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Now showing items 61-80 of 218
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(Федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский государственный университет», 2020)В данной статье представлены результаты моделирования условий поглощения природных радионуклидов (уран-238, торий-232, калий-40) в различных природных средах (вода и кварцевый песок) для оценки влияния защитных свойств ...
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(2004)For over one hundred years the Ordovician fossil Solenopora Dybowski has been widely considered to be a calcified red alga. The type species, Solenopora spongioides, consists of tubes with longitudinally flexuous walls, ...
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(2003)Here we present Sr, C, and O isotope curves for Ordovician marine calcite based on analyses of 206 calcitic brachiopods from 10 localities worldwide. These are the first Ordovician-wide isotope curves that can be placed ...
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(1996)The modern substantiation of the boundaries in the Phanerozoic scale of geologic time is discussed with reference to absolute geochronology. The critical analysis of the isotopic-geochronologic data that form the basis of ...
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(2003)Stratigraphic and geographic distribution of corals of the family Agetolitidae Kim is analyzed. The family is a unique group bearing characters of both tabulatomorphic and rugose corals.
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(1989)Any significant decrease in volume or thickness of rocks may lead to the formation of weakened zones (decomposition) and subsequent structural deformation. Rock decarbonization as one of the factors controlling the ...
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(1998)Carbonate-phtanite sediments of Bogambir suite (Uppermost Precambrian, Northern Nuratau Mountains, Uzbekistan) are to be discriminated from Ordovician and Silurian in the imbricated Variscian structure of Bogambir range. ...
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(2013)We present geological, structural, and geochemical data on synmetamorphic granitoids from the Tutai and South Ol’khon plutons of the Ol’khon terrane (Central Asian Fold Belt) with an estimation of the U–Pb zircon age of ...
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(1996)Concentrations of the Fe(CO3)OH component in goethites from Phanerozoic oolitic ironstones appear to record information on the partial pressures of soil CO2 in ancient subaerial weathering environments. Application of a ...
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(2003)Data on lithology, trilobites, and ostracodes from the Azeri, Lasnamagi, and Uhaku horizons of the Ladoga structural-facies zone are discussed. Biostratigraphic subdivision based on asaphids (trilobites) has been conducted, ...
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(2005)The radiolarian Beothuka terranova occurs in the Arenigian Didymograptellus bifidus Biozone (uppermost Lower Ordovician) of Spitsbergen (Svalbard), associated with a diverse and well-preserved radiolarian fauna. The presence ...
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(2001)The Lower Paleozoic strata belonging to the Kara Basin are extensively exposed in the Severnaya Zemlya Archipelago. During the Cambrian, thick clastic sequences are the dominating sediments on Severnaya Zemlya. The Cambrian ...
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(2003)Biotite is one of the most common minerals dated by the 40Ar-39Ar method. It frequently shows K contents below the expected stoichiometric value, suggesting the presence of low-K impurities. The most common low-K alteration ...
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(2004)The paper considers the first discovered larval shells of Rhynchonelliformea brachiopods from the Lower Ordovician of the Leningrad region Casts of larval shells on the pedicle and brachial valves are characterized by a ...
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(2001)The bio- and lithostratigraphy of the poorly known early Ordovician (Arenig) Hunneberg Stage is described from the area east of St. Petersburg (Putilovo Quarry and Lava river), where the Lakity Beds (Leetse Fm.) consist ...
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(1998)Information on lithology, trilobites, and ostracodes from some sections of the Volkhov and Kunda horizons of the Volkhov structural-facies zone (the eastern part of the Leningrad region) is presented. Described in the paper ...
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(2004)A Late Ordovician episode of remarkable biotic, climatic, sea level and facies changes, named here as the Middle Caradoc Facies and Faunal Turnover, took place in the Baltoscandian area. This paper presents an integrated ...
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(1992)The Caledonides of Ny Friesland comprise the type Hecla Hoek sequence of Svalbard, a succession of late Proterozoic to Ordovician strata greater than 18 km thick. Three supergroups constitute the sequence: the Stubendorffbreen ...
Now showing items 61-80 of 218