the X-ray variations. The spectrum of GRB 060926 is found to be F E ~ E ?β , where β = 1.0 ± 0.2. Limits on the optical brightnesses of 26 gamma-ray bursts have been derived, 9 of these for the first time. Data for more than 90% of the accessible sky down to 19 m were taken and reduced in real time during the survey. A database has been composed based on these data. Limits have been placed on the rate of optical flares that are not associated with detected gamma-ray bursts, and on the opening angle for the beams of gamma-ray bursts. Three new supernovae have been discovered: SN 2005bv (type Ia)—the first to be discovered on Russian territory, SN 2005ee—one of the most powerful type II supernovae known, and SN 2006ak (type Ia). We have obtained an image of SN 2006X during the growth stage and a light curve that fully describes the brightness maximum and exponential decay. A new method for searching for optical transients of gamma-ray bursts detected using triangulation from various spacecraft is proposed and tested. 相似文献
128.
Thermal expansion of ZnSiO3 high-pressure clinopyroxene and ilmenite phases was measured in the temperature range 100–620 K by the X-ray powder diffraction
method. Interpolation and extrapolation of experimental data were performed by the procedure based on the Debye-Mie-Gruneisen
theory in the range from 50 to 1,500 K. Temperature dependencies of molar volumes and coefficients of bulk thermal expansion
of ZnSiO3 phases were determined. 相似文献
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A. B. Kuznetsov I. M. Gorokhov G. V. Ovchinnikova V. A. Melezhik I. M. Vasil’eva B. M. Gorokhovskii G. V. Konstantinova N. N. Mel’nikov 《Lithology and Mineral Resources》2011,46(2):151-164
The Rb-Sr and U-Pb systematics have been studied in the metasedimentary carbonate rocks from the Paleoproterozoic Kuetsjarvi
Formation. Samples were taken from the borehole drilled in the northern zone of the Pechenga Greenstone Belt in the northwestern
Kola Peninsula. The carbonate section of the formation is made up of three units (from the bottom to top): (I) dolomite (68
m), (II) calcareous-dolomite (9 m), and (III) clayey calcareous (1 m) ones. Dolomites (Mg/Ca = 0.55–0.61) from the lowermost
unit I contain 70.3–111 ppm Sr. Initial 87Sr/86Sr ratio in them varies within 0.70560–0.70623 and characterizes the primary continental-lacustrine carbonate sediments. Calcareous
dolomites (Mg/Ca = 0.39–0.59) and dolomitic limestones of units II and III (Mg/Ca = 0.02–0.36) are enriched in Sr (285–745
and 550–1750 ppm, respectively). Initial 87Sr/86Sr ratios in these rocks (0.70406–0.70486 and 0.70407–0.70431, respectively) fall within the range typical of the Jatulian
seawater, which indicates that the carbonate sediments of two upper units were formed in an open marine basin. Study of dolomites
from unit I showed that the Svecofennian metamorphism more significantly affected the U-Pb systems of carbonate rocks as compared
to their Rb-Sr systems. In the 207Pb/204Pb-206Pb/204Pb diagram, most data points corresponding to the carbonate constituent of dolomites define isochron with an age of 1900 ±
25 Ma (MSWD = 0.5). The same samples define a positive correlation in the 208Pb/204Pb-206Pb/204Pb plot. Since sedimentary carbonates usually do not contain Th, this correlation points to secondary enrichment of the studied
dolomites in Th or thorogenic 208Pb. Hence, the obtained Pb-Pb dating can be regarded as the age of the Svecofennian metamorphic event. Three samples from
dolomites of unit I lack any disturbance of the initial U-Th-Pb systematics, but their trend in the 207Pb/204Pb-206Pb/204Pb diagram deviates from the 1900 Ma isochron. Based on these samples, the model U-Pb premetamorphic age of the Kuetsjarvi
carbonate sediments is 2075–2100 Ma. This interval is consistent with the age range of the Lomagundi-Jatulian event, which
was responsible for the formation of carbonate sediments with high positive δ13C values. 相似文献