A crystal in an igneous rock that 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.
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