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Browsing ELibrary by Title
Now showing items 8210-8229 of 21936
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(1997)We present here the first survey of (231Pa235U) ratios in volcanic rocks; such measurements are made possible by new mass spectrometric techniques. The data place new constraints on the timing and extent of magma source ...
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(1994)Observations of molten mid-ocean ridge basalt (MORB)-molybdenum (Mo) interactions produced by shock experiments provide insight into impact and differentiation processes involving metal-silicate partitioning. Analysis of ...
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(2004)Theory and observations suggest that seismic shear wave splitting, caused by fluid-saturated stress-aligned microcracks, directly monitors low-level deformation before fracturing, faulting and earthquakes occur. In the ...
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(2003)Measurements of superimposed ice formation and snow properties as a function of the surface energy balance during melt-onset are presented. They were performed on fast ice on Kongsfjorden, Svalbard, between late May and ...
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(2000)The magnetic mineral grains that carry natural remanent magnetization (NRM) in rocks can undergo changes in volume, chemical composition, or both. Because domain structure is a function of particle size, composition, and ...
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(2001)Biotite is the most used 40Ar-39Ar geochronometer yet two significant problems arise from Ar-Ar step-heating. Dating altered biotite can be problematic, producing disturbed age spectra that reflect 39Ar recoil. However, ...
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(1996)The trapping mechanism of noble gases during growth of magnetite is investigated by oxidizing Fe with water vapor at temperatures ranging from 500 to 1300oC. An apparent negative correlation between the concentration of ...
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(2004)The highly aromatic structure of the macromolecular organic matter (OM) of the Murchison and Orgueil meteorites was recently shown to contain free organic radicals which are concentrated in micro-regions in contrast with ...
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(2000)Chemical stratification occurs in the water columns and sediments of many aquatic habitats resulting in vertical chemical and redox gradients. Various types of microorganisms are often associated with specific depths and ...
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(2002)Examines the occurrence and genesis of thunder eggs containing plume and moss agate. Description of the surface textures of staples; Components of thunder eggs; Documentation of the occurrence of nodules on rhyolite.
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(1987)Analysis of aromatic hydrocarbon fractions of selected coal and shale samples reveals the predominance of two specific polyalkylnaphthalenes which have been identified as 1,2,5-trimethylnaphthalene and 1,2,5,6-tetramethy ...
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(2005)Andalusite occurs as an accessory mineral in many types of peraluminous felsic igneous rocks, including rhyolites, aplites, granites, pegmatites, and anatectic migmatites. Some published stability curves for And = Sil and ...
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(2004)Natural “monalbite” (MA) has been observed on a submicron-scale in jadeite along with high albite (HA) and low albite (LA) in jadeite quartzite in the Dabie ultrahigh-pressure (UHP) metamorphic terrane, China. Transmission ...
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(2002)The purified cell walls of mother cells (CWM) were isolated from three strains of trilaminar sheath (TLS)- and algaenan-containing freshwater microalgae Chlorella emersonii, Tetraedron minimum and Scenedesmus communis. The ...
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(1998)We report on the occurrence of fullerenes in Proterozoic shungite (∼2 Ga) from the shungite mine, Kondopoga, Karelia, Russia (62.12°N 34.17°E). The presence of fullerenes has been confirmed by mass spectrometry, with peaks ...
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(2001)The polar fraction, isolated from the off-line pyrolysate at 400°C of a Late Tithonian, sulphur- and oxygen-rich, kerogen was examined via Raney Nickel desulphurization and TMAH thermochemolysis. Important information on ...
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(1999)Mylonitic rocks associated with the south-dipping detachment fault of the Yagan Onch Hayrhan metamorphic core complex in southernmost Mongolia indicate subhorizontal south-southeast directed extension in the Early Cretaceous; ...
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(1988)To make a synchronous survey of an eddy field over a large area (300 miles × 300 miles) the Institute undertook in late 1987 the interdepartmental Megapoligon expedition in the northwestern Pacific Ocean, east of Japan and ...
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(2001)Estimates of the effective elastic thickness (Te) of the oceanic lithosphere based on gravity and bathymetric data from island loads are commonly significantly lower than those based on the wavelength of plate bending at ...
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(2003)The excitation mechanism of the Chandler wobble (CW) is investigated by examining the power spectra of oceanic angular momentum (OAM) excitation (1985-1995) and two series of atmospheric angular momentum (AAM) excitation. ...
Now showing items 8210-8229 of 21936