Results 241 to 250 of about 22,040 (302)

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.
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XENOLITHS AT THRELKELD, CUMBERLAND

Proceedings of the Yorkshire Geological Society, 1940
In the years 1925–6 I did a good deal of field-work on the so-called microgranite of Threlkeld and St. John’s Vale, with the intention of making a complete petrographic investigation of these rock masses. Material was collected and a number of microscope slices were cut.
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Farmington Meteorite: Cristobalite Xenoliths and Blackening

Science, 1967
The Farmington chondrite contains two small xenoliths of granular cristobalite, each surrounded by a thin reaction rim of diopsidic clinopyroxene. Similarities between the blackened structure and drusy cavities, characteristic of this meteorite, and those of an experimentally heat-treated chondrite suggest that Farmington was reheated rather than ...
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Mantle xenolith perspectives.

1987
There are records of approx 3500 basaltic xenolith localities and a similar number of kimberlitic occurrences, although actual figures are much greater. The xenoliths group into: spinel-bearing peridotites from alkali basalts from oceanic, circum-oceanic, and young continental (rift) regions; spinel-garnet peridotites from peralkaline basaltic rocks in
Nixon, P. H., Davies, G. R.
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Diamonds, Xenoliths, and Exploration Techniques

1991
Diamonds and ultramafic xenoliths found in lamproites represent samples of the mantle ocurring near, and overlying, the source rocks of these magmas. Despite their rarity, these samples contribute significantly to the economic and scientific importance of lamproites.
Roger H. Mitchell, Steven C. Bergman
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The Hyblean xenolith suite (Sicily): an unexpected legacy of the Ionian–Tethys realm

International journal of earth sciences, 2015
F. C. Manuella, V. Scribano, S. Carbone, A. Brancato   +3 more
semanticscholar   +1 more source

Inclusion Suites — Macrocrysts, Xenocrysts, Xenoliths, etc

1991
The spectrum between truly cognate and wholly foreign inclusions was explained in die introduction to Chapter 4. Here we deal widi inclusions which are largely foreign (Types B-F). Table 6.1 explains the fairly standard nomenclature used. Inclusions characteristically constitute tens of percent of the volume of individual lamprophyre dykes, and locally
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U-Pb age of rutile from the eclogite xenolith of the Udachnaya kimberlite pipe

Doklady earth sciences, 2014
A. Ragozin, D. Zedgenizov, V. S. Shatskii, Y. Orihashi, A. M. Agashev, H. Kagi   +5 more
semanticscholar   +1 more source

Mantle-derived guyanaite in a Cr-omphacitite xenolith from Moses Rock diatreme, Utah

, 2014
D. Schulze, R. Flemming, Patrick H.M. Shepherd, H. Helmstaedt   +3 more
semanticscholar   +1 more source

Heterogeneous magnesium isotopic composition of the lower continental crust: A xenolith perspective

, 2013
F. Teng, Wei Yang, R. Rudnick, Yan Hu
semanticscholar   +1 more source