Results 181 to 190 of about 133,064 (217)
Performance Study of Asphalt Mixtures Reinforced with Gradated Basalt Fibers of Mixed Lengths. [PDF]
Materials (Basel)Ji X, Yuan Y, Huang Y, Shao J, Li S.
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Palaeomagnetism and basalts [PDF]
Bulletin Volcanologique, 1971 Among the various types of rocks, basalts are by far most suitable for palaeomagnetic studies. However, the magnetic parameters of basaltic rocks vary over a wide range and so also the magnetic stability. These features have been studied extensively for samples from Deccan and Rajmahal traps.
P. W. Sahasrabude, C. R. K. Murty
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2020
Basalts form the most important group of volcanic rocks and occur worldwide. Formation, differentiation and eruption of basaltic magmas are closely related to plate tectonics (e.g., Pearce and Cann 1973: see Table 19.1). Experimental investigations in simplified model systems and on natural rocks have contributed to our understanding of the genesis of ...
Martin Okrusch, Hartwig E. Frimmel
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Basalts form the most important group of volcanic rocks and occur worldwide. Formation, differentiation and eruption of basaltic magmas are closely related to plate tectonics (e.g., Pearce and Cann 1973: see Table 19.1). Experimental investigations in simplified model systems and on natural rocks have contributed to our understanding of the genesis of ...
Martin Okrusch, Hartwig E. Frimmel
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Science, 1982
Between 17 million and 6 million years ago, 200,000 square kilometers of the American Northwest were flooded by basaltic lava that erupted through fissures in the crust up to 150 kilometers long. Larger individual eruptions covered over a third of the Columbia Plateau in a few days. The lavas represent partial melts of the earth's mantle that were only
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Between 17 million and 6 million years ago, 200,000 square kilometers of the American Northwest were flooded by basaltic lava that erupted through fissures in the crust up to 150 kilometers long. Larger individual eruptions covered over a third of the Columbia Plateau in a few days. The lavas represent partial melts of the earth's mantle that were only
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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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Rare Earth Elements in Abyssal Basalts and Plateau Basalts
Nature Physical Science, 1971IT is current practice to compare the abundances of the rare Earth elements (REE) in various rocks as well as in lunar materials with those in chondrites when exploring their origins. It should be emphasized that Masuda–Coryell plotting (Masuda1, 1962; Coryell et al.2, 1963) played an important part in studies of REE abundances in terrestrial and ...
Noboru Nakamura, Akimasa Masuda
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2018
Chapter 7 aims to provide a comprehensive description of the basalt assemblages, a major component of the archaeological horizons of Gesher Benot Ya‘aqov. Analyses consist of taphonomic, morphological, technological, and typological observations, which enable characterization and reconstruction of the operational sequences of basalt.
Naama Goren-Inbar +3 more
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Chapter 7 aims to provide a comprehensive description of the basalt assemblages, a major component of the archaeological horizons of Gesher Benot Ya‘aqov. Analyses consist of taphonomic, morphological, technological, and typological observations, which enable characterization and reconstruction of the operational sequences of basalt.
Naama Goren-Inbar +3 more
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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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Degassing of alkalic basalts [PDF]
American Mineralogist, 1997 In order to model quantitatively exsolution of volatiles over the range of basaltic melt compositions found on oceanic islands, I present compositional parameterizations of H 2 O and CO 2 solubilities and use these parameterizations to develop vapor saturation and degassing models for alkalic basaltic liquids. Vapor-saturation diagrams generated as
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