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Browsing ELibrary by Title
Now showing items 8470-8489 of 21936
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ONSET OF SUBDUCTION AS THE CAUSE OF RAPID PLIOCENE-QUATERNARY SUBSIDENCE IN THE SOUTH CASPIAN BASIN (2002)Backstripping a representative stratigraphic column from the northwest of the South Caspian basin shows that 2.4 km of tectonic subsidence has occurred since ca. 5.5 Ma, at 1.5–10 times the rate recorded in typical foreland ...
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(2001)Ontogenetic trends (umbo to growth edge of shell) in aspartic acid (Asp) racemization and amino acid composition and their evolution over time are examined in serial samples of annual growth bands from a time-series of ...
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(2006)Previous attempts to evaluate ocean P mass balance and residence time have utilized sequential extraction techniques to isolate and analyze P associated with Fe and Mn oxides and oxyhydroxides, authigenic minerals, detrital, ...
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(2001)The chemistry and mineralogy of a group of opaque mineral assemblages in the matrix of the Bishunpur LL3.1 ordinary chondrite provide insight into the nebular environment in which they formed. The assemblages consist of a ...
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(2002)Vent processes were examined at Karymsky volcano, Kamchatka, by measuring SO2 emissions using a correlation spectrometer (COSPEC). Continuous high-sensitivity COSPEC measurements and physical observations were collected ...
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(2000)It is commonly assumed that an olivine-hosted melt inclusion is chemically isolated from the melt surrounding its host crystal. This assumption is probably valid for slow-diffusing, incompatible trace elements, but for ...
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(2004)Significant petrogenetic processes governing the geochemical evolution of magma bodies include magma <unl>R</unl>echarge (including formation of ‘quenched inclusions’ or enclaves), heating and concomitant partial melting ...
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(2004)Significant petrogenetic processes governing the geochemical evolution of magma bodies include magma <unl>R</unl>echarge (including formation of ‘quenched inclusions’ or enclaves), heating and concomitant partial melting ...
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OPERATIONAL TECHNOLOGY FOR SNOW-COVER MAPPING IN THE CENTRAL ASIAN MOUNTAINS USING NOAA-AVHRR DATA (2001)An important problem in the evaluation of snow in mountains, is that of the observation and mapping of snow cover variations which is required for snowmelt runoff forecasting in mountain river basins. Satellite data are ...
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(2003)A major new synthesis of ophiolite geochronology and map of global Phanerozoic distribution indicates that previously noted pulses of ophiolite obduction can be linked to superplume-related tectonism. A marked cyclicity ...
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(2004)Ophiolites show a wide range of internal structure, pseudostratigraphy and chemical fingerprints suggesting various tectonic settings of their origin. In general, they are characterized as mafic-ultramafic assemblages and ...
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(2004)Isotopic profiles through ophiolite complexes provide the necessary link between the study of global geochemical cycles and plate tectonics. The hydrothermal circulation that occurs beneath the sea floor is the primary ...
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(2004)The existing published data, combined with our own new field, petrographic, and geochemical observations and data show that ophiolites of the West Koryak fold system originated in a variety of tectonic environments. This ...
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(2003)Ophiolites are widespread in the southern Urals as large allochthonous sheets and discrete blocks in tectonic melange and mixtites. They are spatially associated with volcanic sequences varying in age from Ordovician to ...
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(2003)Lithologic assemblages termed "ophiolites" were at the heart of the mid-twentieth century "plate tectonics" paradigm shift when they were widely accepted as representing sections of the oceanic crust created during the ...
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(2002)We have identified four comets which have produced low-velocity Earth-crossing dust streams within the past century: 7P/Pons-Winnecke, 26P/Grigg-Skjellerup, 73P/Schwassmann-Wachmann 3, and 103P/Hartley 2. These comets have ...
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(1989)It has long been thought that optical activity is exhibited only by organic compounds of biological origin, among which levorotatory forms are strongly predominant. Systematization of numerous data on the sign of the optical ...
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(2002)The spectroscopic study of iron in micas is generally focused on one or both of two goals: determination of the relative amounts of Fe2+ and Fe3+ present, and assessment of the distribution of those ions among the one ...
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(2005)High pressure optical and near infrared spectra of a single crystal of ringwoodite with composition (Mg0.90Fe0.10) 2SiO4 were measured to 21.5 GPa. The spectrum at ambient pressure shows a strong band at 12 265 cm-1 with ...
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(2001)Present optical techniques, which are considered to be relevant to monitor volcanoes, are reviewed. A short description of each technique is given, as well as the peculiar conditions of applicability. Recent experimental ...
Now showing items 8470-8489 of 21936