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Now showing items 41-60 of 125
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(1997)The Upper Riphean biostratigraphic characteristic of the Timan was supplemented with the new data provided by the drilling of a number of wells in the Tsil'menskii Kamen' region. Its western sections include abundant ...
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(2001)Remains of complex prokaryotic and eukaryotic organisms are found in the Seryi Klyuch Formation of the Yenisei Ridge. Taxa described here add substantially to our knowledge of Riphean paleobiology. Precambrian rocks are ...
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(2002)New nonmineralized gemmating dimorphic microorganisms have been discovered in the Lakhanda Group at the base of the Upper Riphean (ca. 1.025 Ga) of the Uchuro-Maiskii region of southeastern Siberia. The daughter buds are ...
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(2002)During the last three billion years, the Earth has been experiencing a slow global cooling, expressed in the progressively increasing frequency and scale of glacial events. Based on these indications, geologic history can ...
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(1999)In the Bashkir mega-anticline (western Urals) stratabound magnesite, siderite, fluorite and base-metal deposits are hosted by a sequence of Riphean sediments with a thickness of more than 12 km. The giant deposits of ...
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(1990)The microfossils of the genus Palasopleurocapsa are characterized by a very distinctive structure. They are the fossilized remains of attached chamesiphonal blue-green algae, in which the thallus is formed of closely ...
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(2001)Diverse assemblages of silicified microfossils have been detected in lenses of black chert within peritidal carbonates of the Neoproterozoic (Upper Riphean) Shorikha and Burovaya formations, Turukhansk Uplift, northeastern ...
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(1985)Abstract Paleomagnetic research in the Siberian area provides new data to derive models of relative horizontal movements and the process of amalgamation or consolidation of the Siberian plate. Comparison of the Apparent ...
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(2001)The carbonate Malgina Formation, a constituent of the Riphean hypostratotype in Siberia, corresponds, according to paleontological evidence, to the terminal Middle Riphean horizons, and present-day geochronological data ...
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(2000)The Timan biota from Russia and Huainan biota from China proved the pre-Ediacarian Metazoa did exist in the past. In Russia, the genus Parmia Gnilovskaya of the pre-Ediacarian annelidomorphs, whose construction has distinct ...
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(2001)Isotopic dates for upper horizons in one of the Riphean reference sections of northern Eurasia are calculated on the basis of the Rb-Sr systematics of fine size-variable subfractions (SF) of clay minerals. The SFs with ...
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(1990)Several zones of disseminated chalcopyrite-bornite mineralization have been recorded in the Nomgon differentiated pluton of troctolite-anorthosite-gabbro composition, located in the Orkhon-Selenga basin and surrounded by ...
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RIPHEAN SEDIMENTARY SEQUENCES OF THE EASTERN AND NORTHEASTERN MARGINS OF THE EASTERN EUROPEAN CRATON (2002)The Riphean history of depositional basins in the study region can be divided into Early-Middle Riphean and Late Riphean phases. Throughout the Riphean, clastic material was supplied chiefly from eastern regions of the ...
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(2002)The Riphean (1500-1450 to 1000-950 Ma, Ar-40/Ar-39, K/Ar) section of petroliferous peritidal carbonates in the Baikit uplift (western Siberian Platform) contains five sequences, each divided into three to five subsequences, ...
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(2001)The Riphean to Vendian ( ≈1600–540 Ma) sedimentary succession of the southeastern margin of the Siberian platform is 12–14 km thick and consists of terrigenous-carbonate successions termed, from oldest to youngest, the ...
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(2002)The sialic (volcanogenic) material of the terranes in 3the Siberian fragment of a Paleoproterozoic supercontinent separated from the mantle 3.5, 3.3, 3.0, and 2.5 billion years ago. The collision zones (sutures) between ...
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(2000)Taxonomic composition of six stratigraphically important Riphean microbiotas from the southern Urals (Bashkirian meganticlinorium) and adjacent region (the Verkhnyaya Kama depression of the Kama-Belaya aulacogen) is ...
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(2001)Potassic magmas (their derivatives, kimberlites and others) are among the products of incipient mantle melting, which occurs at an increase in heat flow (plume ascent). They provide reliable information on the composition ...
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(2003)The presented Rb-Sr systematics of carbonates from the Karatau Group, the Upper Riphean stratotype of southern Urals, elucidates important details of secular variations of 87Sr/86Sr ratios in the Late Riphean seawater, ...
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(2003)The progress in Rb-Sr, U-Pb, and Pb-Pb methods offered new possibilities in gaining direct information concerning the sedimentation environment of Precambrian carbonate rocks and their age. The application of this approach ...
Now showing items 41-60 of 125