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Browsing ELibrary by Title
Now showing items 12266-12285 of 21936
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(2001)This paper presents a revised chemical purification method of Hf for the measurement of Hf isotope ratios of Fe-Mn crusts on a new generation of double focusing multiple collector plasma source mass spectrometer (MC-ICP-MS).By ...
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(1997)We present Hf and Pb isotopic data, and chemical compositions of the outermost layers of marine ferromanganese deposits of different types (hydrogenous and hydrothermal) with a worldwide distribution. The Hf isotopic ...
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(2004)This chapter discusses ancient ice-marginal positions that are scattered throughout the high regions of Asia. This represents equilibrium line altitude (ELA) depressions of more than 1000m and indicates, locally, a glacial ...
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(1992)Cenozoic volcanic rocks sampled during the 1989 Sino-French Kunlun geotraverse have been analyzed to constrain the origin of widespread Tertiary to Neogene Tibetan basic magmatism. Samples ranging from phonotephrites to ...
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(2002)The stability of the high-pressure phase Mg-sursassite, previously MgMgAl-pumpellyite, in ultramafic compositions has been determined in experiments in the system MgO-Al2O3-SiO2-H2O (MASH). The breakdown of Mg-sursassite ...
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(2004)The in-situ high-pressure structure of natural kaersutite, obtained from the mantle xenolith in alkali basalt of southwestern Tianshan in Xinjiang, has been studied using synchrotron radiation energy dispersive X-ray ...
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(2003)An in situ, high-temperature, powder diffraction investigation was performed for iron-free clinopyroxenes with compositions Ca0.40Mg1.60Si2O6, Ca0.52Mg1.46Al0.05Si1.98O6, Ca0.59Mg1.41Si2O6 and Ca0.70Mg1.30Si2O6, up to 850 ...
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(1996)Field relations in dissected volcanic terrains and the internal evidence of persistent low-pressure cotectic character in erupted basalts point to the frequent and substantial modification of liquid compositions by some ...
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(2001)Coesite eclogites and diamond-bearing ultrahigh-pressure (UHP) metamorphic rocks along ancient plate boundaries were mostly derived from quartz-and carbonate-bearing rocks originally formed close to the earth's surface. ...
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(2003)The Hisovaara structure in the northern Karelian greenstone belt includes two complexes of metamorphosed magmatic rocks different in age and composition. The earlier of them comprises metamorphosed tholeiites, boninites, ...
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(2001)Jurassic and Cretaceous ichthyosaurs revealed changes in the family and subfamily composition in Stenopterygiidae and Ichthyosaurinae (Lias), Ophthalmosaurinae and Stenopterygiidae (Bajocian-Kimmeridgian), Undorosaurinae ...
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(1998)Changes in composition of planktonic foraminifers in nine cores of bottom sediments obtained from different areas of the Sea of Okhotsk were analyzed in order to reconstruct the history of climate and circulation of the ...
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(2001)Late Miocene and Early Pliocene three-toed jerboas from Mongolia, Tuva, Kazakhstan, and the southern part of Western Siberia are investigated. The earliest members of the genera Dipus, Stylodipus, Plioscirtopoda, and Jaculus ...
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(2002)The Late Miocene and Early Pliocene Asiatic Lophocricetinae (Dipodidae) are studied. Ten species, including Heterosminthus saraicus sp. nov. (MN12) and Lophocricetus (Paralophocricetus) progressus subgen, et sp. nov. (MN14) ...
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(2002)Two new lophocricetine genera from the Mio-Pliocene of the southern part of Western Siberia and Kazakhstan are established. Sibirosminthus gen. nov. includes four species, which are characterized by large sizes and clearly ...
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(2002)Bottom deposits of four lakes in the central part of Buryatia (51-54°N, 106-112°E) were subjected to the pollen and radiocarbon analyses. The data obtained elucidate development of regional and local Holocene vegetation ...
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(2001)The stable isotope and trace element geochemistry of ostracode shells from Lake Issyk-Kul, Kyrgyzstan, provide an important new paleoclimate record for central Asia. The δ18O, δ13C, Sr/Ca, Mg/Ca and U/Ca composition of ...
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(1998)The studied objects represent the lacustrine bottom deposits in the southeast of the Kola Peninsula and the peat bed in the Cape Rybachii, exemplifying the northernmost occurrence of this substance in the European part of ...
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(2001)The bio- and lithostratigraphy of the poorly known early Ordovician (Arenig) Hunneberg Stage is described from the area east of St. Petersburg (Putilovo Quarry and Lava river), where the Lakity Beds (Leetse Fm.) consist ...
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(2002)Major ion, silica and pH data from a high Arctic proglacial stream network are examined. Factor analysis shows that the major controls upon hydrochemistry in the basin include snowpack solute elution, rapid alteration of ...
Now showing items 12266-12285 of 21936