Results 171 to 180 of about 3,074 (215)

Lunar “dunite”, “pyroxenite” and “anorthosite”

Earth and Planetary Science Letters, 1972
Photomicrographic study of 200 thin sections of Apollo 14 rock samples suggests that these monomineralic aggregates are recrystallized single-mineral grains. It is contended, therefore, that the source rocks are not properly characterized by igneous rock names, being more moderately coarse-grained gabbroic rather than ultramafic rocks.
H WILSHIRE, E JACKSON
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Serpentine and dunite as magnesium fertiliser

New Zealand Journal of Agricultural Research, 1967
Abstract The uptake of magnesium by plants from the use of the magnesium silicates serpentine and dunite was compared with that from dolomite and talc‐magnesite, the latter two minerals being commonly used magnesium fertilisers in Nelson.
E. T. Chittenden, D. J. Stanton, J. Watson, K. J. Dodson   +3 more
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A DUNITE‐NORITE LUNAR MICROBRECCIA

Meteoritics, 1971
An olivine-rich microbreccia with noritic affinities, collected on the Apollo 14 mission to Fra Mauro, is described and analyzed. A photomicrograph (by plain transmitted light) of the microbreccia is discussed. One of three distinct areas on the microbreccia is shown to be a dunite containing over 90% olivine.
G. Jeffrey Taylor, Ursula B. Marvin
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Steelcasting nozzles of calcined dunite

Refractories, 1975
Dunite steelcasting nozzles were subjected to testing with melts of the entire range of steel grades produced by the Nizhne-Tagil Metallurgical Combine.
Zh. A. Vydrina, A. Ya. Nikoforov, V. G. Androsenko, A. A. Muratov, M. S. Leskin, S. P. Nekrasova, M. F. Lepskii   +6 more
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Dunite of the Ioko-Dovyrensk massif

Refractories, 1995
The dunite zone of the Ioko-Dovyrensk massif is 15 km long and 870 m thick. The dunites are fresh and possess physicochemical properties that make them a suitable raw material for the production of magnesiasilicate refractories. The weathering crust can be a source of molding sand.
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Comparison of Archean dunites and komatiites associated with nickel mineralisation in Western Australia: Implications for dunite genesis

Mineralium Deposita, 1986
The two important classes of Archean Fe-Ni-Cu sulphide deposits in Western Australia are those hosted by (1) coarse-grained adcumulate dunites (e.g. Agnew, Mount Keith) and (2) komatiitic lavas (e.g. Kambalda). Close similarities in compositions of relict olivine, pyroxene, and chromite from dunitic and komatiitic host rocks and compositional and ...
M.J. Donaldson, C.M. Lesher, D.I. Groves, J.J. Gresham   +3 more
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Notes on the dunite and the geochemistry of vermiculite at the Day Book dunite deposit, Yancey County, North Carolina

Economic Geology, 1954
The Day Book dunite deposit of western North Carolina is a well-exposed ultramafic body representative of dunite deposits in the southern Blue Ridge Province. It was intruded after regional metamorphism had begun, but prior to pegmatite invasion. At the contact of the ultramafic body with the country rock, there is a zone ranging in thickness from ...
John Laurence Kulp, Donald Albert Brobst
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Elasticity and anisotropy of dunite and bronzitite

Journal of Geophysical Research, 1972
Compressional and shear wave velocities in 13 directions at pressures to 10 kb were measured in dunite from the Twin Sisters peaks, Washington, and in bronzitite from the Stillwater Complex, Montana. Dunite is characterized by a strong preferred orientation of olivine grains, leading to anisotropy of velocity of 15% at 10 kb.
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High Temperature Flow of Dunite and Peridotite

Geological Society of America Bulletin, 1970
Deformation experiments on dunite and peridotite, both in the presence and absence of externally released H 2 O, have been carried out in solid pressure media apparatus in the confining pressure range 5 to 30 kb, temperature interval 300°C to 1400 ° C at constant strain rates ranging from 10 −3 to 10 −8 /sec. At the lower temperatures and higher rates,
NEVILLE L. CARTER, HANS G. AVE'LALLEMANT
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The platiniferous dunite pipes of the eastern Bushveld

Economic Geology, 1982
The platinum-group mineralogy of the platinum pipes has been well documented in recent years. The same, however, cannot be said for their silicate and oxide constituents. A microscopic study of mineralized and unmineralized dunites, hortonolite dunites, and dunite-bronzitites from the Onverwacht, Mooihoek, and Driekop pipes revealed the presence of one-
E. F. Stumpel, John C. Rucklidge
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