Amphibole Metagabbro

Dark-greenish-gray, coarse grained, massive, hornblende metagabbro. Mineralogy: plagioclase + hornblende + biotite + clinopyroxene + quartz; relict olivine and myrmekitic intergrowths of quartz in other minerals are characteristic. Geophysical signature: small circular areas marked by positive magnetic anomalies. Metagabbro intrudes Ta River Metamorphic Suite.
State Virginia
Name Amphibole Metagabbro
Geologic age Cambrian
Lithologic constituents
Metamorphic > Metaigneous > Metaintrusive > Metagabbroamphiobole metagabbro
Comments Central Virginia Volcanic-Plutonic Belt

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 Spotsylvania - Stafford