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Now showing items 1-20 of 188
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(1986)Archaean gneisses in the Vestfold Block, Antarctica are cut by abundant tholeiite and rare alkaline dykes. At least five generations of dykes have been recognized on the basis of intrusive relationships, petrography and ...
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(1999)First investigation results on Sm-Nd isotope systems in clastic metasedimentary and metavolcanic rocks from the high-grade metamorphic supracrustal complexes of central Aldan Shield are used to approximately evaluate their ...
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(2001)The intrusive complexes of Gremiakha-Vyrmes and Soustov represent the two extremes of the Early Proterozoic alkaline plutons of Kola, predominantly composed of feldespathoidal syenites. Gremiakha-Vyrmes rocks (zircon age: ...
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(2006)The Southern Urals of Russia contain what is arguably one of the best-preserved examples of an arc-continent collision in any Paleozoic orogen. The arc-continent collision history recorded in the rocks of the Southern Urals ...
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(2003)The Jormua ophiolite represents seafloor from an Early Proterozoic ocean to continent transition zone that mainly consisted of Archean subcontinental lithospheric mantle. These mantle rocks were exhumed as a result of ...
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(1981)Riphean and Palaeozoic linear graben-like platform depressions — aulacogens —jointly with linear swell uplifts in a platform cover, intraplatform folded zones and Meso-Cenozoic epi-platform rift zones are different ...
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(1999)The study of the fossilization processes of modern cyanobacteria provides insights needed to recognize bacterial microfossils. The fossilization of cyanobacteria is discussed and images of recent and fossil bacteria and ...
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(1988)In the Lower Proterozoic formations of Karelia, USSR carbonaceous rocks are relatively widespread and are dated as Lyudikovian. The shungite-bearing rocks have an unusual chemical composition. Sharply dominant are two ...
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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)While studying the supracrustal Pechenga complex, we found Lower Proterozoic microfossils in our petrographic thin sections. The rocks containing these organic remains make up a two-meter unit of microquartzite, altered ...
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(2003)Large subvolcanic intrusions are recognized within most Precambrian VMS camps. Of these, 80% are quartz diorite-tonalite-trondhjemite composite intrusions. The VMS camps spatially associated with composite intrusions account ...
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(1988)A rare-earth fluoride of sodium and calcium with the formula NaCaREF6 was discovered in 1958 in an albitized granite (apogranite) pluton and called gagarinite. It is a typomorphic mineral of rare-metal alkalic metasomatites, ...
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(2006)Chinese Altai has proterozoic basement, and probably experienced four major events during Proterozoic era. Research about Precambrian basement is the base of dertermination of Altai-Momgolia microcontinent. The span of ...
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CONSOLIDATION OF CONTINENTAL CRUST IN LATE ARCHAEAN-EARLY PROTEROZOIC TIMES: A PALAEOMAGNETIC TEST (2003)The proposition that continental crust consolidated during late Archaean-early Proterozoic times as spatially distinct groups of cratons is tested using palaeomagnetic results assigned to the interval 2900-2200 Ma. Geological ...
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(2003)During Proterozoic time, growth of the continents took place by the addition of mantlederived, juvenile material to pre-existing continental blocks. This accretion took place largely within three tectonic environments: (1) ...
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(2004)A continuous record of the geomagnetic field direction during of cooling of the Monchegorsk (2.5Ga), Kivakka (2.45 Ga) and Bushveld (2.06 Ga) layered intrusions was conducted for the first time. The low-Ti titanomagnetites ...
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(1992)Data on the geophysics and geology of the jointing zones separating the areas of Archean and early Proterozoic consolidation of the Ukrainian and Baltic shields were compared. It was discovered that the deep structure and ...
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(1993)In this paper we discuss the distribution, geochemical cycle, and evolution of CO2 and N2 in Earth's degassed mantle, atmosphere, and continental crust. We estimate the present distribution of CO2 and N2 in Earth's degassed ...
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(1985)Several years of research on deformational history of the Alps and their Central European foreland led to the development of new models for the driving mechanism of continental drift and intraplate tectonics. It was found ...
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(2003)The analysis of radiometric ages of Early Precambrian basites of the Fennoscandian shield, from the most ancient ones, > 3.1 Ga, to 2.40 Ga, resolves five age groups of the basites. Each of these stages is shown to time ...
Now showing items 1-20 of 188