Lavas from the northwestern knoll are fresh, slightly ollvine-phyric lavas with abundant vesicles and rare, partially resorbed plagioclase xenocrysts
The dyke contains abundant large (up to at least 9 cm) phenocrysts and xenocrysts
in addition to a wide variety of xenoliths that include granulite, dunite, lherzolite, werhlite, harzburgite, and pyroxene peridotite (Ross et al.
Like garnets, chromite xenocrysts
are known to have formed co-genetically with diamonds.
Unit D is a relatively fresh, mostly dense but locally scoriaceous, porphyritic trachyandesite with ten to fifteen percent large plagioclase xenocrysts
It proves that the magma carried numerous mantle-derived xenocrysts
2004, Discovery of Archean continental and mantle fragments inferred from xenocrysts
in komatiites, the Belingwe greenstone belt, Zimbabwe: Geology, v.
minerals, including large chrome diopside xenocrysts
and abundant mantle
We consider the first interpretation to be the best explanation for the Brazil Lake tantalite U-Pb results because tantalite is generally quite rare in crustal rocks and it seems remote that there would be tantalite xenocrysts
originally present in the Brazil Lake magma.
The latter occurrence probably represent xenocrysts
Mantle xenoliths and xenocrysts
, brought to the surface by diamondiferous kimberlite pipes, provide a complex picture of distinct and stratified mantle domains (Kopylova et al.