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Now showing items 41-60 of 154
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(1995)The Siberian Traps represent the largest known Phanerozoic manifestation of continental flood volcanism. The general agreement is now that the volcanism was of short duration (∼ 1 m.y.) and was synchronous with the ...
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(2003)The appearance of planktonic foraminifers is the most dramatic episode in the evolution of Protozoans and an important event in the development of the biosphere during the last 400 Ma. Data on initial stages of the development ...
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(1989)Conodonts, one of the leading groups used for detailed stratigraphy, are rare in the Triassic deposits in the south of the USSR. In 1986 and 1987 the authors made a special search for conodonts in the Triassic of the ...
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(1990)One of us (V.I.D.) has been investigating the tectonics, stratigraphy and the age of the rocks of the Rushan-Pshart region since 1959. We refocused our research to siliceous beds, in the hope of finding radiolarians or ...
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(1989)The basanite explosion pipes in the area of the Kop'yevo uplift in the Chulym-Yenisey basin (CYB) are widely known because they contain xenoliths of peridotite, pyroxenite and megacrysts of other minerals and others). ...
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(2003)Ion-microprobe U–Th–Pb analyses of zircon from three high-level syenite–granite stocks in the western part of the Taimyr fold-and-thrust belt have yielded early Triassic ages of 249–241 Ma. Those syenite–granite bodies ...
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(2001)Rb-Sr and Sm-Nd isotopic systems were investigated in the peralkaline granitoids and comagmatic volcanic rocks, which compose the Northern Mongolia-Transbaikalia Belt (NMTB). The belt extends over more than 2000 km at a ...
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(1990)The deposition of apatite in the past was preceded and promoted by numerous factors, chief among which were tectonic factors (endogenous conditions) and igneous and metamorphic factors. Thus, on tectonically stable structures, ...
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(2004)Early Mesozoic geological events played an important role in the structural evolution of Eastern and Central Asia. They involved collision between Siberia and Sino-Korean continents. This was accompanied by the closure of ...
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(1997)Geological heritage, as part of natural heritage, includes the in situ located geological reference objects (sites) visualising geological phenomena with high information potential. Forty objects of geological heritage of ...
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(2006)The aim of this study was to generalize the data available for the paleointensity, polarity, and frequency of reversals, and variations in the direction of the geomagnetic field in the vicinity of the Paleozoic and Mesozoic ...
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(2004)Pedogenic goethites in each of two Early Permian paleosols appear to record mixing of two isotopically distinct CO2 components—atmospheric CO2 and CO2 from in situ oxidation of organic matter. The δ13C values measured for ...
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(2002)A new genus and species of the family Trirachodontidae, Neotrirachodon expectatus gen. et sp. nov., is described on the basis of the lower jaw previously referred to as the gomphodont cynodont Antecosuchus ochevi. The new ...
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(1999)The paper gives the definition of the North-Asian craton as a geological structure. The evolution of conception and views of its structure and boundaries is considered, and a brief overview of its geologic history in terms ...
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(1996)We report high-resolution single-zircon UPb age data for Middle Triassic volcaniclastic intercalations in biostratigraphically calibrated pelagic successions of the Southern Alps. The results require a redefinition of the ...
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(2002)Hopanoic acids were found in all but the two most mature of a suite of 30 Triassic to Cretaceous sedimentary rocks. Their carbon number distributions generally maximise at C32, consistent with hopanoic acids found in modern ...
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(2002)Three horizons of phthanites and black carbonaceous mudstones are distinguished in the key section of Triassic and Jurassic cherty deposits of the Gorbusha Sequence near the Settlement of Dal'negorsk (Sikhote Alin). The ...
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(2001)The warm biospheres of the Late Cretaceous and Early Triassic interglacials existed alternately in the humid or arid state. The stages of humid and arid climate differed considerably in their paleogeography and sedimentation ...
Now showing items 41-60 of 154