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Browsing ELibrary by Title
Now showing items 12226-12245 of 21936
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(2004)Analogue and computational models principally provide our present understanding of the mechanisms of prograde metamorphism and orogenesis, yet, due to the difficulty of linking prograde age information with the ...
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(1999)We have determined δ18O in 120 chemically well-documented samples of lavas characteristic of the major areas and types of volcanism, most of which Quaternary in age, from the subduction zone volcanism in the Kamchatka ...
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(2004)The majority of researchers believe that epithermal deposits form in near-surface (300--500 m) and low-temperature (50--200oC) conditions from hot solutions in open fissures. The facts that have been accumulated to date ...
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(2001)The validity of the genus Acrostichides Fontaine is argued on the basis of the material from the uppermost Permian of Siberia and the Triassic of China and Iran. The genus and species diagnoses are emended.
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(1997)Representatives of the genus Danocrania Rosenkrantz 1964 from the Danian stage in the Crimea are presented, and the distinguishing features of this genus are described. Seven morphological types of brachiopods belonging ...
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(1985)Using hygromagmatophile element abundances (normalized to primordial mantle composition), it is possible to discriminate between the tectonic settings of tholeiitic basalts and basaltic andesites (47.0–53.5% SiO2). Based ...
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(2004)The rare earth elements (REEs) have been used as analogs for understanding the behavior of actinide elements in geological conditions. Here the authors discuss the usefulness of the change of Eu abundance in a fractured ...
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(2006)The regolith of the Apollo 16 lunar landing site is composed mainly of feldspathic lithologies but mafic lithologies are also present. A large proportion of the mafic material occurs as glass. We determined the major element ...
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(1985)The total concentration of I is commonly higher in surface terrigenous sediments relative to more deeply buried material. Diagenetic release, loss of dissolved I during burial, and back-reaction of I with the solid phase ...
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(2006)Using the results of geological mapping, including the petrostructural and petrochemical data, available, as well as the results of the previous researchers, a composite characteristic is offered for the geologic structure ...
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(2002)Subsidence mechanisms that may have controlled the evolution of the eastern Black Sea have been studied and simulated using a numerical model that integrates structural, thermal, isostatic and surface processes in both ...
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(1999)The late-Paleozoic Uralides represent one of the largest lode-gold metallogenic provinces in the world. In the southern Urals, gold distribution is heterogeneous and is confined mainly to two tectonostratigraphic zones, ...
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(2001)The Kola-Kanin Monocline has been recently recognized as a potentially prospective region for hydrocarbon discoveries. There may be good generating potential within Riphean grabens. Sedimentary sequences of the Riphean ...
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(2001)The turnover of water and 18O in the outer terrestrial sphere is investigated considering mantle degassing, subduction zone processes, hydrothermal circulation at spreading centers, seafloor alteration, and continental ...
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(2001)The turnover of water and 18O in the outer terrestrial sphere is investigated considering mantle degassing, subduction zone processes, hydrothermal circulation at spreading centers, seafloor alteration, and continental ...
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(2000)The Udokan deposit is unique in the reserves of copper and ordinary in its content in ores, averaging 1.56 %. The ores are Lower Proterozoic cupriferous sandstones of the upper-Sakukan Subformation, which is part of the ...
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(2001)The North Afghan platform has a pre-Jurassic basement unconformably overlain by a Jurassic to Paleogene oil- and gas-bearing sedimentary rock platform cover, unconformably overlain by Neogene syn- and post-orogenic continental ...
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(2001)Aluminium phosphates and sulphates of the alunite supergroup (APS minerals) occur in a wide range of environments of formation covering the metamorphic, igneous and sedimentary realms. Supergene processes, including mineral ...
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(2000)The Baltic Sea, particularly its southeastern part, is discussed in the paper. Investigations of regional character as well as specialized studies in the area are reviewed. General historical works are mentioned briefly. ...
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(2002)The geomagnetic control concept relates F2-layer parameter trends with long-term variations of geomagnetic activity and allows one to explain both foF2 and hmF2 trends consistently. Periods with negative and positive trends ...
Now showing items 12226-12245 of 21936