Results 291 to 300 of about 66,103 (324)

Sintering of olivine and olivine-basalt aggregates [PDF]

open access: possiblePhysics 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
openaire   +1 more source

Oxidation of Olivines [PDF]

open access: possibleNature, 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
openaire   +1 more source

Olivines and olivine coronas in mesosiderites

Geochimica et Cosmochimica Acta, 1980
The 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
openaire   +2 more sources

Olivine-liquid equilibrium [PDF]

open access: possibleContributions 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.
openaire   +1 more source

Olivine phenocrysts of Hawaiian olivine tholeiite and oceanite

Contributions to Mineralogy and Petrology, 1982
Olivine 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
openaire   +2 more sources

Olivine nodules in olivine nephelinite from Tokatoka, Northland [PDF]

open access: possibleNew 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
openaire   +1 more source

Formation conditions of pyroxene-olivine and magnesian olivine chondrules

Geochimica et Cosmochimica Acta, 1990
Dynamic 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
openaire   +2 more sources

An olivine-clinopyroxene geothermometer

Contributions to Mineralogy and Petrology, 1974
The 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
openaire   +2 more sources

Antiferromagnetism in some olivines

2021
This thesis was scanned from the print manuscript for digital preservation and is copyright the author. Researchers can access this thesis by asking their local university, institution or public library to make a request on their behalf. Monash staff and postgraduate students can use the link in the References field.
openaire   +3 more sources

Zoning of phosphorus in igneous olivine

Contributions to Mineralogy and Petrology, 2008
We describe P zoning in olivines from terrestrial basalts, andesites, dacites, and komatiites and from a martian meteorite. P2O5 contents of olivines vary from below the detection limit (≤0.01 wt%) to 0.2–0.4 wt% over a few microns, with no correlated variations in Fo content.
John R. Beckett   +8 more
openaire   +5 more sources

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