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Browsing ELibrary by Title
Now showing items 12586-12605 of 21934
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(2002)We use geometric morphometrics to test a claim that the Ordovician trilobite Carolinites exhibits gradualistic evolution. We follow a previously proposed definition of gradualism, and define the criteria an ideal ...
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(2002)The study of the temporal area of skulls in various theromorph groups demonstrated that the Ophiacodontia retain a primitive epipteric cavity between the braincase wall and the adductor fossa, which is limited laterally ...
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(2001)The origin of tetrapods from sarcopterygian fish in the Late Devonian is one of the best known major transitions in the history of vertebrates. Unfortunately, extensive gaps in the fossil record of the Lower Carboniferous ...
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(2003)The composition of the subcontinental lithospheric mantle (SCLM) varies in a systematic way with the age of the last major tectonothermal event in the overlying crust. This secular evolution in SCLM composition implies ...
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(2004)Experimental simulation of incremental crystal fractionation of a hy-normative hawaiite indicates that the spectrum of compositions from mildly alkalic hawaiite to sodic rhyolite found in silica-saturated alkalic suites ...
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(2001)This study reports δ13C, δ15N and N-content values for microdiamonds from ultrahigh-pressure metamorphic rocks of the Kokchetav massif in Kazakhstan. Both alluvial diamonds and in-situ diamonds from a garnet–clinopyroxene ...
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(1997)We present new INAA results for bulk metal from H and LL chondrites. Both have characteristic elemental patterns similar to L chondrite metal, in particular increasing abundances of W and Ga from unequilibrated to equilibrated ...
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(1998)This study elucidated the source of mantle helium rising to underground fluids in the zone of the recent magmatic activity in the northern Caucasus and the adjacent part of the Scythian Plate. It is shown by way of numerical ...
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(1997)Abyssal peridotites have been interpreted to be residues of mantle melting beneath ocean ridges. Recent experimental data and models of mantle melting allow quantitative tests of this hypothesis. The tests show that abyssal ...
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(1999)We calculated primary bulk compositions for a global suite of abyssal peridotites using primary mineral modes and either analyzed or calculated phase compositions. The latter were obtained through correlations between ...
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(1995)Hornblende and arfvedsonite were formed at T = 525-550°C anmd P = 1-1.5 kbar in the middle part of the contact aureole of the Kharlovo gabbro massif. A rare combination of heterogeneous rock composition, PT-parameters and ...
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(2003)An attempt is made to develop an in situ crystallization model based on the concept of Soret fractionation to explain the origin of commonly observed S-, D-, and I-shaped compositional profiles in sills formed from a single ...
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(2004)Description of a new genus of perissodactyl, Protomoropus, for the species ‘Hyracotherium’gabuniai Dashzeveg and its inclusion with a diversity of other primitive perissodactyls in a cladistic analysis results in the ...
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(1993)We characterize ten chromitic chondrules, two spinelian chondrules and one spinel-bearing chondrule and summarize data for 120 chromitic inclusions discovered in an extensive survey of ordinary chondrites. Compositional ...
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(2004)Monitoring of the confined Cambrian-Vendian aquifer system utilised for industrial water supply at Kopli Peninsula in Tallinn over 24 years reveals remarkable changes in chemical composition of groundwater. A relatively ...
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(1990)We performed a complete noble gas study on eight different josephinites and one oregonite. The 4He/3He ratios range between 100,000 and 330,000 and are probably due to a combination of a MORB He-component from the Josephinite ...
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(2003)In suspensions of monodispersed spherical silica particles (MSSP) proceeds their sedimentation with formation of semi-liquid supramolecular crystals (SC). Solid MSSP in them are separated by liquid layers of a thickness ...
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(2000)The light hydrocarbons (LHs) are probably intermediates in the catalytic decomposition of oil to gas: Oil->LHs->Gas Two lines of evidence support this possibility. First, the reaction was duplicated experimentally under ...
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(2005)The aim of this paper is to discuss the results of studying the magnetic properties of sediments in the Khubsugul Lake (Mongolia). The samples of the sediments were collected at interval of ~0.04 m from the cores of the ...
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(2003)Marginal reversals a common feature of many basic differentiated igneous bodies regardless of their size and bulk composition are remarkable in being a mirror of the Layered Series. These are distinguished by: (1) an ...
Now showing items 12586-12605 of 21934