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Browsing ELibrary by Title
Now showing items 6945-6964 of 22769
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(2004)We have determined the stability of rutile and karrooite on the liquidus of pseudobinary silicate melts of anorthite–diopside eutectic composition with, in addition, of up to 32wt% TiO2 at one atm total pressure and at ...
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(2004)CaO-rich, Al2O3-poor ultracalcic primitive melts occur at mid-ocean-ridges, back-arc basins, ocean islands and volcanic arcs. They are subdivided into a “nepheline-normative” alkaline-rich, silica-poor group uniquely found ...
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LITHIUM AND ITS ISOTOPES IN MAJOR WORLD RIVERS: IMPLICATIONS FOR WEATHERING AND THE OCEANIC BUDGET (1998)The outstanding problem in the lithium geochemical cycle is the lack of an isotopic mass balance in the ocean. The δ6Li compositions of fresh basalts (−4‰), the hydrothermal fluids derived from them (average −9‰), and ...
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(2003)Lithium is an important constituent in amphiboles, where it can be incorporated up to a limit of three atoms per formula unit (apfu). Lithium can partition itself between the B-group sites (where it occurs at the [6+2] ...
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(2005)The fractionation of lithium isotopes among quartz, muscovite, and a chloride-bearing aqueous fluid has been investigated experimentally at 400°–500°C and 50–100 MPa. Experiments were performed for 15–60 days in cold seal ...
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(2004)The Li isotopic composition of the upper continental crust is estimated from the analyses of well-characterized shales, loess, granites and upper crustal composites (51 samples in total) from North America, China, Europe, ...
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(2004)We determined the Li isotopic composition of coexisting olivine, clinopyroxene, and orthopyroxene from spinel- and garnet-bearing peridotite xenoliths from San Carlos (Arizona), Vitim (Siberia), Dreiser Weiher (Eifel, ...
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LITHIUM ISOTOPIC SYSTEMATICS OF THE MANTLE-DERIVED ULTRAMAFIC XENOLITHS: IMPLICATIONS FOR EM1 ORIGIN (2004)Isotopic signatures of mantle-derived xenoliths have provided much information on the evolution of their mantle source regions. A recently developed multiple-collector inductively coupled plasma mass spectrometry method ...
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(2004)The composition of Aptian–Albian rocks in the western Ciscaucasus is considered. Their lithofacies features and formation conditions are established. The data obtained can be used to determine the mineralogical potential ...
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(2004)Implications of ion exchange processes for the formation of lithological and hydrogeochemical systems under various thermobaric conditions of the subsurface hydrosphere are discussed on the basis of on-location, experimental, ...
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(2004)Based on traditional petrochemical and nontraditional mineralogical methods (accessory zircon generation analysis), specific features of the primary composition of strongly metamorphosed rocks from some Early Precambrian ...
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(2004)Upper Cambrian-Lower Ordovician volcanic-siliceous-terrigenous strata of the Zasur'ya Group belonging to the Gorny Altai segment of the Paleo-Asian Ocean are considered in this paper. The Gorny Altai segment developed over ...
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(1997)Using ferromagnetic resonance (FMR) and instrumental neutron activation analysis (INAA), we have determined the maturity (surface exposure) parameter Is/FeO and concentrations of twenty-five chemical elements on samples ...
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(2001)The complex study of uranium ores and their host rocks of the Malinovskoe deposit revealed their specific mineralogical and geochemical peculiarities, which it differentiate them from all known ancient and recent exogenic ...
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(2001)The recent decades have become a "golden age" for lithology and marine geology. The principal achievements include investigation and mapping of oceanic bottom sediments and studies of the sedimentary material in the ...
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(1987)The paper reports on a study of the texture and mineral composition (including the distribution of various trace elements) of a complex mantle xenolith, containing apatite and mica. This xenolith was found in the northern ...
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(2000)Offered in this paper is the critical analysis of the modern experimental results and theoretical views for the mechanisms of the lithosphere-ionosphere connection, cased by seismic activity at the final stage of earthquake ...
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(2002)A three-dimensional (3D) density model, approximated by two regional layers—the sedimentary cover and the crystalline crust (offshore, a sea-water layer was added), has been constructed in 1° averaging for the whole European ...
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(2004)The southern segment of the seismic profile EUROBRIDGE—EUROBRIDGE-97 (EB'97)—located in Belarus and Ukraine, crosses the suture zone between two main segments of the East European Craton—Fennoscandia and Sarmatia—as well ...
Now showing items 6945-6964 of 22769