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Browsing ELibrary by Title
Now showing items 3351-3370 of 21934
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(2004)This communication discusses the issue of the formation of Early Caledonian batholiths based on comparative analysis of their age and Nd-Isotope characteristics in thee Altai-Kuznetsk -Batenev segment dominated by collisions ...
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(2004)The leucocratic subalkaline granites found in the eastern margin of the Argun' terrane have an U-Pb age of 467-472 Ma and compose relatively small tectonic blocks among Silurian and Devonian terrigenous-carbonate deposits ...
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(1998)A number of terranes were present in the early Paleozoic ocean between Laurentia and Gondwana following rifting. The precise location of these microcontinents and island arcs is unclear. We present tectonic subsidence ...
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(2003)Conflicting paleogeographic reconstructions of the Ural–Mongol fold belt have been developed over the past decade; very few of them, however, have been based on paleomagnetic data, which still remain scarce. The Chingiz ...
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(1999)Materials from many lower Pleistocene localities of small mammal remains elucidate principal stages of the fauna evolution in eastern Europe and enable the biostratigraphic subdivision of host deposits on the basis of ...
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(2004)The Mjølnir bolide created the 40-km diameter Mjølnir crater, when it impacted the black, mostly anoxic clays of the Hekkingen Formation in the paleo-Barents Sea about 142±2.6 million years ago. The normally calm, 300–500 ...
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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 ...
Now showing items 3351-3370 of 21934