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Browsing ELibrary by Title
Now showing items 13500-13519 of 21879
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(1989)Comparison of rocks studied shows that the largest differences between ongonites and elvans from different granite associations are those in the oxides of iron, calcium and phosphorus. The ongonite associated with plumasitic ...
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(2000)Two Type B refractory inclusions, consisting mainly of melilite, fassaite and spinel +/- anorthite, were found in the anomalous Ningqiang carbonaceous chondrite. The composition of melilite varies from #9k4-15 near the ...
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(2005)The occurrences of natural coexisting feldspars including hyalophane and also celsian delineate two-, three- and possibly four-phase fields in the system BaAl2Si2O8-CaAl2Si2O8-NaAlSi3O8-KAlSi3O8. Hyalophane occurs with ...
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(2003)We present 2-D simulations of convection in the Earth's mantle with temperature and damage-dependent viscosity in a basally heated system. The equation governing the temporal evolution of damage includes a source term for ...
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(2002)Interpretation of magnetotelluric (MT) data for three-dimensional (3-D) regional conductivity structures remains uncommon, and two-dimensional (2-D) models are often considered an adequate approach. In this paper we examine ...
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(2001)Recently developed mathematical models of subsidence in extensional basins provide a good basis for forward modeling. However, the large number of parameters to be specified by the user makes it difficult not only to do ...
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(2000)Pressure (P)–temperature (T) paths accurately record movement of metamorphic rocks within the Earth’s crust. 1D geodynamic modeling of P–T-time paths of regional metamorphism have explained many important features of the ...
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(2006)The seafloor is the site of intense biogeochemical and mineral dissolution-precipitation reactions which generate strong gradients in pH near the sediment-overlying water interface. These gradients are usually measured in ...
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(2002)Detachment of the deeper part of subducted lithosphere causes changes in a subduction zone system which may be observed on the Earth's surface. Constraints on the expected magnitudes of these surface effects can aid in the ...
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(1996)A two-dimensional velocity structure for the mantle down to a depth of 700 km derived from super long-range nuclear explosion seismic data recorded along the Quartz profile in northern Eurasia is presented. The profile ...
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(2001)The two-mica granites in the neosomes of a large agmatite structure were determined to be heterogeneous. They differ in major- and trace-element composition, age, and origin. The rocks are geochemically classified into ...
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(2003)Using a classical averaging approach, we derive a two-phase theory to describe the deformation of a porous material made of a matrix containing voids. The presence and evolution of surface energy at the interface between ...
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(1999)General relations for heat and mass transfer in heterogenous media were used to derive and examine a set of equations for describing two-phase vapor-liquid flow. Possible applications of this approach are illustrated by ...
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(1999)We explore a geochemical model for mantle evolution where a sequence of hotspot and ridge upwelling has melted the mantle to make hotspot and mid-ocean ridge basalts and their residues, and plate subduction has re-cycled ...
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(1995)Marine geologic evidence from the western Barents Sea shelf leaves little doubt that the area was covered by grounded ice during the last glaciation, but the pattern and timing of the subsequent deglaciation were not well ...
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(2001)The purpose of the study was to use geochemical characteristics and apparent ages of sampled groundwaters to determine which of the two regionally extensive bedrock aquifers, the lower bedrock aquifer or the upper bedrock ...
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(2004)For the previously suggested for the platforms evolution series (ancient, mature, young, juvenile) the corresponding characteristic types of platform covers are specified. The principle scheme is given for bedding of various ...
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(1989)For the Yenisey Ridge, a region with a very complete Precambrian section in the southwestern part of the Siberian craton, we have analyzed the REE-distribution in granitoid rocks of genetically different types. These crustal ...
Now showing items 13500-13519 of 21879