Results 211 to 220 of about 153,774 (240)
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Earth-Science Reviews, 1975
Abstract The major element compositions of the various rocks that belong to the basalt clan are examined, and the basalt clan is defined as consisting of those volcanic rocks that contain between 44.0% and 53.5% silica. After examining both the diverse tectonic environments in which the basaltic rocks are found, and also the various petrographic ...
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Abstract The major element compositions of the various rocks that belong to the basalt clan are examined, and the basalt clan is defined as consisting of those volcanic rocks that contain between 44.0% and 53.5% silica. After examining both the diverse tectonic environments in which the basaltic rocks are found, and also the various petrographic ...
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The genesis of basaltic magmas
Contributions to Mineralogy and Petrology, 1967This paper reports the results of a detailed experimental investigation of fractionation of natural basaltic compositions under conditions of high pressure and high temperature. A single stage, piston-cylinder apparatus has been used in the pressure range up to 27 kb and at temperatures up to 1500° C to study the melting behaviour of several basaltic ...
Green, D. H., Ringwood, A. E.
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The crystallization of basalts
American Journal of Science, 1929This classic paper presents Fenner9s views of magmatic differentiation against those of N.L. Bowen (1928). Fenner presents the original case for iron-enrichment trends in residual basaltic liquids, contrasted with an iron depletion trend leading to rhyolite.
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The case for old basaltic shergottites
Earth and Planetary Science Letters, 2008Abstract The crystallization age of shergottites is currently not agreed upon. Although mineral 87Rb–87Sr, 147Sm–143Nd, 176Lu–176Hf, and U–Pb isochrons all give very young ages, typically in the range of 160–180 Ma, 207Pb–206Pb data support a much older crystallization age at 4.1 Ga, which is consistent with published whole-rock 87Rb–87Sr data on ...
Bouvier, Audrey +4 more
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The Journal of Geology, 1932
The basalts of Patagonia, as determined from the literature and from the microscopical and chemical study of rocks from three widely separated localities, are found to belong to those slightly undersaturated types which appear to be characteristic of plateau-basalts in the restricted sense of Gregory and Reck.
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The basalts of Patagonia, as determined from the literature and from the microscopical and chemical study of rocks from three widely separated localities, are found to belong to those slightly undersaturated types which appear to be characteristic of plateau-basalts in the restricted sense of Gregory and Reck.
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2017
In this section, the basic and the latest developments of basalt fiber and its composites will be reviewed in detail. In this context, the chapter involves an introduction, preparation, and the structural (mechanical, thermal, etc.) properties as a beginning to the basalt fiber.
Ferit Cakir +3 more
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In this section, the basic and the latest developments of basalt fiber and its composites will be reviewed in detail. In this context, the chapter involves an introduction, preparation, and the structural (mechanical, thermal, etc.) properties as a beginning to the basalt fiber.
Ferit Cakir +3 more
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Improving the tensile strength of continuous basalt fiber by mixing basalts
Fibers and Polymers, 2017SiO2 is a key factor that affects the tensile strength of continuous basalt fiber, as shown in a previous study. In the present work, to improve the tensile strength of continuous basalt fiber, basalts with a high SiO2 content were mixed with basalts with a low SiO2 content to obtain basalt mixtures with SiO2 contents ranging from 51 to 58 %.
Haibin Huo +3 more
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Three basaltic earth-approaching asteroids and the source of the basaltic meteorites
Icarus, 1991Diameters of 1.2, 1.0, and 3.4 km are respectively derived for the earth-approaching asteroids 1983 RD, 1980 PA, and 1985 DO2, whose spectra are virtually identical to that of the basaltic-surfaced large asteroid, Vesta. While probably not fragments of Vesta, the three asteroids may be fragments of one or more Vesta-like parent bodies; it is suggested ...
Robert H. Brown +5 more
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Properties of thermally recycled basalt fibres and basalt fibre composites
Journal of Materials Science, 2017The reduction to the tensile failure stress caused by high-temperature incineration of basalt fibres is investigated. The failure stress of single basalt fibres and tows decreases rapidly with increasing temperature when heated above ~ 250 °C, and at temperatures typically used for incineration of waste composite materials (450–600 °C) the fibre ...
Adrian P. Mouritz +3 more
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Thermal and Sintering Behaviour of Basalt Glasses and Natural Basalt Powders
Journal of Thermal Analysis and Calorimetry, 1999A study of three Spanish and one Bulgarian basaltic rock demonstrated that, after thermal treatment at temperatures higher than 800°C, crystallization of pyroxenes, anorthite and magnetic occurred. Following sintering of the original basalts and powdered original glasses, the same crystalline phases were nucleated and grown in the resulting glass ...
H. Hristov +5 more
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