Roseland Anorthosite

Roseland anorthosite (Ross, 1941; Herz and Force, 1987). White alkalic anorthosite contains andesine antiperthite megacrysts, blue quartz, and lesser orthopyroxene and rutile; cataclastic fabric is pervasive; dated at 1045 Ma (Sm-Nd whole-rock; Pettingill and others, 1984).
State Virginia
Name Roseland Anorthosite
Geologic age Proterozoic Y
Lithologic constituents
Major
Igneous > Plutonic > Anorthosite
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 Amherst - Nelson