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Browsing ELibrary by Title
Now showing items 2387-2406 of 21638
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(1993)A suite of iron meteorites has been analysed for their content and isotopic composition of nitrogen to investigate the behaviour of nitrogen in the iron meteorite parent bodies and any constraints this can place on the ...
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(1996)If the viscosity of subducted lithosphere is described purely by temperature and pressure, it should remain considerably more viscous than the surrounding material as it descends through the upper mantle. Many dynamic ...
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(1992)Current hypotheses for the source rock of low Ca garnets hosted in mantle-derived diamonds and xenoliths range from residues of komatiite generation, to subducted serpentinite, to subducted mid-ocean ridge (MORB) harzburgite. ...
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(2002)The determination of the inner-core boundary structure is key to understanding the mechanisms of inner-core growth, iron solidification and anisotropy formation in the inner core. A waveform inversion of a worldwide data ...
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(2002)Event trees are useful frameworks for discussing probabilities of possible outcomes of volcanic unrest. Each branch of the tree leads from a necessary prior event to a more specific outcome, e.g., from an eruption to a ...
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(1998)A new concept 'gyrotropy of rocks' introduced earlier in the context, of a phenomenological theory is substantiated by constructing a model on a microlevel. This paper presents a model of a dissymmetric grainy medium with ...
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(2002)Natural aquifers are heterogeneous, and geostatistical methods are widely used to simulate the heterogeneity of aquifer properties. Due to limited available data, it is essential to integrate as much information as possible ...
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(1997)The estimated path of seawater 87Sr/86Sr during the Silurian and Devonian is based on 86 analyses (84 whole rocks) presented here and in other published results. The seawater 87Sr/86Sr rose steadily throughout the Silurian ...
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(2001)Prograde evolution of minerals in Fe- and Al-rich graphitic metapelites in the Ayakhtinsk aureole, Siberia, produced the unusual contact metamorphic mineral assemblages: chloritoid+biotite, chloritoid+biotite+andalusite ...
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(2003)Fluid inclusions were studied in quartz of concordant and discordant quartz veins from the gold-bearing deposits of the Allakh-Yun' group, Yakutia. The study area consists of four quartz-veined zones located at different ...
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(2002)The andalusite-sillimanite-type low-pressure Daulet Suite underlies the Kokchetav ultrahigh-pressure—high-pressure (UHP-HP) massif of northern Kazakhstan. The Daulet Suite is composed of pelitic-psammitic gneisses or schists ...
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(2003)We present results of study of contact-reactionary rocks from the Nyurundukan ultramafic-mafic massif in northern Prebaikalia. The host metabasites metamorphosed in the conditions of amphibolite facies are shown to have ...
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(2003)The free organic components of the Orgueil carbonaceous chondrite have been the subject of much controversy. Several proposals for their source have been put forward including extraterrestrial abiotic processes, extraterrestrial ...
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(2001)Mg-skarns enclosed in dunite cumulates of the Neo-Proterozoic Ioko-Dovyren intrusion (northern Baikal region, Russia) can be traced to silica-poor dolomitic host rock layers. The dominant minerals of the skarns are brucite ...
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(2004)Contemporaneous occurrences of the geologic signals of ‘large impacts’, craton-associated continental flood basalts, and mass extinctions have occurred far too often during the past 400 Myr to be plausibly attributed to ...
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(2004)Global coverage of landmass by a network of reference GPS stations has principally changed the interpretation of the observation of active processes on the Earth using modern space geodesy. The problem of realization of ...
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(1992)Sulphur contents and isotopic compositions have been determined in 90 fresh mantle-derived garnet and spinel peridotite and pyroxenite xenoliths from six regions of Cenozoic alkali basaltic volcanism in southern Siberia ...
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(1996)During the Neoproterozoic and Palaeozoic the two continents of Baltica and Laurentia witnessed the break-up of one supercontinent, Rodinia, and the formation of another, but less long-lived, Pangea. Baltica and Laurentia ...
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(2001)Orogeny is modelled numerically by treating continental collision within full convection solutions, in order to better understand some aspects of the Variscan structures and processes. Three different approaches are taken: ...
Now showing items 2387-2406 of 21638