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Browsing ELibrary by Title
Now showing items 3338-3357 of 21821
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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 ...
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(2003)One of the world's largest Karelian trap province of Jatulian age (2.3-2.06 Ga) has been distinguished within the eastern Baltic Shield [1]. Flood basalts, sills, and dikes of the trap province found within Karelian and ...
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(1997)Scapolite is widely distributed in 1.9–2.5 Ga volcano-sedimentary rocks and 1.77–2.2 Ga igneous rocks over several hundred square kilometres in northern Fennoscandia, comprising northern Sweden, northern Finland and adjacent ...
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(2004)The geological evolution of the junction zone between the Olekma granite-greenstone belt and Aldan granulite-gneiss terranes (OGGB and AGGT, respectively) of the Aldan Shield involved at least four episodes of Early ...
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(1990)Early Proterozoic layered intrusions, about 2440 Ma in age, are widespread over a large area of the northeastern Fennoscandian Shield in Finland, Sweden and the Soviet Union. Only one intrusion, the Kukkola intrusion, is ...
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(2004)The Moscow region is situated in the most complicated tectonic junction of the East European Craton (EEC), characterized by the intrusion of tectonic units of various orders and ages, such as the wedge of the Neoarchean ...
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(2002)The basement structures of the southwestern Siberian craton include the cis-Sayan and Angara-Kan marginal uplifts that are parts of the Yenisei Ridge. The postcollisional granitoids abundant within the cis-Sayan uplift ...
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(2000)Specific features and evolution of tectonic elements of the ancient continental crust in the northeast of the Siberian craton are discussed on the basis of isotope-geochronological materials. We used data on the exposed ...
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(1998)Global sea-level fluctuated markedly during the early Silurian, probably as a result of the waxing and waning of ice-sheets in the South American portion of Gondwana. The highest sea-levels of the Silurian are recorded by ...
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(1998)We present results of a study of the 53Mn-53Cr systematics in various solar system objects: angrites, eucrites, chondrites, diogenites, pallasites, the Earth and the Moon, and SNC meteorites. The primary goal of this study ...
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(1988)The predominant rocks of the Anabar shield are basic pyroxene-plagioclase schists, metaultramafics, and various gneisses and granites with a minor number of partings of amphibolite, quartz, marble, calciphyre and other ...
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(2001)The main peculiarity of the tectonic and magmatic development of the Moon is its resemblance to the Paleoproterozoic stage of the Earth development. The Moon shows no analogues of both the ancient (Archean) terrestrial ...
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(2000)We report detailed high precision combined single grain U-Pb and Lu-Hf studies of early zircons to obtain more reliable indications of the extent of mantle depletion and crustal recycling in the Archean. Despite the ...
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(2002)Very different palaeogeographical reconstructions have been produced by a combination of palaeomagnetic and faunal data, which are re-evaluated on a global basis for the period from 500 to 400 Ma, and are presented with ...
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(2004)Palaeomagnetic and faunal data have been re-evaluated on a global basis for the period from 400 Ma (early mid-Devonian) to 250 Ma (latest Permian). The boundaries of the major terranes are considered and defined. Six new ...
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(1999)Earth system science has influenced and continues to influence our understanding of the relationship between humans and nature. The first important lessons were that our planet is not the center of the universe and we are ...
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(1989)Vertical displacements of the solid surface of the earth resulting from lunar-solar high and low tides are asymmetrical relative to the zero position, in that the amplitudes of the high tides are greater than those of the ...
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(2001)The Earth's main magnetic field, arising in the core, should, in the ocean, have a well-defined uniform gradient with depth. Superimposed upon this uniform gradient may be magnetic signals due to a variety of sources. These ...
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(1998)The lowest magnitude of complete reporting and its variations in space and time are estimated for several regional earthquake catalogs. The discussion focuses on questions of methodology and the space-time inhomogeneity ...
Now showing items 3338-3357 of 21821