Long-Term Variations in the Parameters of the Middle and Upper Atmosphere and Ionosphere (Review)

Geomagnetism and Aeronomy - The article reviews the main publications from the last eight years on long-term trends in the parameters of the middle atmosphere, thermosphere, and ionosphere. It is...     

Ionospheric Precursors of Magnetic Storms. 2. Analysis of Slough Station Data

Geomagnetism and Aeronomy - The behavior of the critical frequency of the F2 layer, foF 2, during the 3 days preceding a magnetic storm is analyzed. A total of 254 storms in 1976–2010...     

Sr isotope composition in inland seas of the Mediterranean-Black Sea belt

Doklady Earth Sciences -     

Sr isotopic chemostratigraphy of Precambrian carbonate rocks in the Amderma Rise,Pai-Khoi Ridge

The Sr and C isotopic compositions of Precambrian carbonate rocks are determined for Amderma Rise, in the northeastern margin of Pai-Khoi Ridge. Based on the Sr isotopic chemostratigraphy, it is established for the first time that the Amderma Formation is referred to the Early Vendian, while the Morozovsk Formation is Late Riphean in age. This conclusion along with detailed mapping proves that the Precambrian “section” of the Amderma Rise is a series of tectonic plates combined in a nonchronostratigraphic order. Volcanic and sedimentary rocks of the Morozovsk and Sokolninsk formations make up the allochthon proper, while carbonate rocks of the Amderma Formation make up the para-autochthon. The high values of δ¹³С (up to +9.5‰) identified in limestones of both formations suggest a considerable distance of the Pai-Khoi paleobasin from the passive margin of the Baltic Region upon facies similarity to the Laurentia active margins.     

The Strontium Isotopic Composition in Glendonites of the Middle Jurassic in Northern Siberia

The Sr isotope composition in glendonites from two sections of the Middle Jurassic of Northern Siberia has been determined for the first time. Glendonite was formed by the replacement of icite by calcite during diagenesis. The ⁸⁷Sr/⁸⁶Sr in most of the samples of glendonites (0.70687–0.70715) is insignificantly lower than this ratio in the Late Bathonian–Early Bajocian ocean. This may indicate a contribution from the Callovian seawater in the formation of individual calcite generations or the influence of methanogenic fluid of deep origin.     

Mineralogical,Crystal-Chemical,and Rb–Sr Isotope Data on Terrigenous Globular Phyllosilicates of the Maastakh Formation (Lower Vendian,Olenek Uplift)

Lithology and Mineral Resources - The mineralogical, structural, crystal-chemical, and isotope-geochronological data were obtained for the first time in two samples of globular phyllosilicates...     

Effects of the Deformation and Liquefaction of Soils in the Settlement of Korf during the Olyutor Earthquake on April 21, 2006

On April 21, 2006 an earthquake with a magnitude of M _s = 7.7 named Olyutor struck the Koryak Autonomous Region. It was the strongest earthquake for the entire period of historical and instrumental observations. The coordinates of the epicenter were 60.91° N, 166.98° E; the hypocenter’s depth was 12 km. For the efficient study of the earthquake, a team of scientists of the Institute of Volcanology and Seismology of the Far Eastern Branch of the Russian Academy of Sciences (RAS) was sent to the epicentral area. The article presents the results of studies of soil liquefaction in the settlement of Korf, which was the most affected during the Olyutor earthquake. The intensity of the earthquake in the settlement was 9 points. Numerous cracks in the soil were observed, sand volcanoes were formed, and there were numerous cases of sand and silt eruptions, subsidence, and flooding in the settlement. It was decided that the settlement was unfit for human habitation.