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Browsing ELibrary by Title
Now showing items 5259-5278 of 22924
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(2003)The Verkhnyaya Unda granitoid batholith is the largest pluton of the Later Paleozoic Unda complex prevailing among the granitoids of Eastern Transbaikalia. The geology and geochemistry of this batholith is examined in ...
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(2006)Dyke swarms traverse Neoproterozoic rocks in the Hawashiya region in the extreme northern part of the Eastern Desert of Egypt. They are a suite of basaltic andesite and andesite mafic dykes, and dacitic and rhyolitic felsic ...
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(1997)Lead isotope data from geologically mixed suites of Archaean gneisses often yield secondary isochrons that have statistically better fits than might be expected from the geological constraints on the range of samples used. ...
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(1989)The theoretical possibility of using stable isotopes for geochronological purposes, based on the kinetics of isotope exchange reactions, was demonstrated in a study of the distributions of the isotopes of light elements ...
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(2004)The available geochronological data indicate three evolutionary stages of alkaline-mafic magmatism in Kuznetsk Alatau (Cambrian-Ordovician, Early-Late Silurian, and Silurian-Devonian boundaries). These data support the ...
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(1994)U–Pb zircon/baddeleyite ages obtained for the Korosten anorthosite-rapakivi granite complex, Ukrainian shield, suggest that different magmatic phases were emplaced during a period of ca. 30 million years as a series of ...
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(2006)The Legs Lake shear zone marks the southeastern boundary of an extensive region (>20,000 km2) of high-pressure (0.8–1.5+ GPa) granulite-facies rocks in the western Churchill Province, Canada. The shear zone is one of the ...
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(2001)U–Th–Pb analyses of zircons from six granites and one metasediment collected in the accretionary Central belt of Taimyr, Arctic Siberia, demonstrate that Neoproterozoic (c. 900 Ma) granites intrude late Mesoproterozoic/early ...
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(1990)The deposition of apatite in the past was preceded and promoted by numerous factors, chief among which were tectonic factors (endogenous conditions) and igneous and metamorphic factors. Thus, on tectonically stable structures, ...
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(2002)A problem of modifying the International stratigraphic scale is discussed, and the present state of the Phanerozoic geochronological scale is analyzed. It is suggested that both scales reflect a combined response of the ...
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(2006)Individual grains of zircon from the Archean Kostomuksha, North Karelian and Matkalakhta greenstone belts, which are situated respectively in western, northern and eastern Karelia, are studied using the ion microprobe ...
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(2004)A subject of discussion is age of rocks in Mesozoic volcano-plutonic belts of the epi-Paleozoic Amurian superterrane. Mesozoic volcanic and intrusive complexes of the northeastern Greater Khingan and western Umlekan-Ogodzha ...
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GEOCHRONOLOGY AND FORMATION SUBDIVISIONS OF THE LOWER PRECAMBRIAN IN THE NORTHWESTERN LADOGA REGION (1996)A brief geological review of the northwestern Ladoga region and systematics of the Lower Precambrian subdivisions in this territory are presented. The respective stratigraphic scale and supplementary geologic scheme include ...
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(2006)Mesozoic volcanic rocks section in Manzhouli Xinyouqi, Inner-Mongolia is mainly composed of trachy-andesite, trachyte and rhyolite 40Ar-39Ar dating of lower section trachy-andesites and middle section rhyolites give a ...
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(2000)Simultaneous in-situ analysis of U-Pb age and 26 trace elements for single-grain zircon using the LAM-ICPMS technique was successfully achieved in this study. The precision of analysis is 1 to 3 % for 207Pb/206Pb isotopic ...
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(2006)The radioactivities of 210Pb and 137Cs have been measured to estimate the dates of the sediments of a surface core (QH0407-C-2) in the northern basin of Lake Qinghai. The sedimentation rate derived from 210Pb radioactivity ...
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(2002)The Valley of Lakes, Mongolia, is a key region in which to elaborate the geochronology of biostratigraphic horizons of the continental Paleogene and Neogene. Here, basaltic volcanism is developed widely. Basalt flow units ...
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(2004)The epiplatform (Upper Cretaceous-Paleogene) and neotectonic (Neogene-Quaternary) evolutionary stages and morphostructures are distinguished in Mongolia. The neotectonic structures are characteristic of the orogenic zone ...
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(1998)Monazite grains are generally concordant and, with an electron microprobe, give Th-U-total Pb isochron ages in agreement with conventional U-Pb data. Monazites from four samples of post-Archean migmatite from the Ivory ...
Now showing items 5259-5278 of 22924