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Browsing ELibrary by Title
Now showing items 9644-9663 of 21638
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(2002)We report results of delay-Doppler observations of 1999 JM8 with the Goldstone 8560 MHz (3.5 cm) and Arecibo 2380 MHz (13 cm) radars over 18 days in July-August 1999. The images place thousands of pixels on the asteroid ...
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(2004)We observed 25143 Itokawa, the target of Japan's Hayabusa (MUSES-C) sample-return mission, during its 2001 close approach at Arecibo on twelve dates during March 18–April 9 and at Goldstone on nine dates during March ...
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(1998)In the framework of dynamical modelling of the geoid, we have estimated basic features of the radial profile of temperature in the mantle. The applied parameterization of the geotherm directly characterizes thermal boundary ...
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(2001)The viscosity of silicic melts depends strongly on their water content. As bubbles grow in a supersaturated melt, water evaporates from the bubble-melt interface. A diffusive profile develops and leads to steep viscosity ...
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(2003)A single, zoned, Sri Lankan zircon exhibits a range of microstructures from crystalline to nearly amorphous that are the result of radiation damage over a dose range of 2.1-10.1·1015 α-decay events/mg (0.16-0.47 dpa). The ...
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(1998)Monazite and zircon respond differently to ion irradiation and to thermal and irradiation-enhanced annealing. Monazite cannot be amorphized by 800 keV Kr+ ions at temperatures greater than 175°C; whereas, zircon can be ...
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(2003)The widespread distribution of zircon in the continental crust, its tendency to concentrate trace elements, particularly lanthanides and actinides, its use in age-dating, and its resistance to chemical and physical degradation ...
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(2001)Dynamics of thermal stresses arising in minerals under action of accelerated electrons has been investigated. Results of the investigations have shown that the stresses determine technological indices of grinding and ...
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(1996)Orbital explanations of paleoclimatic records traditionally focus on daily insolation at ˜ 60°N. We exemplify how insolation at different latitudes and different times of day can explain the timing of the Devil's Hole ...
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(2003)Radiaxial fibrous calcite (RFC) has previously been interpreted as a marine or replacive cement. Study of the Dongjeom Formation (Early Ordovician), Korea, shows that RFC can form in marine-meteoric mixing zones as a ...
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(1999)A sill of murmanite-lorenzenite tinguaite is exposed on the northern slope of Mt. Selsurt, Lovozero alkaline complex (Kola Peninsula). The sill emplaced into the differentiated series represents a hypabyssal facies of ...
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(1989)Correlation of the stratigraphy and chemical composition of gray tephra of Paektusan, in bottom sediments of the Sea of Japan, and on Honshu shows that very powerful explosive phases of eruptions occurred between the end ...
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(2004)This paper reviews the history of the woolly mammoth (Mammuthus primigenius Blum.) in Siberia and adjacent northern Asia. The particular emphases are the chronology and environment of mammoth existence and extinction, based ...
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(1998)Radiocarbon (#14C) and stable carbon isotopes (δ13C) were measured in total hydrolyzable amino acid (THAA), total carbohydrate (TCHO), total lipid, and acid-insoluble organic fractions that had been separated from ...
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(1998)Radiocarbon (Δ14C) and stable carbon isotopes (δ13C) were measured in total hydrolyzable amino acid (THAA), total carbohydrate (TCHO), total lipid, and acid-insoluble organic fractions that had been separated from ...
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(2001)Evaluation of 14C in tree rings provides a measure of the flux of magmatic CO2 from Mammoth Mountain both before and after 1994 when copious diffuse emissions were first discovered and linked to tree kill. We analyzed the ...
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(1999)Reduced 4He/3He ratios, e.g., down to ≈1/100 times those expected from radiogenic production, were observed in sedimentary rocks. Formation and history of these rocks eliminate a contribution of mantle 3He-bearing fluid. ...
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(2002)The inorganic silicate fraction extracted from bulk pelagic sediments from the North Pacific Ocean is eolian dust. It monitors the composition of continental crust exposed to erosion in Asia. 176Lu/177Hf ratios of modern ...
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(2001)Mantle isochrons such as those observed for oceanic basalts in the 207Pb/204Pb vs. 206Pb/204Pb diagram do not date discrete differentiation events but are often suggested to reflect a mean age of differentiation within the ...
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(2001)Radiogenic isotopes studied in fluid inclusions are still a limited field, with great potential for expansion as analytical techniques improve. The main limitation for Sr, Ar and He isotope work is the very small number ...
Now showing items 9644-9663 of 21638