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Now showing items 21-40 of 110
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(2015)U–Pb dating and Hf-isotope analysis of zircons and whole-rock Nd-isotope analyses were carried out on country rocks of the eclogite–gneiss complex of the North Muya dome in the Anamakit-Muya zone of the Baikal Muya ...
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(2003)Understanding the processes that led to the mineralization of Precambrian metazoan eggs and embryos is essential to informed interpretations of such fossils and their significance in early metazoan evolution. Here we show ...
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(2003)The Earth may have been globally ice-covered several times during the Proterozoic. While the Neoproterozoic and the Paleoproterozoic glaciations may have been 'snowball' Earth events, there is no evidence for such glaciation ...
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(2001)U–Th–Pb analyses of zircons from six granites and one metasediment collected in the accretionary Central belt of Taimyr, Arctic Siberia, demonstrate that Neoproterozoic (c. 900 Ma) granites intrude late Mesoproterozoic/early ...
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(2010)U/Pb dating, REE geochemistry and Lu/Hf isotopic studies utilizing LA-ICPMS on detrital zircon suites from Neoproterozoic siliciclastic rocks fromthe northeast periphery of the East European Craton (sandstones of Djejim ...
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(1996)Diamictites, many of glacial origin, are globally distributed in the Neoproterozoic. Recently, two relatively thin diamictites in the Maikhan Uul Member at the base of the Neoproterozoic Tsagaan Oloom Formation from the ...
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(2001)Thick, unmetamorphosed successions of siliciclastic and carbonate rocks in eastern and western Siberia preserve a record of Middle Riphean to Early Upper Riphean sedimentary environments and geochemistry. Consistent with ...
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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. ...
Now showing items 21-40 of 110