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Browsing ELibrary by Title
Now showing items 13506-13525 of 21879
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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 ...
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(2004)A model describing the redistribution of masses of variable valence elements and their isotopes at a moving okidation front appearing in the course of oxygen-bearing water penetration into deep crustal levels was used to ...
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(2003)In the SW Urals a change of tectonic conditions occurred at around 620 Ma leading to a detrital input from contrasting provenance areas. Fifty-seven detrital zircons were separated from Proterozoic sandstones of this setting ...
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(2006)Alpine-type dunite-harzburgite-lherzolite massifs have long attracted much attention of geologists as reference objects for geological and petrological models and as massifs hosting economic deposits of Cr, Ni, and asbestos. ...
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(1987)The problem of the origin of bariopyrochlore and strontiopyrochlore in weathered carbonatite mantle must be solved by special methods, including systematic study of pyrochlore compositions in the supergene alteration zone ...
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(2000)The EPR method was for the first time used for studying composition, form, and structural transformations of paramagnetic impurities in major generations of halite from the zones of basic-rock-evaporite interaction. The ...
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(1989)The authors analyze a new Precambrian microbiota from the top of the Tyulmen beds that constitute the top of the Avzyan Formation of the Middle Ripean of the southern Urals. This microbiota is interesting for two reasons. ...
Now showing items 13506-13525 of 21879