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Browsing ELibrary by Title
Now showing items 4836-4855 of 21768
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(2000)The major and trace element and Pb–Sr–Nd isotopic compositions of Quaternary mafic lavas from the northern Ryukyu arc provide insights into the nature of the mantle wedge and its tectonic evolution. Beneath the volcanic ...
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(1988)The europium minimum often observed in Archean ultramafic and mafic rocks reflects both the effect of protomagmatic processes (fractional crystallization, accompanied by removal of feldspars and clinopyroxene from the ...
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(1999)Isotopic and geochemical data of the Zerenda series metamorphic rocks from the Kokchetav massif are reported. Some of these rocks contain microdiamond inclusions in garnets and other indicators of ultrahigh pressure ...
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(2003)Under consideration is the geological and geochemical signature of the granitoid rocks (from gabbro to leucogranite) making up a large Early Paleozoic batholith of the Kuznetsk Alatau. The early (progressive) stage of ...
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(2004)The composition of rock-forming minerals was analyzed and the crystallization conditions of phe-nocrysts were evaluated for the Paleozoic alkaline volcanic rocks from the Southern Ural, where these rocks are combined in ...
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(2001)Three samples of cryptocrystalline diamond aggregates (carbonado) from Yakutian deposits were determined, with the use of analytical transmission electron microscopy, to contain micron-sized inclusions of native Fe, Cr, ...
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GEOCHEMISTRY AND GENESIS OF DEEP-SEATED ARCHEAN ENDERBITES IN THE SUTAM BLOCK, SOUTHERN ALDAN SHIELD (2001)The stratigraphic bottom of the deep-seated Sutam granulite complex is demonstrated to consist of a stratified metabasite-enderbite formation. Regularities in the distribution of major and trace elements indicate that the ...
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GEOCHEMISTRY AND GENESIS OF MONZONITOIDS OF THE DZHALTUL TRAP INTRUSION, NORTHWEST SIBERIAN PLATFORM (1998)It has been established that the acid rocks in the northwest of the Siberian Platform, earlier recognized as an independent granitoid formation, are related to formation of the unique Dzhaltul trap intrusive (DI) famous ...
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(2004)The 1.8 Ga dyke swarms in the North China Craton are among the largest ones in China. In the juncture of Shanxi, Hebei, and Inner-Mongolia, they presented as NNW and EW-oriented vertical to subvertical dykes with chilled ...
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(2003)The geochemistry of brines typical of the Solikamsk Depression (a basin of the Uralian Foredeep) is studied. Strong calcium chloride brines with a salinity of up to 300 g/l are dominant in the Paleozoic sedimentary cover. ...
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(2001)New data arc discussed on the major and trace element chemistry of vein albitites and quartz albitites of the zoned Alaskan-type Epilchik dunite-clinopyroxenite-gabbro massif. The vein leucocratic rocks of the massif are ...
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(2003)In the sampled section by Nizhnyaya Katanda river the Uimon series is represented by a package of tectonic plates composed primarily from metabasites, metagraywackes, quartzites with piedmontite and spessartite, shallow ...
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(2003)The basement of the Early Proterozoic Pechenga paleorift was penetrated by the Kola Superdeep Borehole at depths from 6842-12261 m. The main types of basement rocks are gneisses of dacite-plagiorhyodacite (tonalite-trondhjemite) ...
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(2003)The spent nuclear fuel (SNF) stored in underground repositories should be isolated from groundwater attack by engineered barriers for 500-1000 years. The short- and medium-lived radionuclides will decay in this period, and ...
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(2001)Agate samples of acidic, intermediate and basic volcanics from 18 localities around the world and of different age (Precambrian to Tertiary) were studied by trace element and stable isotope analysis to provide information ...
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(1987)The authors studied the geochemistry of the geologically best surveyed northern part of the Il'men-Vishnevogorsk belt of alkalic rocks, i.e., the Vishnevogorsk complex, at three different erosion levels - near its roots ...
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GEOCHEMISTRY OF ALUMINOUS PLAGIOGNEISSES: THE ORIGIN OF KYANITE-BEARING ROCKS OF THE BELOMORIAN BELT (2004)Geochemical features (including REE contents) are studied for many samples of fine-grained massive ("dry") aluminous plagiogneisses, which occur as relics among the migmatized and granitized varieties in different parts ...
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(2001)Petrological, geochemical, and geochronological data for the basic-ultrabasic rocks of the Bulun block from the Sharyzhalgai uplift are reported, and the age and geodynamic environments of these geologic structures are ...
Now showing items 4836-4855 of 21768