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Now showing items 21-40 of 188
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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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(2006)Early Proterozoic granitoids are of a limited occurrence in the Baikal fold area being confined here exclusively to an arcuate belt delineating the outer contour of Baikalides, where rocks of the Early Precambrian basement ...
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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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(1986)Abstract Station “Khibiny”, equipped with a powerful magnetohydrodynamic (MHD) generator and/or diesel generator, has been successfully used since 1976 to study the electrical conductivity of the Earth's crust in the ...
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(2006)Raohe Complex, located in the eastern Heilongjiang Province and composed of deep oceanic sediments and mafic igneous rocks,was considered as slice of oceanic crust and intruded by Hamahe and Taipingeun granites. Zircon ...
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(1996)Major- and trace-element concentrations and Nd-, Sr- and Pb-isotopic ratios are reported for the Dovyren layered mafic-ultramafic intrusion in the northern Baikal region, eastern Siberia. SmNd internal isochrons for an ...
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(1989)The evolution of exogene copper accumulation can be illustrated by cupriferous sandstones and shales, which are known from the Early Proterozoic to the Neogene, inclusive. Their exogene origin throughout that time interval ...
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(2001)Different stages of evolution of geological structures are recorded in time dynamics of their gravity field. The regularities of the crust evolution on the territory of Belarus were investigated through claculation and ...
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(2006)Xenoliths hosted by Quaternary basanites and alkali basalts from Marsabit (northern Kenya) represent fragments of Proterozoic lithospheric mantle thinned and chemically modified during rifting in the Mesozoic (Anza Graben) ...
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(1990)While studying rocks and minerals in the central part of the Sushchany-Perzhanskaya tectonic zone at the northwest periphery of the Ukrainian shield, we found jacobsite in a geologically unusual situation, i.e., in the ...
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(1989)The structures, the geologic positions, the petrography, and the compositions and the geochemical specializations of the ongonite, granite-porphyry, quartz-porphyry, and altered granite dikes of the Yekaterinovskiy pluton ...
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(1989)In 1978, in Precambrian metamorphosed bauxites of the Alag Uula deposit, we found a mineral identified as gibbsite high in copper and magnesium. This deposit is in western Mongolia in the eastern part of the Yihe Daribi ...
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(1988)Ultramafic rocks in the Precambrian sequence of the Eastern Sayan were traditionally classified as plutonic. Within the Khan-Ashkasok synclinorial trough of Early Proterozoic age studied by us, such rocks were mapped as ...
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(1987)Carbonate concretions yield the most data for reconstruction purposes because they are compositionally very diverse and have compositions very similar to those of the physicochemical medium in which they were formed. The ...
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(1995)The Early Proterozoic Imandrovsky (Kola Peninsula) and Lukkulaisvaara (northern Karelia) layered intrusions host various platinum-group element (PGE) deposits. The PGE-bearing chromitite horizon is located in the Lower ...
Now showing items 21-40 of 188