Valley and Ridge Igneous Intrusions; Peridotite

Peridotite (Warren County, Rader and Biggs, 1976), chlorite, phlogopite, hydrobiotite pseudomorphs after olivine and pyroxene, pyrite, perovskite partly altered to leucoxene, apatite, dolomite, ilmenite, magnetite, epidote, and garnet. Kimberlite (Rockbridge County, Sears and Gilbert, 1973; Spencer, 1968), altered matrix montmorillonite, vermiculite, and chlorite; separated crystals Cr-rich spinel, clinopyroxene, garnet, ilmenite, rutile, anatase, zircon, and amphibole.
State Virginia
Name Valley and Ridge Igneous Intrusions; Peridotite
Geologic age Jurassic-Tertiary
Lithologic constituents
Major
Igneous > Plutonic > Ultramafic > PeridotiteDikes in Augusta and Rockingham Counties: nepheline syenite, teschenite-syenite, and teschenite-picrite.
Comments Appalachian Plateaus and Valley and Ridge
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 Rockbridge