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Olivines and olivine coronas in mesosiderites
Geochimica et Cosmochimica Acta, 1980The paper presents a study of olivines and their surrounding coronas in mesosiderites texturally and compositionally using optical and microprobe methods. Olivine composition ranges from Fo(58-92) and shows no consistent pattern of distribution within and between mesosiderites; olivine occurs as large single crystals or as partially recrystallized ...
C.E. Nehru +3 more
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Sintering of olivine and olivine-basalt aggregates
Physics and Chemistry of Minerals, 1984The sintering behavior of olivine and olivine-basalt aggregates has been examined at temperatures near 1,300° C. Experimental factors contributing to rapid sintering kinetics and high-density, fine-grained specimens include: (i) the uniform dispersion of basalt throughout the specimen, (ii) a very fine, uniform particle size for the olivine powder ...
R. F. Cooper, D. L. Kohlstedt
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Olivine phenocrysts of Hawaiian olivine tholeiite and oceanite
Contributions to Mineralogy and Petrology, 1982Olivine phenocrysts of Hawaiian tholeiites display a variety of textures and a variation in composition which is due to supercooled crystallization. The highest forsterite content measured is 91%, and the highest magnesia content estimated for a tholeiitic liquid is 17%, using the olivine geothermometer.
Sven Maal�e, Birger Hansen
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Olivine nodules in olivine nephelinite from Tokatoka, Northland
New Zealand Journal of Geology and Geophysics, 1965Abstract Petrographic descriptions and a chemical analysis are presented of an olivine nephelinite occurring as a dike in argillaceous limestones and in regional association with a Miocene basalt‐andesite‐dacite igneous suite. The mineralogy and possible origin of olivine nodules carried by the nephelinite are discussed.
Philippa M. Black, R.N. Brothers
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Formation conditions of pyroxene-olivine and magnesian olivine chondrules
Geochimica et Cosmochimica Acta, 1990Dynamic crystallization experiments performed on a Type I and an intermediate Type II/III composition demonstrate chondrule texture is controlled by the abundance of heterogeneous nuclei. This factor is controlled by the maximum initial temperature relative to the olivine disappearance temperature for the given heating time.
Patrick M. Radomsky, Roger H. Hewins
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Science, 1966
Welding of olivine was demonstrated by grinding it in a ball mill in an atmosphere of about 2 × 10 -7 torr. Most of the sample adhered strongly to the container and grinding balls although adhesion in air is only slight.
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Welding of olivine was demonstrated by grinding it in a ball mill in an atmosphere of about 2 × 10 -7 torr. Most of the sample adhered strongly to the container and grinding balls although adhesion in air is only slight.
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Banded Olivines in some Scottish Carboniferous Olivine-Basalts
Geological Magazine, 1957AbstractLarge, individual olivine crystals exhibiting a banded structure are described from olivine-basalts from a number of localities in the Carboniferous lavas of the Midland Valley. This structure is of deformational nature and provides what seems to be a sound criterion for distinguishing between phenocrystic and xenocrystic olivine in olivine ...
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2012
The greenhouse effect, thanks mainly to the water vapor in our atmosphere, has created a livable climate on Earth. Climate change, however, may potentially have dire consequences. It is generally assumed that the rise in CO2 levels in the atmosphere is the main culprit, although several other greenhouse gases (GHG) also play a role.
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The greenhouse effect, thanks mainly to the water vapor in our atmosphere, has created a livable climate on Earth. Climate change, however, may potentially have dire consequences. It is generally assumed that the rise in CO2 levels in the atmosphere is the main culprit, although several other greenhouse gases (GHG) also play a role.
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Olivine of 446 Aeternitas As an Example of Olivines of A-class Asteroids
Solar System Research, 2001A reflectance spectrum of A-asteroid 446 Aeternitas was numerically simulated. Probable mineral composition of the asteroid surface (Px > Ol ∼ Met) and probable spectra of these minerals were obtained. Since the grain size of asteroid regolith is unknown, a method for estimating the range of the chemical composition of olivine is proposed. According to
L. F. Golubeva, D. I. Shestopalov
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Olivine in Antarctic micrometeorites: Comparison with other extraterrestrial olivine
Geochimica et Cosmochimica Acta, 1992The compositions of 5-micron or larger Mg-rich olivines from 26 Antarctic micrometeorite particles were examined and compared with those of other extraterrestrial olivine. The following differences were noted between the Antarctic meteorites and the generally recognized meteorite groups: (1) while refractory-rich (e.g., high Al2O3 or CaO) are common in
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