Ultramafic Rocks

Grayish-green to light-gray talc chlorite-actinolite or talc-tremolite schist. Mineralogy: (1) chlorite + actinolite + talc + dolomite + ilmenite + magnetite; (2) serpentine (antigorite) + talc + chlorite ± olivine ± augite; (3) tremolite + cummingtonite + chlorite + talc + magnetite-ilmenite ± quartz. Geophysical signature: elongate positive magnetic anomaly. Elongate, lenticular bodies generally trend parallel to schistosity of enclosing rocks and are concordant at variable stratigraphic levels within the Lynchburg Group.
State Virginia
Name Ultramafic Rocks
Geologic age Proterozoic Z-Cambrian
Lithologic constituents
Major
Igneous > Plutonic > Ultramaficnow metamorphosed
Metamorphic > Schist > Amphibole-schistnow metamorphosed to talc chlorite-actinolite or talc-tremolite schist
Comments Blue Ridge Anticlinorium (Central)
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 - Bedford - Campbell - Carroll - Culpeper - Fauquier - Floyd - Franklin - Grayson - Henry - Patrick - Pittsylvania - Lynchburg