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Browsing ELibrary by Title
Now showing items 7252-7271 of 21821
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(2000)X-ray diffraction (XRD), Rb-Sr isotope analysis, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and Fourier transform infrared (FTIR) methods were used to study diagenetic illite and ...
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(2003)The profile of the supergene zone of the Zapadno-Ozernoe massive sulphide Cu-Zn deposit differs from the classic model (Emmons, 1917) in that it includes a prominent dark sooty subzone rich in secondary sulphides. This ...
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(1999)We report the results of oxygen isotopic analyses made on mineral separates prepared from chondrules and whole meteorites (UOCs). Feldspar/glass (mainly chondrule mesostasis) is more 16O-poor than the olivine/low Ca pyroxene ...
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(2002)The response of carbonate-bearing sediments to transient shock waves is important in understanding atmospheric CO(2) pollution caused by large-scale impacts on Earth. As a consequence, we examined polycrystalline dolomite ...
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(2001)В реликтовом сульфидном холме и в рудокластических отложениях Северной залежи Александринского медно-цинково-колчеданного месторождения обнаружены многочисленные фрагменты запечатанных сульфидных труб. По составу оболочки ...
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(1996)The paper presents data on a new fumarolic mineral (aqueous Al-Ca chloride-sulfate) discovered on Tolbachik Volcano eruption in 1975-1976. The mineral has no analogs among natural and synthetic compounds. It was examined ...
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MINERALOGY AND GENESIS OF "ALLUVIAL PLATINUM" FROM PLACERS OF THE SOUTHERN KORYAK HIGHLAND (RUSSIA) (2002)Analogues of Uralian platinum-metal placers were discovered in the southern Koryak Highland of Russia in the last decade. Until recently, the most promising are valley and terrace alluvial placers of platinum metals located ...
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(1994)The apatite-magnetite ores within the Tomtor Massif have been known since 1975. Our predecessors (E. N. Ehrich, G. I. Porshnev, L. S. Egoroy, et al.) have revealed the Onkuchakh deposit, studied the morphology, genesis, ...
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(1998)Minor magmatic intrusions of kimberlite, melilitite and cpx-melilitite occur in the southern part of the Kola Peninsula, Russia, on the Terskii Coast and near the town of Kandalaksha. They yield K-Ar ages of 382 ± 14 Ma ...
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(1989)The determination of the composition of primary melts is one of the most important steps in the analysis of the evolution of basaltic magmas of different series. The high magnesian lavas occur in central and top parts of ...
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(2004)The mantle column structure has been defined only for the Udachnaya [1] and Mir [2] kimberlite pipes of the Siberian Platform. Peridotite xenoliths are generally serpentinized. However, their concentrate contains not only ...
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(1992)New INAA data for 35 bulk samples of metamorphic rocks, granites and pegmatites, together with some results of previous investigations of minerals containing REEs (allanite, betafite, euxenite, garnet and titanite) are ...
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(2004)The eastern part of the agpaitic Khibina complex is characterized by the occurrence of dykes of various alkali silicate rocks and carbonatites. Of these, picrite, monchiquite, nephelinite and phonolite have been studied ...
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(2001)The aim of this paper is to analyze and compare the mineralogy and geochemistry of copper–zinc sulfide ores from the Logachev-2 and Rainbow hydrothermal fields of the Mid-Atlantic Ridge (MAR), confined to serpentinite ...
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(2001)Processes of mineral alteration involving the mobilization and deposition of more than 30 chemical elements during bauxite formation and epigenesis have been studied on specimens from the Devonian Schugorsk bauxite deposit, ...
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(2003)The carbonate-rich lithology of the Tagish Lake carbonaceous chondrite was characterized by noble-gas mass spectrometry, synchrotron X-ray diffraction analysis, and transmission and scanning electron microscopy. Noble-gas ...
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(1999)Spontaneous burning in the largest spoil heaps of the Chelyabinsk coal basin led to high-temperature conditions (1000-1300°C). At these parameters, Fe-rich basic liquids resulted from the complete melting of a fine-crushed ...
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(2002)Petrographic and mineralogic studies of amoeboid olivine inclusions (AOIs) in CO3 carbonaceous chondrites reveal that they are sensitive indicators of parent-body aqueous and thermal alteration. As the petrologic subtype ...
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(2000)This study of minerals from the Late Cretaceous potassic volcanic rocks of the Kirganik Suite from the Sredinnyi Range of Central Kamchatka provided a basis for affiliating these rocks with two series: (1) a plagioclase ...
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(2002)The late Eocene Popigai impact structure of Siberia comprises an approximately 0.5–1.5 km thick, ˜100 km diameter sequence of clast-rich and clast-poor andesitic to rhyolitic impact melt rocks and impact breccias, underlain ...
Now showing items 7252-7271 of 21821