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Now showing items 1-20 of 163
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(2004)Precambrian conglomerates are known in composition of Marshakskaya suite (R2) within the western slope of the Southern Ural. Terrigenic and other formations are noted in the paleoriftogenic structure. Investigations of the ...
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(1980)This report lists acritarchs found in the various countries studied for I.G.C.P. Project No. 2. The results are provisional as collecting was not always made in accordance with the adopted rules. The research on the ...
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(2001)207Pb/206Pb ages are presented for detrital zircons (Laser Ablation Microprobe ICP-MS) and whole-rock Nd isotopic determinations (TIMS) from samples of Neoarchean and Palaeoproterozoic metasedimentary rocks from the Umba ...
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(2001)The Tuvino-Mongolian Massif (TMM) was previously interpreted as a Precambrian block within the Central Asian Mobile Belt. According to this idea, it consists of tectonic slices composed of metamorphic rocks of pre-Mesoproterozoic ...
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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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(1988)The southeast margin of the Baltic shield is a typical Archean granite-greenstone region and, in many respects, resembles analogous Precambrian structures in other regions. We have obtained new data on age relationships, ...
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(1987)Earth scientists have long believed that the present-day volume of the hydrosphere has been stable for a long time and that its changes in the present and future will be extremely small. The earth's water is believed to ...
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(2002)We propose that Baltica was geographically inverted throughout the Neoproterozoic and therefore suggest reassessment of the classic Wilson Cycle paleoreconstruction de- picting an Atlantic-type early Paleozoic (Iapetus) ...
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(2001)The mineralogy, chemistry and stratigraphy of Precambrian banded iron formations have been extensively documented, yet the way such formations are produced remains a subject for debate. Differentiation by varving, microbial ...
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(1987)Among the obligatory components of the Precambrian iron formation rock (PIF) are the quartzite layers interstratified with ore and silicate layers. On the facies distribution of rocks of Archean and Lower Proterozoic iron ...
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(2011)The results of K-Ar and Rb-Sr isochronous dating of the Late Precambrian basite intrusive rocks of Omolon Massif serve as a basis for the author to make generalized conclusions. According to the geologic interpretation of ...
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(1996)Due to the large partition coefficients of garnet for Lu compared to Sm, Nd, and Hf, garnet residual from crustal melting events has a large potential for retaining Lu and, over time, producing high reservoirs in the lower ...
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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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(2004)Geostructural setting, as well as mineral and isotopic compositions, of separate apatite deposits and occurrences in the Aldan Shield composed of Precambrian metasedimentary apatite–carbonate rocks are considered. In terms ...
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(1997)Original δ13C values of abiotically precipitated marine cements from a variety of stratigraphic intervals have been used to document secular variations in the δ13C values of Phanerozoic oceans. These, together with the ...
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(1988)Fields of granitic pegmatites containing rare metals in industrially important Precambrian zones are accompanied by regional zones of hydrothermally-altered rocks containing high concentrations of hydromagmatophilic elements ...
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(1992)Current hypotheses for the source rock of low Ca garnets hosted in mantle-derived diamonds and xenoliths range from residues of komatiite generation, to subducted serpentinite, to subducted mid-ocean ridge (MORB) harzburgite. ...
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(1997)The velocity structure of the crust and uppermost mantle beneath the DSS profile Quartz in northwestern Russia is determined using a linearized seismic tomography scheme. The analysis is performed on the northern 2200 km ...
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(2001)Results are presented of reinterpretation of data from the deep seismic sounding profiles XXIV and XXX, geotraverse II and wide-angle reflection profiles XIII and XIV, located in the region of Korsun'-Novomyrgorod and ...
Now showing items 1-20 of 163