Sukhorukov, V. P. Gladkochub, D. P. Turkina, O. M.
Published in
Doklady Earth Sciences
This work reports the first discovery of sapphirine-bearing mineral parageneses in granulites of the Angara–Kan block, information on the mineral assemblage of rocks, and the mineral composition. Based on mineral geothermometers utilizing alumina content in orthopyroxene, reconstruction of the composition of ternary feldspar, and the titanium conte...
Gorbachev, N. S. Shapovalov, Yu. B. Kostyuk, A. V.
Published in
Doklady Earth Sciences
To characterize the influence of alkaline metal chlorides on the phase ratios under melting of upper mantle eclogites, the eclogite–CaCO3–NaCl–KCl system with Н2О + СО2-fluid was studied in the experiments under 4 GPa and 1200–1300°C. A low difference in temperatures (1200 and
Sporyshev, P. V. Kattsov, V. M. Gulev, S. K.
Published in
Doklady Earth Sciences
The abilities of an ensemble of present-day global climate models are analyzed during modeling of evolution of the Arctic surface temperature over land including spatial consistency between the modeled and observed data. These results are the basis for probabilistic regional prediction of variation in the surface air temperature for the near future...
Rogulina, L. I. Moiseenko, V. G. Ponomarchuk, V. A.
Published in
Doklady Earth Sciences
New data on the composition of the major minerals from the skarn and vein polymetallic deposits of the Dal’negorskii ore region are reported. Analysis of galena and sphalerite was carried out by the X-ray fluorescent energy-dispersive method of synchrotron radiation for the first time. It is shown that the minor elements in major minerals of differ...
Kurgansky, M. V. Maksimenkov, L. O. Khapaev, A. A. Chkhetiani, O. G.
Published in
Doklady Earth Sciences
As an index of the general atmospheric circulation over the hemisphere, it is proposed to calculate the hemisphere-area-averaged (poleward of the latitude 20°) product of the Coriolis parameter by the wind velocity squared at the upper boundary of the planetary boundary layer. In practical calculations, data on the wind velocity at an isobaric leve...
Ivanov, M. V. Bushmin, S. A. Aranovich, L. Y.
Published in
Doklady Earth Sciences
An empirical model for the concentration dependence of the Gibbs free energy for solutions of chlorides of alkaline and alkaline earth metals in water is proposed. A simple analytical form of the Gibbs free energy makes it possible to obtain the equations of state for salt solutions that are equally accurate in the entire range of salt concentratio...
Damdinov, B. B. Zhmodik, S. M. Travin, A. V. Yudin, D. S. Goryachev, N. A.
Published in
Doklady Earth Sciences
This article presents new data on the age of the largest gold deposits in the southeastern part of Eastern Sayan. The dates have been obtained by Ar–Ar analysis of micas occurring in gold-bearing quartz veins and mineralized zones. The obtained Ar–Ar ages of fuchsite and sericite from the tectonized and mineralized zones of the Zun–Holba deposit (o...
Buchko, I. V. Sorokin, A. A. Rodionov, A. A. Kudryashov, N. M.
Published in
Doklady Earth Sciences
U–Pb ID–TIMS zircon analyses of the Dzhigda gabbro–gabbrodiorite Massif (Ilikan block in the southwestern part of the Dzhugdzhur–Stanovoi superterrane) have been carried out. The results demonstrate that the formation of the massif at 244 ± 5 Ma corresponds to one of the stages of formation of the Selenga–Vitim volcano–plutonic belt. The latter str...
Vrublevskii, V. V. Gertner, I. F. Chugaev, A. V.
Published in
Doklady Earth Sciences
The isotope geochemistry (εNd(t) 4.8–5.4, 206Pb/204Pbin 18.05–18.36, 207Pb/204Pbin 15.53–15.57, 208Pb/204Pbin 37.59–37.83, 87Sr/86Sr(t) 0.7048–0.7057, δ18OSMOW 8–10.5‰) and trace element composition of the Kiya–Shaltyr gabbro–urtite pluton allow us to suggest a heterogeneous source and complex geodynamic settings of the Devonian alkali magmatism in...
Dem’yanovich, V. M. Klyuchevskii, A. V.
Published in
Doklady Earth Sciences
Analysis of gentle, intermediate, and steep dip angles of fault planes in earthquake sources of the Baikal region is carried out with the slips in seismic sources being taken into account. The areas where normal faulting slips at steep, intermediate, and gentle angles took place are distinguished, and this can be interpreted as transformation of a ...
