Metatonalite

Metatonalite (Pavlides, 1990). Leucocratic, fine grained, hypidiomorphic-granular, massive metatonalite-metaplagiogranite composed predominantly of sodic plagioclase and quartz, with minor potassium feldspar; plagioclase is variably altered to epidote and white mica. Thin cataclastic seams of quartz with white mica locally cut the rock.
State Virginia
Name Metatonalite
Geologic age Ordovician
Lithologic constituents
Major
Metamorphic > Metaigneous > Metaintrusive > MetatonaliteLeucocratic, fine grained, hypidiomorphic-granular, massive metatonalite-metaplagiogranite composed predominantly of sodic plagioclase and quartz, with minor potassium feldspar.
Comments Western Piedmont (Northern)
References

Virginia Division of Mineral Resources, 1993, Geologic Map of Virginia: Virginia Division of Mineral Resources, scale 1:500,000.

Virginia Division of Mineral Resources, 2003, Digital Representation of the 1993 Geologic Map of Virginia, Publication 174, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, scale 1:500,000.

NGMDB product
Counties Prince William