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Now showing items 41-60 of 150
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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)Two genetic families of "ancient" oils, the main currently prospected resources, are known on the Siberian Platform. The available information on organic geochemistry of naphthide deposits and syngenetically bituminized ...
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(1999)Isotopic and geochemical data of the Zerenda series metamorphic rocks from the Kokchetav massif are reported. Some of these rocks contain microdiamond inclusions in garnets and other indicators of ultrahigh pressure ...
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(2001)Metamorphic rocks-hydrolysates, which are strongly enriched in Al and Fe (sericite, pyrophyllite, chloritoid, diaspore, and hematite schists), are developed in the interformational contact zone between Precambrian pre-Uralide ...
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(2002)This paper describes the Late Precambrian geologic complexes from the southern margin of the Siberian Craton, associated with the extension epochs. Analysis of the data available suggests that there were two episodes of ...
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(2002)Located at western portion of northern margin of North China craton, the Baotou-Bayan Obo district is one of the most important Fe-REE-Nb and Au metallogenic provinces in China. Presently, about 52 gold deposits and prospects ...
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(1996)The Muruntau gold deposit in the Kyzylkum desert of Uzbekistan is the largest single deposit (> 1100 tonnes of gold) of the class of low-sulfide syndeformation/synigenous gold deposits formed in the brittle/ductile transition ...
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(2004)It is shown that glauconite was mainly formed under diagenetic conditions in terrigenous–clayey rocks (Rausven Unit) of the Lower Cambrian Virbalis Formation in western Lithuania. This was preceded by bioturbation at some ...
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(1992)The late Precambrian and Cambrian world experienced explosive evolution of the biosphere, including the development of biomineral skeletons, and notably of phosphate and siliceous skeletons in the initial stages of the ...
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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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(1987)On a cryogenic investigation solid H2S was successively observed after freezing CO2 in water-poor fluid inclusions in halite of Cambrian Siberian salts. Melting of a H2S solid phase occurs at nearly eutectic temperatures ...
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(2001)We have analyzed 214 fossil apatite samples from nine stratigraphic sections worldwide that cover the lower Cambrian to lower Ordovician for their strontium isotope ratios. Of these samples, 180 from six sections that cover ...
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(2001)Based on REE analyses of 105 world-wide distributed Cambrian fossil apatite samples and eight late Neoproterozoic phosphate concretions, a close relationship is established between the concentrations of MREE and Ce anomalies. ...
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(2000)Illite-smectite (I-S) from Cambrian black shale of both early diagenetic and anchimetamorphic grade was investigated to determine the mechanism of the clay transformation. The layer sequences, the distribution of thicknesses ...
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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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(1996)Carbonate-rich sedimentary rocks of the western Anabar region, northern Siberia, preserve an exceptional record of evolutionary and biogeochemical events near the Proterozoic/Cambrian boundary. Sedimentologically, the ...
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(1996)A high-resolution Sr isotope study of Middle to Upper Cambrian platform carbonates of the southern Great Basin significantly refines the structure of the existing seawater Sr isotope curve. Samples were selected using ...
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(2001)Sensitive high resolution ion micro-probe (SHRIMP) U–Pb analyses of zoned zircons were performed to constrain the age and geodynamic significance of the Kokchetav ultrahigh-pressure (UHP) metamorphic rocks, which recrystallized ...
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(1999)Carbon and oxygen isotope variation curves for Vendian-Lower Cambrian carbonates of the Bokson Group are correlative with those characterizing coeval sections in Siberia and western Mongolia. The curves demonstrate the ...
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(1999)Abstract-Two clay fractions of a Cambrian claystone from Estonia, consisting essentially of illite and 20% expandable illite-smectite, (I-S) were treated with C12 and C,8 alkylammonium cations for K-exchange. Both the ...
Now showing items 41-60 of 150