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Browsing ELibrary by Title
Now showing items 5661-5680 of 21934
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(2004)The major contributions to the pyrite valence band have been identified experimentally by monitoring XPS valence band signal intensity as a function of photon (X-ray source) energy. The S-S σ and σ* orbitals are located ...
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(1995)We have analyzed sulfur K-edge X-ray absorption near-edge structures (XANES) and demonstrated, with a high degree of certainty, that sulfur is present in a variety of biogenic and diagenetic carbonates as sulfate. The ...
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(2001)A simple means of identifying poorly bleached samples is proposed for the dating of quartz using the single-aliquot additive-dose optically stimulated luminescence (OSL) protocol. For a well-bleached sample, it is shown ...
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(2002)The sources of and pathways for groundwater recharge in urban areas are more numerous and complex than in rural environments. Buildings, roads, and other surface infrastructure combine with man-made drainage networks to ...
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IDENTIFYING SPATIAL CHARACTERISTICS OF TRANSMISSIVITY USING SIMULATED ANNEALING AND KRIGING METHODS (2001)Groundwater flow and transport modeling require proper and accurate hydrogeological properties. These hydrogeological data, including information on transmissivity or hydraulic conductivity, may contain significant ...
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(2004)Since the frontal sides of the colonies of idmoneiform Tubuliporina follow a single plan, the developmental features of various heterozooecia acquire great taxonomic significance independently of the shape and position of ...
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(1989)Recent data indicate that even in the Urals, which constitute a reference femic type geosynclinal foldbelt, the geosynclinal structural and associational zones framing the ancient sialic blocks or microcontinents exhibit ...
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(1997)Igneous graphite, a rare constituent in terrestrial mafic and ultramafic rocks, occurs in three EH and one EL enstatite chondrite impact-melt breccias as 2-150 mu m long euhedral laths, some with pyramidal terminations. ...
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(1995)Many ordinary chondrite (OC) chondrules are surrounded by rims that show evidence of appreciable melting and can be called igneous; these rims formed after the melting and solidification of the host chondrule. We studied ...
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(2006)Melting of micrometeorites (MMs) due to atmospheric entry heating causes significant changes in the textures, mineralogies and compositions of particles that obscure their primary properties and greatly complicate ...
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(2002)Trace element abundances in igneous zircons, as determined by electron microprobe and laser-ablation microprobe ICPMS analysis, are shown to be sensitive to source rock type and crystallisation environment. The concentrations ...
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(2001)This study was carried out in the central segment of the East Kamchatka volcanic belt, known for its wide development of ignimbrites which cover an area of -4000 km2. Ignimbrites fill several calderas located in the central ...
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(2001)The Kübler Index (KI) is defined as the full width at half-maximum height (FWHM) of the 10-Å X-ray diffraction peak of illite-smectite interstratified (I-S) clay minerals. The only parameters controlling the Kübler Index ...
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(2005)Smectite illitization was investigated in felsic volcaniclastic rocks from a drill core near the Kakkonda active geothermal system, Japan, using high resolution transmission electron microscopy (HRTEM) that provided ...
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(2000)Illite-smectite (I-S) from Cambrian black shale of both early diagenetic and anchimetamorphic grade was investigated to determine the mechanism of the clay transformation. The layer sequences, the distribution of thicknesses ...
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(1999)Potassium enrichment is common in surface horizons of many paleosols and has been attributed to the formation of authigenic illite from smectites during burial diagenesis. In such cases, the presence of primary smectite ...
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(1987)Titanomagnetite-ilmenite mineralization, i.e., the composition and the mode of occurrence of minerals and their relationships to each other and to gangue minerals, was studied by ore microscopy and by petrographic, X-ra ...
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(2001)Image analysis is a technique used in a number of subjects, but to date not extensively used in the geological sciences. The paper describes the way image analysis is used in the various disciplines and presents an overview ...
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(2002)Scanning probe microscopy (SPM) has become a common tool in mineralogy but distortion of images complicates interpretation and often limit, the amount of information one can extract. Image distortion arises from a discrepancy ...
Now showing items 5661-5680 of 21934