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Browsing ELibrary by Title
Now showing items 7232-7251 of 21768
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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 ...
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(2002)The carbonate biominerals formed in the oogonial cells and on stems of charophytes reveal intra-specific and species-to-species variations within the genus Chara. Calcite, high-magnesian calcite (HMC) and aragonite may be ...
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(2001)We characterized the most As-rich natural hydr ous ferric oxide (HFO) material ever reported using powder X-ray diffraction (pXRD), transmission electron microscopy (TEM), X-ray fluores- cence spectroscopy (XRF), light ...
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(1995)The Krymka chondrite contains an exotic graphite-bearing fragment that appears to be of a new type of material added to unequilibrated LL-chondrite during agglomeration on the surface of the parent body. The fine-granular ...
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(1987)Mineralogical and crystallographic data and electron microprobe analyses of silicate minerals for Antarctic ureilites Y74123, Y74130, Y74659, Y790981, ALHA77257, ALHA78019 and ALH82106 extend the chemical and textural ...
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(2003)Seventy-one carbonaceous chondritic microclasts of average size 150 μm have been found in three howardites (Yamato-793497, Jodzie, Kapoeta). All carbonaceous chondritic microclasts are made of a fine-grained phyllosilicate-rich ...
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(1998)Cumulus olivine, clinopyroxene, melilite and perovskite from silicate rocks and carbonatites of the Gardiner (East Greenland) and Kovdor (Kola Peninsula) ultramafic alkaline complexes contain primary melt inclusions ...
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(2004)The paper contains results of a comprehensive study of the mineralogy and physical properties of diamonds, including results of IR and UV spectroscopy, EPR spectroscopy, x-ray luminescence, carbon isotopic composition, and ...
Now showing items 7232-7251 of 21768