Цифровой репозиторий ГГМ РАН
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listelement.badge.dso-typeЭлемент, FORMATION OF THE SOUTH CASPIAN BASIN AS A RESULT OF PHASE TRANSITIONS IN THE LOWER CONTINENTAL CRUST(2007) Artyushkov E.V.A number of deep troughs with sedimentary sequences no less than 15–20 km thick are known within continents and at their margins. The South Caspian, Near-Caspian, Barents, and Black Sea basins pertain to this category. The thickness of the consolidated crust in their deep parts decreases to 10–20 km, whereas the P-wave velocity increases to the values characteristic of basic rocks. Therefore, this crust is often referred to as oceanic. However, according to, deep parts of the Barents and Near-Caspian basins are underlain by the continental crust. Its subsidence was caused by phase transitions with compaction of basic rocks in the lower crust.listelement.badge.dso-typeЭлемент, RADIOCARBON DATES OF EVOLUTION CYCLES OF THERMOKARST LAKES ON THE KOLYMA LOWLAND(2007) Shilo N.A.; Lozhkin A.V.; Anderson P.M.Lacustrine thermokarst plays an exclusively important role in the evolution of periglacial lithogenesis and relief formation on the Kolyma Lowland, which is located along the East Siberian Sea and the western Yana–Indigirka Lowland. The multicomponent process of heat exchange upsets thermodynamic equilibrium, development of the deep-seated thermokarst, and migration of lakes on the lowland surface. The migration of lakes results in restoration of thermodynamic equilibrium on areas previously occupied by the lakes and revival of underground ice formation. Polycyclic evolution of lakes is related to their migration. Lacustrine–thermokarst erosion of the high surface of the lowland (edoma), which is irregular in terms of duration in different areas, leads to the formation of alasses (depressions in pergelisoil) of several levels.listelement.badge.dso-typeЭлемент, ISOTOPIC-GEOCHEMICAL CHARACTERISTICS AND DEEP-SEATED SOURCES OF THE ALKALI ROCKS OF THE PEKTUSAN VOLCANO(2007) Sakhno V.G.Late Cenozoic volcanic rocks are widespread in the Russian Far East. They are mainly represented by eruptions of basaltic lavas, which compose the Sovgavan, Nelminskii, Shufanskii, and Shkotovskii plateaus, among others. Alkali basalts with xenoliths of spinel lherzolites compose monogenetic volcanoes and their vents along the deep-seated Tan Lu fault system in Northeast China and in the Ussuri–Amur rift system of the Primor’e and Amur regions, as well as along the faults of the Tokin Stanovik. Some volcanoes (Bolonski, Udalyanchi, Keluo, and others) consist of potassic alkali basaltoids (leucitic basanites, leucitites, trachybasalts, and other rocks).listelement.badge.dso-typeЭлемент, POSSIBILITY OF REALIZATION OF CONTACT-FREE ELECTROMAGNETIC GEOTHERMOMETER(2007) Spichak V.V.; Zakarova O.K.; Rybin A.K.Estimates of temperature in the Earth’s interior are usually obtained on the basis of thermograms from boreholes or data on the thermal flux. However, both approaches have restrictions. For example, in the first case, it is necessary to perform spatial interpolation of thermograms commonly measured in some nonuniformly distributed boreholes, which frequently leads to significant errors. In the second case, the construction of a temperature model is based on the assumption about stationarity of thermal fluxes at lateral boundaries of the model zone and a priori knowledge of the thermal flux (temperature) at its upper and lower boundaries. Since its values (especially at the lower boundary) are usually specified very approximately, the construction of models of temperature distribution on this basis can also lead to significant errors.listelement.badge.dso-typeЭлемент, NONLINEAR DYNAMICS OF SLOPE FLOWS: SIMPLE MODELS AND EXACT SOLUTIONS(2007) Rudenko O.V.; Sobisevich A.L.; Sobisevich L.E.Regular observations at the Northern Caucasus Geophysical Observatory recorded on March 10, 2006, a catastrophic avalanche, which caused disaster and fatalities. The instruments located immediately beneath the avalanche development zone in the tunnel of the Baksan neutrino observatory recorded detailed structure of the seismic and magnetic fields at the stage of preparation and descent of the avalanche. We obtained unique data that make it possible to correlate them with independently measured characteristics of the avalanche (volume of the snow mass, velocity of motion, moments of contacts with uneven features of the pathway, and so on). However, simple models and formulas for the specific analysis are lacking. Therefore, we propose a theoretical basis for comparison with the field experiment data.