Dale City Quartz Monzonite

Dale City Quartz Monzonite (Seiders and others, 1975). Medium- to light-gray, medium-grained, massive to well-foliated quartz monzonite, quartz monzodiorite, and subordinate quartz diorite. The Dale City intrudes the Chopawamsic Formation and is unconformably overlain by the Quantico Formation (Pavlides and others, 1980). The age is considered 560 Ma (discordant U-Th-Pb-zircon; Seiders and others, 1975).
State Virginia
Name Dale City Quartz Monzonite
Geologic age Cambrian
Lithologic constituents
Major
Igneous > Plutonic > Dioritic > Quartz-monzodiorite
Igneous > Plutonic > Syenitic > Quartz-monzonite
Comments Central Virginia Volcanic-Plutonic Belt
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 Prince William