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Now showing items 12077-12096 of 39126
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(2002)In order to elucidate evolutionary paths for the alkaline ultramafic series of the Kola province, we studied distribution of rare earth elements (REE) in rocks and constituent minerals of the rock sequence dunite, ...
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(PANGAEA, 1970-02-09)
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(1990)Analysis of the distribution of REE in the rocks of the Geranskiy pluton suggests the following: 1) in comparison with anorthosites of autonomous type in other regions [9, 11], the rocks of the Geranskiy pluton differ in ...
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(2004)The REE distribution in zonal metamorphic minerals (garnet, amphibole, and clinopyroxene) was studied on an ion microprobe. Zoning of the metamorphic garnets indicates that the HREE contents increase and LREE contents ...
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(2002)During the Devonian magmatism (370 Ma ago) ∼20 ultrabasic-alkaline-carbonatite complexes (UACC) were formed in the Kola Peninsula (north-east of the Baltic Shield). In order to understand mantle and crust sources and ...
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(2004)Using the best estimates of rare gas isotopic ratios for both Oceanic Island Basalts (OIB) and Mid Oceanic Ridge Basalts (MORB) sources, and knowing the incompatible element ratios between these two sources (e.g. K, U), ...
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(Федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет», 2018)This article is dedicated to the rare metal mineralization of stanniferous metasomatites of the Verkhneurmiysky ore cluster in the Far East of Russia. The mineral composition of metasomatites, formed during the five stages ...
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(2001)Gold occurring in the platinum placer of the Konder alkaline-ultrabasic massif is represented by the following varieties: copper gold (6.9-25.0 wt % Cu; single grain with 44.3 wt % Cu)-Au3Cu (cuproauride), AuCu (tetraauricupride), ...
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(1998)W-bearing magmatic complexes of the southern Tien Shan are distinguished from one another by the depths of magma sources and their composition, which are made up of metasomatically enriched mantle, primitive or depleted ...
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(1997)Diffusion rates for three rare-earth elements (REEs: Sm, Dy, Yb) have been measured in synthetic and natural zircon. REE-phosphate powders were used as the source of diffusant, with Rutherford backscattering spectrometry ...
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(1989)While studying alkalic rocks of the Lower Sayan pluton, we were able to establish several geologically and geochemically important features which allowed us to take a new look at ijolite and its part in carbonatite-forming ...
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(1988)Apatite is one of the most widespread accumulator minerals of rare-earth elements (REE) in igneous rocks. We have obtained the first data on the REE concentration and distribution in accessory apatites of igneous rocks and ...
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(1990)Diorite-granitoid plutons are among the principal structural components of continental orogenic belts but are considerably less widespread on present island arcs. On Urup Island, chiefly on its Pacific side, there are five ...
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(1987)The rocks produced in the Quaternary cycle of volcanism in the GVTS (Gamchen Volcanotectonic Structure) can be subdivided into three phases, each representing a volcanic regeneration phase in the region: early Pleistocene ...
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(1991)The redox boundary for temperatures up to 600°C and pressures up to 4000 bar has been calculated using the “revised HKF model” for the prediction of the molal Gibbs free energy of formation at elevated pressures and ...
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(1989)Apatite in apatite-bearing conglomerates previously described from Precambrian metamorphic complexes of the Aldan shield occurs as an accessory mineral in the cement and pebbles. In this article, we have estimated the role ...
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(1988)Plateau basalts of the Siberian craton, of which the basalts of the Putoran Plateau in the northern part of the Tunguska syneclise constitute a sizable part, are a representative province of cratonic tholeiite magmatism. ...
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(2001)Neutron-activation analysis with the use of the X-ray fluorescence method permitted us to determine a number of rock-forming and trace elements in the samples of atmospheric aerosol collected on air filters and in snow ...
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(2001)The distribution of REE was analyzed in granites from massifs of the Ikh-Khairkhan tungsten mining district and in muscovite and fluorite from metasomatic rocks and mineralized zones of the Ikh-Khairkhan deposit in central ...
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(1989)Basalt flows which cover ancient platforms and are part of trap formations are typical examples of continental intraplate magmatism. In recent years, they have attracted a great deal of attention from investigators, because ...
Now showing items 12077-12096 of 39126