Results 291 to 300 of about 70,688 (326)
Decoupling of high-pressure H2 production from serpentinization and magnetite in subduction zones
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Meteoritics & Planetary Science, 2021
AbstractOlivine‐phyric shergottites represent primitive Martian magmas, but they commonly contain excess olivine and rarely represent primary mantle melts. Olivine chemistry, however, tracks magma evolution and preserves information on the original parent magma composition.
Sierra Ramsey +7 more
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AbstractOlivine‐phyric shergottites represent primitive Martian magmas, but they commonly contain excess olivine and rarely represent primary mantle melts. Olivine chemistry, however, tracks magma evolution and preserves information on the original parent magma composition.
Sierra Ramsey +7 more
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Sintering of olivine and olivine-basalt aggregates [PDF]
Physics and Chemistry of Minerals, 1984 The 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 ...
Reid F. Cooper, David L. Kohlstedt
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Nature, 1968 THE alteration of olivines by oxidation is well known in natural processes, and Haggerty and Baker1 have recently shown that it is primarily responsible for high temperature alteration in lavas. They carried out heating experiments in air on hand picked unaltered grains of composition 20 per cent fayalite (Fe2SiO4) at temperatures from 600°–1,000° C ...
P. E. CHAMPNESS, P. GAY
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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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Olivine-liquid equilibrium [PDF]
Contributions to Mineralogy and Petrology, 1970 A number of experiments have been conducted in order to study the equilibria between olivine and basaltic liquids and to try and understand the conditions under which olivine will crystallize. These experiments were conducted with several basaltic compositions over a range of temperature (1150-1300 ° C) and oxygen fugacity (10-°.~s-10 -12 arm.) at one ...
Roeder, P. L., Emslie, R. F.
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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.
Maaløe, Sven, Hansen, Birger
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Olivine nodules in olivine nephelinite from Tokatoka, Northland [PDF]
New Zealand Journal of Geology and Geophysics, 1965 Abstract 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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An olivine-clinopyroxene geothermometer
Contributions to Mineralogy and Petrology, 1974The iron-magnesium exchange reaction between olivine and calcium-rich clinopyroxene is formulated as a geothermometer. It is shown that the clinopyroxene M1 site must be nonideal and it is expressed as a regular solution. The appropriate mixing parameters are calculated from a set of groundmass olivine-clinopyroxene pairs from lavas for which there are
Powell, Roger, Powell, Marjorie
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