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Browsing ELibrary by Title
Now showing items 12073-12092 of 21638
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(2004)On the western slope of the Southern Urals, a continuous conodont zone sequence within different facies of the Frasnian-Famennian (F-F) boundary beds is documented. In all the sections the boundary between both stages runs ...
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(1986)If crustal material (including water in oceanic areas) is compressed to the mean density of the subcrustal layer, the surface of the body can be considered as a free mantle surface (FM)). Joint analysis of FMS and of gravity ...
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(2004)The properties of compound chondrules and the implications that they have for the conditions and environment in which chondrules formed are investigated. Formulae to calculate the probability of detecting compound chondrules ...
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(2004)In seismic imaging experiments, it is common to use a geometric ray theory that is an asymptotic solution of the wave equation in the high-frequency limit. Consequently, it is assumed that waves propagate along infinitely ...
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(2001)The soft-body anatomy of helcionellids is reconstructed on the basis of a morphofunctional analyses of their shells. Evidently, two systems for the internal organization of helcionellids are possible: the first corresponds ...
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(2003)The I bar, thermodynamic properties of crystalline and liquid NaAlSi308 are used to calculate the fusion curve of albite to 10 kbar. The calculated temperatures (± 2sigma) of the melting reaction are 1152 (± 7) degrees C ...
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(1987)The criterion for fracture propagation suggests that the primary magma generated in the mantle ascends in a stepwise fashion. Initially a pulse of magma forms a dyke above the mantle source and ascends for some distance, ...
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(1997)The generation of a ~ 50-500 times more viscous and 1-2% less dense depleted restite layer by melting and melt extraction beneath a mid-ocean ridge can be a significant barrier to subsequent off-axis upwelling and melting. ...
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(1999)Observations of natural eruption products show that different parts of a single magma batch may experience different degassing histories during ascent in a volcanic conduit. In non-explosive eruptions, lava issuing from a ...
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(1988)When basalt magmas are emplaced into continental crust, melting and generation of silicic magma can be expected. The fluid dynamical and heat transfer processes at the roof of a basaltic sill in which the wall rock melts ...
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(1998)Evidence of magma mixing is common in the products of explosive felsic eruptions and it is generally accepted as a common mechanism for triggering such events. In order to quantify the potential for magma mixing to trigger ...
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(2003)In the last decade, significant progress has been made toward understanding how plate tectonics is generated from mantle dynamics. A primary goal of plate-generation studies has been the development of models that allow ...
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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 ...
Now showing items 12073-12092 of 21638