Browsing ELibrary by Subject "Vendian"
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Browsing ELibrary by Subject "Vendian"
Now showing items 1-20 of 78
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(2004)The metamorphosed and severely deformed Upper Riphean rocks of the Baikal-Muya Foldbelt (BMFB) including ophiolite fragments of disputable origin are overlain with angular unconformity (locally, basal conglomerate) by a ...
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(1998)Siberia contains several key reference sections for studies of biological and environmental evolution across the Proterozoic-Phanerozoic transition. The Platonovskaya Formation, exposed in the Turukhansk region of western ...
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(2001)The presented results of U-Pb zircon dating (those for individual grains included) and Sm-Nd isochron ages for whole-rock samples and mineral fraction characterize magmatic complexes of the Muya segment of the Baikal-Muya ...
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(1990)In an area of the Eastern Aldan region, on the periphery of a large body of rocks of the ultramafic-alkalic carbonatite (UAC) association, in the middle of a formation of carbonate (dolomitic) rocks of Vendian to Early ...
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(1992)In light of recent additions to the Palaeozoic palaeo-magnetic data-base, particularly for the Ordovician era, a revised apparent polar wander (APW) path for Baltica has been constructed following a rigorous synthesis of ...
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(2004)A barium anomaly with a maximum Ba2+ concentration of 6.37mg/l was distinguished in a Cambrian-Vendian (Cm-V) aquifer system that is widely used as a drinking water source in the towns Kunda, Rakvere and Kohtla-Jrve of ...
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(1988)The golets zone in the mountains of southern Siberia occupies the summit belt of upland regions. Golets plants are enriched in many trace elements; the coefficient of biologic absorption, as calculated to the clarke for ...
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(1993)General agreement exists that the position of the base of the Cambrian (Precambrian–Cambrian boundary) should coincide with a biostratigraphic marker that can be widely traced and is linked to the evolution of the small ...
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(2004)Thermal maturation of organic mater in the Precambrian sedimentary rocks of western Bashkortostan and realization of their oil-gas generation potential were numerically estimated using a chemical kinetic model for the ...
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(2004)According to the proposed hypothesis, cosmic factors were primarily responsible for the flourishing of life on Earth over the last 600 Ma. We believe that the solar orbit first reached the galactic corotation radius in the ...
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(2002)A conulariid–like fossil is described for the first time from Upper Vendian (late Neoproterozoic) deposits. Vendoconularia triradiata gen. et sp. nov. is found with other fossils in poorly cemented, siliciclastic deposits ...
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(2003)The compositions of igneous rocks from the Tuva-Mongolia massif were studied. These rocks were formed during the precollisional, syncollisional, and postcollisional stages of massif formation. The compositions of strongly ...
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(1988)The principal features of the ore evolution process are traced by analysis of the conditions of generation of the Muruntau deposit. The ore genesis took place in the black shale Vendian-Lower Paleozoic association (Besapan ...
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(2001)Different stages of evolution of geological structures are recorded in time dynamics of their gravity field. The regularities of the crust evolution on the territory of Belarus were investigated through claculation and ...
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(1989)In 1978, in Precambrian metamorphosed bauxites of the Alag Uula deposit, we found a mineral identified as gibbsite high in copper and magnesium. This deposit is in western Mongolia in the eastern part of the Yihe Daribi ...
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(1989)Obruchevella, because of its characteristic structure (tubules coiled into a regular cylindrical spiral), is an extremely distinctive component of many Precambrian microfossil associations. It is widespread geographically, ...
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(2004)The Altai-Salair area in southern Siberia is a Caledonian folded area containing fragments of Vendian–Early Cambrian island arcs. In the Vendian–Early Cambrian, an extended system of island arcs existed near the Paleo-Asian ...
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(2004)Detailed geological, geochemical and biostratigraphic studies of rocks from basaltic-sedimentary terranes in the Kurai and Katun accretionary wedges (Vendian-Middle Cambrian units), the Charysh-Terekta strike-slip zone ...
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(1999)The Riphean and Vendian are characterized as a distinctive stage in the evolution of the biosphere. It is demonstrated that benthic and pelagic biotas of that time were sources of hydrocarbons in Precambrian sedimentary strata.
Now showing items 1-20 of 78