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Browsing ELibrary by Title
Now showing items 5620-5639 of 21821
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(1989)Correlation of more than 1700 specific layered sections of the volcanic sequence in terms of their rhythmic stratigraphy has led to identification of lithological and stratigraphic intervals corresponding to formations, ...
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(1988)A series of novel methylated phytanylbenzenes (phytanylbenzene, 1-methyl-3-phytanylbenzene, 1,4-dimethyl-2-phytanylbenzene, 1,2-dimethyl-4-phytanylbenzene and 1,2,4-trimethyl-5-phytanylbenzene) have been identified in ...
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(2003)New author's and literature data are employed in discussing the role of a diversity of factors controlling variations in the composition and isotopic-geochemical characteristics of plume-related volcanics. There are three ...
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(2001)Based on REE analyses of 105 world-wide distributed Cambrian fossil apatite samples and eight late Neoproterozoic phosphate concretions, a close relationship is established between the concentrations of MREE and Ce anomalies. ...
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(2001)Thermochemolysis with tetramethylammonium hydroxide (TMAH) was utilized to analyze peptide-like material in insoluble residues of geochemical samples. Product identification was performed by gas chromatography/mass ...
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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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(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 ...
Now showing items 5620-5639 of 21821