autolith


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Related to autolith: xenolithic

autolith

[′ȯd·ō‚lith]
(petrology)
A fragment of igneous rock enclosed in another igneous rock of later consolidation, each being regarded as a derivative from a common parent magma.
A round, oval, or elongated accumulation of iron-magnesium minerals of uncertain origin in granitoid rock.
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The margin of the granite in the northwestern edge of the area also contains a similar dyke full of xenoliths ranging from grey to black fine- to medium- grained and mafic to dioritic in composition as well as autoliths of a porphyritic microgranitoid.
The autoliths are of granitic mode and consist of pink feldspar milky feldspar quartz and amphibole.