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Browsing by Title
Now showing items 12517-12536 of 39126
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(2004)This study investigates the magnetic behavior of three well-characterized synthetic single-phase ferrian ilmenite (y = 0.7) specimens over the temperature range between 10 K and 573 K. Careful experiments measuring induced ...
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(2005)Are the rare earth elements (REEs) in foraminifera a valuable proxy for use in paleoceanographic and climate change studies? In order to investigate this, we attempted a comprehensive study of REEs in planktonic and benthic ...
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(1997)We have examined the systematics of Re abundances in concert with new and published data on major and trace elements in oceanic basalts. Re abundances in MORB average 927 ppt (parts per trillion), a factor of 2.6 higher ...
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(1996)The trace elements Re and Mo both behave conservatively in seawater yet are strongly enriched in reducing sediments. Their potential for authigenic enrichment above crustal concentrations is greater than for many other ...
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(1995)Rhenium concentrations were measured in the Black Sea to determine the behavior of this redox-sensitive element in an anoxic basin. Under reducing conditions, Re is removed from solution, leading to its depletion from Black ...
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(2001)Rhenium is found in a great deal of occurrences in the Kuril Islands, apart from the known occurrence at the Kudryavyi volcano. Rhenium mineralisation is located both in the upper parts of the ore-magmatic systems with ...
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(2001)The Re-Os isotopic systematics of calcium-aluminium-rich inclusions (CAIs) in chondrites were investigated in order to shed light on the behavior of the Re-Os system in bulk chondrites, and to constrain the timing of ...
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(2001)This study investigated the rheological and microstructural evolution of Carrara marble deformed to large shear strain to understand how dynamic recrystallization and lattice-preferred orientation (LPO) are related to ...
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(2003)The vesiculation of the rising magma in a volcanic conduit results in a large change in the viscosity of magma. Understanding the effect of bubbles on the viscous behavior of bubble-melt mixtures over a wide range of bubble ...
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(2001)Four different thermo-kinematic models for the tectonic evolution of the convergence zone of the Eastern Carpathians are studied, in which processes like the pre-collisional subduction of an oceanic lithosphere, the ...
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(2004)Lherzolite samples synthesized from fine-grained powders prepared from a natural xenolith were deformed at P = 300?MPa and 1373 ? T ? 1573?K in a high-resolution gas-medium deformation apparatus. Below and above the solidus ...
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(1995)Numerical simulations of mantle convection with a composite temperature-dependent, Newtonian and non-Newtonian creep law have revealed a transition in the dominant creep mechanism with the increasing vigour of convection. ...
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(1998)High-grade igneous and metamorphic systems which possess a variable percentage of melt, may undergo a transition between crystal-supported and fully fluid behavior. The melt-fraction interval over which this transition ...
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(1996)We consider the rheological behaviour of felsic magma in the zone of partial melting and during subsequent crystallization. We also introduce and combine concepts (mushy zone, percolation theory, granular flow, shear ...
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(2001)The application of continuum mechanics and microstructural analysis to geological studies over the past 30 years has spurred earth scientists to reassess fundamental tectonic processes such as subduction, collision and ...
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(1999)The physical effects of air or argon bubbles on the rheology of a calcium aluminosilicate melt have been measured at temperatures ranging from 830° to 960°C, at 1 bar pressure. The melt composition is SiO2:64, Al2O3:23, ...
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(2003)Considerable progress has been made over the past decade in under-standing the static rheological properties of granitic magmas in the continental crust. Changes in H 2 O content, CO 2 content, and oxidation state of the ...
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(2001)Triaxial compression testing of pure, polycrystalline water ice I at conditions relevant to planetary interiors and near-surface environments (differential stresses 0.45 to 10 MPa, temperatures 200 to 250 K, confining ...
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(2000)Reactivation and tectonic inversion are the result of the interactions between changes in the stress field and the rheological properties of the lithosphere. The rheology varies in time and space as a function of variations ...
Now showing items 12517-12536 of 39126