xenolith

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Related to xenolithic: xenocryst, Autolith
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(geology) a piece of rock of different origin from the igneous rock in which it is embedded

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Total fusion analysis includes the radiogenic argon component of the entire sample in a single measurement and can mask internal variability and evidence of weathering and xenolithic contamination.
Outcrop-scale areas of gabbro within the Calais Quartz Diorite unit may be xenolithic or mingled material from the Staples Mountain and St.
Whether these "fragments" are phenocrysts crystallized directly from the kimberlite melt or xenolithic inclusions of other rock types was a question which went unresolved for some decades.
Several xenolithic bodies of Pretoria group quartzite and shale occur; the largest and most southerly of these masses dips at an angle of 50 [degrees] to 60 [degrees] towards the south.