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Now showing items 16345-16364 of 39124
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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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(2002)Tyatya Volcano, situated in Kunashir Island at the southwestern end of Kuril Islands, is a large composite stratovolcano and one of the most active volcanoes in the Kuril arc. The volcanic edifice can be divided into the ...
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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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Types of reservoirs of the Ufa stage of the Republic of Tatarstan. Genesis and reservoir properties (Общество с ограниченной ответственностью «Георесурсы», 2018)In this paper, we studied core material from well No. 15 of the extra-viscous oil field, geographically located within the western border of the South Tatar arch. Under laboratory conditions, reservoir properties (porosity, ...
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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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(EDP Sciences, 2016)The paper material is devoted to the research of crystallomorphology, accessory ilmenite expansion, characteristic features of its chemical composition, paragenetic association and conditions for mineral formation in ...
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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 16345-16364 of 39124