单词	xenocryst
释义	xenocryst /ˈzɛnə(ʊ)krɪst / noun Geology A crystal in an igneous rock which is not derived from the original magma.This could represent a xenocryst derived from Archaean basement rocks of the region.... Again, the lack of zircon xenocrysts in this sample does not allow discrimination between these alternatives. The xenocrysts provide evidence that earlier Neoproterozoic rocks were present in the region and that locally rocks date back to 1929 Ma. Derivatives xenocrystic /zɛnə(ʊ)ˈkrɪstɪk/ adjective ... Many of the intrusions contain veins and irregular patches of xenocrystic hybrid rock and granite. There is also a subpopulation of subrounded xenocrystic zircons, which are slightly more brown than euhedral grains. These are interpreted as xenocrystic cores and are of a similar age to zircon analysed elsewhere in the Anatolide belt of western Turkey. Origin Late 19th century: from xeno- 'foreign' + crystal.
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