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Now showing items 21-40 of 71
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(2001)The formation of Gondwana during the late Neoproterozoic to early Cambrian times (550-530 Ma) was traditionally viewed as the welding of two, more or less contiguous, Proterozoic continental masses called East and West ...
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(2001)It is difficult to assign the animal-like body fossils of the late Neoproterozoic to crown metazoan phyla. Many Neoproterozoic fossils appear to share an architectural theme, which was characterized by Seilacher (1984, ...
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(2003)The east margin of the Siberian craton is a typical passive margin with a thick succession of sedimentary rocks ranging in age from Mesoproterozoic to Tertiary. Several zones with distinct structural styles are recognized ...
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(1996)Five overlapping sections from the thick Neoproterozoic to early Cambrian sediments of western Mongolia were analysed to yield a remarkable carbon-isotope, strontium-isotope and small shellyfossil (SSF) record. Chemostratigraphy ...
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(2004)Single grains of detrital white mica from two different synorogenic sediments in the Southern Urals were analysed using the insitu ultraviolet laser ablation Ar609 Ma age group is phengitic in composition (Si 3.3732 Ma age ...
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(2003)The stratiform stromatolitic cherts from the Meso—Neoproterozoic Sukhaya Tunguska Formation (ca. 1,100–900 Ma) of the Turukhansk Uplift, Russia, preserve an abundant and varied record of ancient microbial life. The assemblages ...
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(2003)Methane mixing ratios of 100-300 ppm in the Proterozoic atmosphere (0.75-2.3 Ga) would have been sufficient to offset the climatic effects of the faint early sun and maintain the warm climate during those 1.5 b.y. The major ...
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(2003)Molar tooth structures are abundant in large (1-2 m diameter) carbonate nodules within fine-grained, subtidal carbonates of the early Neoproterozoic (lower Upper Riphean) Burovaya Formation along the Sukhaya Tunguska River, ...
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(2001)The Tuva-Mongolia Massif is a composite Precambrian terrane incorporated into the Palaeozoic Sayany-Baikalian belt. Its Neoproterozoic amalgamation history involves early (~800 Ma) and late Baikalian (600–550 Ma) orogenic ...
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(2004)Neoproterozoic tectonics is dominated by the amalgamation of the supercontinent Rodinia at ca. 1.0Ga, its breakup at ca. 0.75Ga, and the collision between East and West Gondwana between 0.6 and 0.5Ga. The principal stages ...
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(2003)The geological, structural and tectonic evolutions of the Yenisey Ridge fold-and-thrust belt are discussed in the context of the western margin of the Siberian craton during the Neoproterozoic. Previous work in the Yenisey ...
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(1999)Age of metamorphic and magmatic rocks from the Mountainous Shoriya is measured using U-Pb, Sm-Nd, Rb-Sr, and Ar-Ar dating. As established, the oldest rocks of the region are metabasites of the Konzhin Complex (Sm-Nd isochron ...
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(2002)The effusive rocks of the Ratno Beds of the Volhynian Series known from the western slope of the Ukrainian Shield are represented by lower Vendian flood basalts whose normative composition is that of quartz tholeiites. ...
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(2003)Geochemical, petrographic, mineralogical and geochronological study of mafic dikes in the Sharyzhalgai massif of the south Siberian craton has revealed the presence of three distinct generations of dikes. The youngest and ...
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(2004)The eastern margin of the East European Craton (EEC) has a long lasting geological record of Precambrian age. Archaean and Proterozoic strata are exposed in the western fold-and-thrust belt of the Uralides and are known ...
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(2003)The paper reports data on the petrology and geochemistry of granitoids of the Glushikha Complex in the Transangara area of the Yenisei Range and presents U-Pb, Sm-Nd, Rb-Sr, and Ar-Ar isotopic geochemical data on these ...
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(2002)Thermal contraction cracking of permafrost produced sand-wedge polygons at sea level on the paleo-equator during late Neoproterozoic glacial episodes. These sand wedges have been used as evidence for high (=<54°) paleo-obliquity ...
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(2003)The paper reviews and integrates the recent geological and geochronological data, which allow us to recognize three stages of the evolution of the Paleo-Asian Ocean.The opening of the Paleo-Asian Ocean at 970-850 Ma is ...
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(2002)We present a synthesis and a new account of the geological and tectonic history of the terranes of the Chinese Paleozoic Altai orogen together with new, single zircon ages for granitic and rhyodacitic rocks. A central ...
Now showing items 21-40 of 71