Metanorite and Metadiorite

Gray-weathering, medium- to coarse-grained, massive to weakly foliated hornblende-orthopyroxene-plagioclase metanorite and medium- to fine-grained biotite-hornblende-plagioclase metadiorite. Occursas lenses and thin belts, commonly in proximity to garnet graphite paragneiss (Yp).
State Virginia
Name Metanorite and Metadiorite
Geologic age Proterozoic Y
Lithologic constituents
Major
Metamorphic > Metaigneous > Metaintrusive > Metadioriteinlcudes metanorite and metadiorite
Comments Blue Ridge Basement Complex, Middle Proterozoic (Grenville-Age) Plutonic Rocks
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 Loudoun