Results 161 to 170 of about 2,520 (206)

Oxidation States of Fe in Constituent Minerals of a Spinel Lherzolite Xenolith from the Tariat Depression, Mongolia: The Significance of Fe3+ in Olivine

Minerals (Basel, Switzerland), 2018
The oxidation states of Fe within olivine, orthopyroxene, clinopyroxene, and spinel in a spinel lherzolite xenolith from the Tariat Depression, Mongolia were investigated using 57Fe Mössbauer spectroscopy to evaluate the redox condition of the upper
Yasuhito Osanai, Nobuhiko Nakano, Yoshiaki Kon   +2 more
exaly   +2 more sources

Xenolith evidence for lithospheric melting above anomalously hot mantle under the northern Canadian Cordillera

Contributions To Mineralogy and Petrology, 1998
A comparison of mantle xenolith suites along the northern Canadian Cordillera reveals that the xenoliths from three suites exhibit bimodal populations whereas the xenoliths from the other four suites display unimodal populations.
Andrew Frederiksen, Don Francis
exaly   +2 more sources

A year in the life of an aluminous metapelite xenolith—The role of heating rates, reaction overstep, H2O retention and melt loss

Lithos, 2011
Xenoliths of aluminous metapelite within the Platreef magmatic rocks of the Bushveld Complex, South Africa, are mineralogically and texturally zoned, with coarse-grained margins rich in acicular corundum, spinel and feldspar and cores rich in finer ...
Johnson, Tim, White, R., Brown, M.
exaly   +2 more sources

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The transport of xenoliths in magmas

Earth and Planetary Science Letters, 1977
Abstract Field measurements of the rheology of Hawaiian and Etnean lavas have shown that, on eruption, they behave as Bingham liquids with yield strengths in the range 70–450 N/m 2 . Ultramafic nodules entrained in a Bingham liquid cannot settle unless the stress they impose on the liquid exceeds approximately 5–7 times its yield strength ...
R.S.J. Sparks, H. Pinkerton, R. Macdonald   +2 more
openaire   +1 more source

The dynamics of xenolith assimilation

Contributions to Mineralogy and Petrology, 1998
Xenolith assimilation has been simulated with experiments involving melting wax spheres into hot water and aqueous solutions and characterised by a theoretical analysis. Both the cases of neutrally buoyant stationary spheres and spheres sinking through the hot host fluid are examined. Melt generated on a sphere's surface flows (compositional convection)
Mcleod, P, Sparks, RSJ
openaire   +1 more source

MANTLE XENOLITHS IN THE MATSOKU KIMBERLITE PIPE

Physics and Chemistry of the Earth, 1975
Abstract The chemical compositions of selected xenoliths from the Matsoku pipe and many constituent minerals are discussed. It is concluded that the xenoliths form a closely related suite of rocks of differing mineralogy and chemistry which could have been produced during a single igneous event in the mantle. It is likely that at solidus temperatures
J.J. Gurney, B. Harte, K.G. Cox
openaire   +1 more source

Xenoliths in Kimberlite

1980
Within kimberlite intrusions there are included fragments of a wide variety of rock types. Minerals derived from their fragmentation are incorporated into the host kimberlite, thereby giving it an extremely complex and hybrid mineralogy.
openaire   +1 more source

Potassium and rubidium in ultramafic xenoliths

Geochimica et Cosmochimica Acta, 1970
Abstract K and Rb contents of 13 ultramafic xenoliths and 6 specimens of associated basalt are presented. K Rb ratios of the xenoliths vary from about 60 to 600, while those of the hostbasalts lie in the narrower range of 200–340. Variation in the xenoliths may reflect mantle heterogeneity.
D.K. Paul, R. Hutchison
openaire   +1 more source

Fluid inclusions in mantle xenoliths

Lithos, 2001
Abstract Fluid inclusions in olivine and pyroxene in mantle-derived ultramafic xenoliths in volcanic rocks contain abundant CO2-rich fluid inclusions, as well as inclusions of silicate glass, solidified metal sulphide melt and carbonates. Such inclusions represent accidentally trapped samples of fluid- and melt phases present in the upper mantle, and
Tom Andersen, Else-Ragnhild Neumann
openaire   +1 more source

Southern African Kimberlites and their Xenoliths

1991
South African diamonds were found in primary kimberlite source rock in the late 1860’s and early 1870’s when Jagersfontein, Bultfontein, DeBeers, Dutoitspan, and other pipes near Kimberley (Fig. 1) were discovered in rapid succession (Wilson 1982; Janse 1984). Prior to this, stream gravels were the only diamond source worldwide.
J. J. Gurney, R. O. Moore, M. L. Otter, M. B. Kirkley, J. J. Hops, T. E. McCandless   +5 more
openaire   +1 more source