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Browsing ELibrary by Title
Now showing items 3391-3410 of 21934
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(2004)Metasomatic amphibole-eclogite sequences grew in selvages of quartz veins from the Marun-Keu complex (Polar Urals, Russia) during high-pressure metamorphism. Relicts of a pre-metasomatic eclogite-facies assemblage are ...
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(2001)Haüy coined the term eclogite, meaning “chosen rock”, in 1822, but de Saussure had already observed rocks of this type in the Alps four decades earlier. Throughout the 19th century, the origin of eclogite remained an enigma, ...
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(2001)Petrochemical and geochemical data make it possible to characterize the nature of the protolith of a boudin from the lower unit of the Maksyutov Complex. The eclogite was determined to have developed after igneous rocks ...
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(1996)The first ion-probe trace element analyses of clinopyroxene-garnet pairs both included within diamonds and from the eclogite host xenoliths are reported; these diamondiferous eclogites are from the Udachnaya and Mir ...
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(2000)Analytical transmission electron microscopy (ATEM) was used to characterize mineral parageneses occurring in melt veins of shock origin in the Martian meteorite Zagami. We discovered a new ultra-high pressure 'eclogite ...
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(2003)Trace fossils represent the preserved interactions of trace making organisms with their environment. The form of traces should result from complex interactions among the organism's morphology, the behavior being carried ...
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(2002)The Middle to Upper Paleolithic transition in Western Europe is characterized, from an ecological point of view, by large-ungulate communities adapted to cold climatic conditions. The aim of this study is to reconstruct ...
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(2001)A sequence of peat enriched with impact ejecta (allochthonous minerals and iridium) from Piila bog, 6 km away from the Kaali impact crater (island of Saaremaa, Estonia), was examined using pollen, radiocarbon, loss-on-ignition, ...
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(2004)Sedimentary sections from Lake Baikal in Siberia and Lake Hovsgol in Mongolia show that during the Last Glacial Maximum (LGM), planktonic/benthic diatoms, chrysophyte cysts, sponge spicules and zooplankton remains did not ...
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(2001)The Quaternary, the last and shortest period of geological history that is still in progress, is unique in many respects. Quaternary mineral resources are considered here as a constituent of the Quaternary environments. ...
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(1999)Anthropogenic hydrogeochemical anomalies are specified in the Kola region. Their development is related to direct discharges and runoffs of mining and metallurgical activity and the indirect effects of element leaching by ...
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(2000)The new mineral species edgarite, FeNb3S6, was discovered in a feldspar-rich fenite, in a fenitized xenolith enclosed by nepheline syenite of the Khibina alkaline complex, Kola Peninsula, northwestern Russia. It occurs as ...
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(1998)We consider a series of simple calculations with a step-function change in thickness of the lithosphere and imposed, far-field boundary conditions to illustrate the influence of the lithosphere on mantle flow. We consider ...
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(2003)Functional, constructional, and preservational criteria led to a reinterpretation of seemingly complex trace fossils and the majority of assumed metazoan body fossils from Vendian lagerstatten. In the new scenario, Ediacaran ...
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EDIACARIAN SPONGE SPICULE CLUSTERS FROM SOUTHWESTERN MONGOLIA AND THE ORIGINS OF THE CAMBRIAN FAUNA (1997)Carbon and strontium isotopic data are used to show that the earliest sponge spicule clusters and associated phosphatic sediments (with Anabarites) from southwestern Mongolia are of Ediacarian age. Spicule morphologies ...
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(2004)High-resolution pollen records from the northern alpine foreland are used to evaluate the patterns of climate change during the period between the late Eemian Interglacial (marine oxygen isotope stage OIS 5e) about 115 ky ...
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(1988)We analyze the convective stability of a system consisting of two infinite horizontal layers separated by a contact boundary which in the case of hydrostatic equilibrium is planar and is located at a fixed depth. The layers ...
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EFFECT OF ACID AND ALKALI TREATMENTS ON SURFACE AREAS AND ADSORPTION ENERGIES OF SELECTED MINERALS (2002)Bentonite, biotite, illite, kaolin, vermiculite and zeolite were acidified or alkalized with hydrochloric acid or sodium hydroxide at concentrations of 0.1, 1.0 and 5.0 mole dm 3 at room temperature for two weeks. In acid ...
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(2002)Bentonite, biotite, illite, kaolin, vermiculite and zeolite were treated with 0.1, 1.0 and 5.0 mol. dm-3 HCl or NaOH. Suspensions of Na homoionic forms of the initial and the treated minerals were back titrated with 0.1 ...
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(1987)The paper reports on a study to determine the temperature and the composition at the invariant point in the system Ab-Ort as a function of HCl concentration in the aqueous fluid at Ptot = Pfl = = 1 kb. The procedure resembled ...
Now showing items 3391-3410 of 21934